Supplementary Materials
|
|
- Gyles Hodge
- 6 years ago
- Views:
Transcription
1 Atomic layer-deposited tunnel oxide stabilizes silicon photoanodes for water oxidation Yi Wei Chen 1, Jonathan D. Prange 2, Simon Dühnen 2, Yohan Park 1, Marika Gunji 1, Christopher E. D. Chidsey 2, and Paul C. McIntyre 1* 1 Department of Materials Science & Engineering, Stanford University 2 Department of Chemistry, Stanford University These authors contributed equally to this work. * Corresponding author: pcm1@stanford.edu Supplementary Materials Experimental Methods Materials. All chemicals used in this study were purchased from commercial sources and used as received. Degenerately doped p + -type Si (100) wafers ( Ωcm, 500 m thickness) and n-type Si (100) wafers ( Ωcm, 500 m thickness) were purchased from El-Cat. All electrochemical measurements were performed in electrolyte solutions prepared with DI water. A ferri/ferrocyanide solution was made to be 10 mm of both K 3 Fe(CN) 6 and K 4 Fe(CN) 6 3H 2 O in 1 M aqueous KCl. Experiments for water electrolysis were performed in either acidic (1 M H 2 SO 4 ), neutral (1 M phosphate-buffered, ph 7) or basic (1 M NaOH) solutions. Sample Preparation. Atomic layer deposition (ALD) of TiO 2 was performed at 200 C on silicon wafers that were coated with a thin (< 2 nm) SiO 2 layer as prepared by the wafer vendor.. Tetrakisdmethylamido titanium (TDMAT) was used as the titanium source and water vapor as oxygen source. Each source was heated to a line temperature of 80 C. The system pressure was maintained at 1.1 Torr nominally, and nitrogen was used as the carrier gas. The pulse and purge durations of the titanium and water sources were 5 s and 0.75 s respectively. Unless stated otherwise, a total of 24 cycles of ALD NATURE MATERIALS 1
2 was performed to obtain a TiO 2 film of approximately 2 nm thickness. The noble metal layer was then deposited by e-beam evaporation with a quartz crystal balance used to monitor the thickness of material deposited to obtain the nanocomposite electrode. For all samples, a thin layer (3 nm) of metal was e-beam evaporated onto the backside of the silicon wafer (platinum for p + -Si samples and aluminum for n-si samples). This backside metal forms the electrical contact and eliminates any Schottky junctions that could be formed at the back of the substrate. Samples were annealed in forming gas (95% N 2, 5% H 2 ) at 400 C for 30 minutes in a quartz tube furnace before experiments were performed. Electronic tunneling mediated by the metallic overlayer. Efficient direct tunneling from the Si substrate through a thin TiO 2 layer requires sufficient density of states in the layer above TiO 2. A metal layer (e.g. Pt, Ir, Ru, etc ) has abundant density of states, and therefore, could sustain large tunneling current. The liquid electrolytes, however, have limited density of states, resulting in the low tunneling current when they are in direct contact with TiO 2. Therefore, the metal layer effectively mediates the charge transfer from Si and the reaction with the electrolyte. Other conductive catalysts, such as IrO 2, are also capable of serving the same role as the demonstrated metal catalyst layers, with details to be reported in future publications. Electrochemical Methods. All electrochemical experiments were performed on either a WaveNow or WaveNano potentiostat (Pine Research Instrumentation) in air at room temperature. A Pt wire was used as the counter electrode and a glass frit-isolated Ag/AgCl/sat. KCl electrode as the reference electrode. A 5 mm bored Teflon cone (area cm 2 ) was pressed against the DI water-rinsed nanocomposite working electrode. All measured potentials were converted to the NHE reference scale using E(NHE) = 2 NATURE MATERIALS
3 SUPPLEMENTARY INFORMATION E(Ag/AgCl/KCl) V. The ph values for the electrolyte solutions used in this study were determined by utilizing a reversible hydrogen electrode and measuring the open circuit potential for each solution and adjusting the ph dependent water oxidation potentials accordingly. Hydrogen gas was sparged into the electrolyte solutions for ten minutes, with a platinum rotating disc electrode as the working electrode and platinum mesh as the counter electrode. Cyclic voltammetry (CV). All CVs were measured, unless stated otherwise, at 100 mv/s in the indicated electrolyte solution. The open circuit potential (OCP) was measured before each experiment and used as the starting and ending potential for each CV. A peristaltic pump (Cole Parmer, Norprene tubing, ID = 1.6 mm) was used to continuously circulate electrolyte solution at a flow rate of 1 ml/s impinging on the sample in the bore of the Teflon cone for all dark and illuminated water electrolysis experiments (Figure S1 for dark, Figure S2 for illuminated). CV s obtained with solar illumination on n-si anodes were performed in static solutions without pumping. A modified pumping configuration with the electrolyte flow entering through an angled hole in the side of the bore of the Teflon cone was used for stability tests conducted under solar illumination so as not to block the light with the delivery tube (Figure S2). Table S1 lists the peak-to-peak splitting for the ferri/ferrocyanide solution for different anode structures. Impedance spectroscopy measurements. Impedance spectroscopy was performed on a Princeton Applied Science impedance spectrometer to determine the solution resistance of the electrolytes used in this study. The Nyquist plots for the acidic, neutral and basic electrolyte solutions are shown in Figure S3. Extrapolation of the NATURE MATERIALS 3
4 Nyquist plots to large frequencies reveals series resistance to be 7.5 Ω, 33.5 Ω and 15 Ω for the acidic, neutral and basic solutions respectively. The obtained series resistance values correspond to theoretical calculations very well. As an example, the resistivity of 1 M NaOH is 5.9 cm (by linear extrapolation). By using a cylindrical geometry of 5 mm height and 5 mm diameter, the calculated resistance is 15. Chronoamperometry. Chronoamperometry experiments were performed by holding the potential at 1.5 V vs. Ag/AgCl/KCl reference electrode and monitoring the current over time in 10 ml of the specified electrolyte solution. The electrolyte solution was circulated with the peristaltic pump as described above. Results for a 18 hour experiment in neutral solution without illumination are shown in Figure S4 below. Chronopotentiometry (CP). All CP experiments were performed by holding the current constant at 1 ma across a cm 2 anode surface area while monitoring the potential over time in 10 ml of the specified electrolyte solution. The electrolyte solution was circulated with the peristaltic pump using the procedure described above. Diffusion-limited current. To understand the discrepancy between the expected current density values obtained by extrapolation of the measured Tafel slopes at low current density and the measured values obtained during CP and CA experiments, diffusion-limited currents were estimated by determining the limiting current for ferrocyanide oxidation under identical flow conditions and then adjusting that value for the concentrations and the published diffusion constants of the different species that might limit mass transfer during water oxidation: either transport of the reactants (H 2 O or OH - ) to the surface or transport of the products (O 2 and H + or H 2 O) away from the surface. The analysis showed that with a flow rate of 1 ml/s, mass transfer of the 4 NATURE MATERIALS
5 SUPPLEMENTARY INFORMATION reactants to the surface should not be limiting, with achievable current densities beyond the solar flux limitations at 1 sun illumination. However, a major discrepancy was found for mass transport of the sparingly soluble product of water oxidation, O 2, away from the electrode surface. Under the fastest flow rates possible in our cell, 2 ml/s, oxygen bubbles would be expected to form at current densities of a few ma/cm 2. Because the current distribution is not expected to be uniform when mass transport is limiting in this flow arrangement, we expect that bubbles form when the average current density is of the order 1 ma/cm 2. These bubbles should effectively decrease the catalytic surface area and thus reduce the total current at a specific overpotential relative to that expected by extrapolation of the Tafel slope measured at low current density. Temperature dependent tunneling experiments. Temperature dependent tunneling experiments were performed on Ir/TiO 2 /p + -Si electrodes. Three thicknesses (2 nm, 4 nm, and 10 nm) of TiO 2 were chosen to observe the thickness-dependent tunneling behavior. A shadow mask is used to define the circular top metal contacts of 100 m diameter. The thickness of Ir top metal contact is 50 nm. The substrate bias was scanned from 0 to 1 V while monitoring the current density, as shown in Figure S5. Transmission electron microscopy of Ir/TiO 2 /p + -Si anode after stability test. Cross-sectional TEM was conducted after the 3 hr CP stability test (constant current at 5 ma/cm 2 ) for the Ir/TiO 2 /p + -Si sample (Figure S6). Comparing Figure S6 with Figure 1B, it is evident that cross-sectional TEM images detect no apparent structural change in the TiO 2 -protected anodes after the life test. X-ray photoelectron spectroscopy (XPS). The XPS measurements were performed using a PHI VersaProbe system with a 100 W Al-Kα X-ray source on a spot NATURE MATERIALS 5
6 size of 100 µm at a 45 incident angle. The binding energy scan range was ev in 1 ev steps, and the pass energy was ev, which provides the optimal balance between scan resolution and counting statistics in our system. A dual beam neutralizer (7 V Ar + and 30 V electron beam) was used to neutralize sample charging. XPS depth profiling was performed using an Ar + ion beam at 2 kv and 1 A with an area of 2x2 cm. Spectra were collected at intervals of 3 s during sputtering. Atomic Force Microscopy (AFM). The AFM images for these samples were acquired using a Park XE-70 instrument set on a non-contact tapping mode with a scan rate of 1 Hz. A representative AFM image of the nanocomposite anode after synthesis is shown in Figure S9. Figure S1. Electrochemical cell setup without illumination. Crosssectional schematic of experimental setup utilized for dark electrochemical experiments on Ir/TiO 2 /p + -Si anodes. 6 NATURE MATERIALS
7 SUPPLEMENTARY INFORMATION Figure S2. Electrochemical cell setup with illumination. Crosssectional schematic of experimental setup utilized for stability tests with n-si/tio 2 /Ir under solar illumination. This geometry allows for unobstructed illumination of the sample. NATURE MATERIALS 7
8 8 NATURE MATERIALS
9 SUPPLEMENTARY INFORMATION Figure S3. Impedance spectroscopy of aqueous solutions. Nyquist plots from series resistance measurements from (A) acidic, (B) neutral and (C) basic solutions measured from 300 khz to 0.1 Hz. Figure S4. Chronoamperometry in neutral solution. Constant potential measurement at 1.5 V vs. Ag/AgCl/sat. KCl in ph 7 buffered solution without illumination for 18 hours for Ir/p + -Si ( ) and Ir/TiO 2 /p + -Si (-). NATURE MATERIALS 9
10 Figure S5. Temperature dependent tunneling current measurement for the Ir/TiO 2 /p + -Si electrode. The ALD-grown TiO 2 thicknesses were (A) 2 nm, (B) 4 nm, and (C) 10 nm. Measurements were taken at (-) 23 o C, (-) 50 o C, and (-) 75 o C. The line (-) indicates the compliance of the meter. 10 NATURE MATERIALS
11 SUPPLEMENTARY INFORMATION Figure S6. Cross-sectional TEM image of Ir/TiO 2 /p + -Si anode. Taken after 3 hr constant current (5 ma on a sample area of cm 2 ) stability test. NATURE MATERIALS 11
12 Figure S7. Equilibrium band diagrams. (A) Ir/TiO 2 /p + -Si and (B) Ir/TiO 2 /n-si anode in contact with ferrocyanide solution. It is assumed that the redox level of the solution equilibrates with the Ir metal catalyst. 12 NATURE MATERIALS
13 SUPPLEMENTARY INFORMATION Figure S8. Light saturated current density. Cyclic voltammogram of Ir/TiO 2 /n-si in 1M H 2 SO 4 under simulated solar illumination at 1 sun. Scan rate is 0.1 V/s NATURE MATERIALS 13
14 Figure S9. AFM image of Ir covered ALD-TiO 2 sample. Root-mean-square roughness ~0.2 nm 14 NATURE MATERIALS
15 SUPPLEMENTARY INFORMATION Table S1. Summary of peak-to-peak potential separation for anodes measured in ferri/ferrocyanide solution Substrate E anodic to E cathodic (mv) TiO 2 /Si No observable peaks Ir/TiO 2 /Si 130 Indium Tin Oxide a 220 a Delta Technologies, Product # CB-40IN-S211, 4-8 Ω/ with a small area, front-side electrical contact outside the Teflon cone perhaps inducing a series resistance that accounts for the larger peak-to-peak separation. NATURE MATERIALS 15
Supplementary Information. Atomic Layer Deposition of Platinum Catalysts on Nanowire Surfaces for Photoelectrochemical Water Reduction
Supplementary Information Atomic Layer Deposition of Platinum Catalysts on Nanowire Surfaces for Photoelectrochemical Water Reduction Neil P. Dasgupta 1 ǂ, Chong Liu 1,2 ǂ, Sean Andrews 1,2, Fritz B. Prinz
More informationSupporting Information:
Supporting Information: Enhancing Visible Light Photo-Oxidation of Water with TiO 2 Nanowire Arrays via Co-treatment with H 2 and NH 3 : Synergistic Effects between Ti 3+ and N. Son Hoang, Sean P. Berglund,
More informationEnhances Photoelectrochemical Water Oxidation
-Supporting Information- Exposure of WO 3 Photoanodes to Ultraviolet Light Enhances Photoelectrochemical Water Oxidation Tengfei Li, Jingfu He, Bruno Peña, Curtis P. Berlinguette* Departments of Chemistry
More informationA Robust and Highly Active Copper-Based Electrocatalyst. for Hydrogen Production at Low Overpotential in Neutral
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2015 Supporting information A Robust and Highly Active Copper-Based Electrocatalyst for Hydrogen Production
More informationElectronic Supplementary Information: Synthesis and Characterization of Photoelectrochemical and Photovoltaic Cu2BaSnS4 Thin Films and Solar Cells
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry C. This journal is The Royal Society of Chemistry 2017 Electronic Supplementary Information: Synthesis and Characterization of
More informationnm
Efficient solar water-splitting using a nanocrystalline CoO photocatalyst Longb Liao, Qiuhui Zhang, Zhihua Su, Zhongzheng Zhao, Yanan Wang, Yang Li, Xiaoxiang Lu, Dongguang Wei, Guoying Feng, Qingkai Yu,
More informationElectronic Supplementary Information
Electronic Supplementary Information High Electrocatalytic Activity of Self-standing Hollow NiCo 2 S 4 Single Crystalline Nanorod Arrays towards Sulfide Redox Shuttles in Quantum Dot-sensitized Solar Cells
More informationSupporting Information. Electropolymerization of aniline on nickel-based electrocatalysts substantially
Supporting Information Electropolymerization of aniline on nickel-based electrocatalysts substantially enhances their performance for hydrogen evolution Fuzhan Song, Wei Li, Guanqun Han, and Yujie Sun*
More informationSupplementary Information. Carolyn Richmonds, Megan Witzke, Brandon Bartling, Seung Whan Lee, Jesse Wainright,
Supplementary Information Electron transfer reactions at the plasma-liquid interface Carolyn Richmonds, Megan Witzke, Brandon Bartling, Seung Whan Lee, Jesse Wainright, Chung-Chiun Liu, and R. Mohan Sankaran*,
More informationElectronic Supplementary Material (ESI) for Chemical Communications This journal is The Royal Society of Chemistry 2011
Supplementary Information for Selective adsorption toward toxic metal ions results in selective response: electrochemical studies on polypyrrole/reduced graphene oxide nanocomposite Experimental Section
More informationInterdisciplinary Graduate School, Nanyang Technological University, Singapore , Singapore.
Electronic Supplementary Material (ESI) for Nanoscale. This journalelectronic is TheSupplementary Royal Society Information of Chemistry (ESI) for 2014 Nanoscale. Triple-layer nanostructured WO 3 photoanodes
More informationSupporting Information
Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2014 Engineering Cu 2 O/NiO/Cu 2 MoS 4 Hybrid Photocathode for H 2 Generation in Water Chen Yang, a,b
More informationPhotocathode for Water Electrolysis Applications
Supporting Information Efficient and Stable Pt/TiO 2 /CdS/Cu 2 BaSn(S,Se) 4 Photocathode for Water Electrolysis Applications Yihao Zhou 1#, Donghyeop Shin 1,2,4#, Edgard Ngaboyamahina 3#, Qiwei Han 1,2,
More informationSupporting Information
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2017 Supporting Information Experimental section Synthesis of Ni-Co Prussian
More informationElectronic Supplementary Information
Electronic Supplementary Material (ESI) for Chemical Communications. This journal is The Royal Society of Chemistry 2015 Electronic Supplementary Information Phosphorus-Doped CoS 2 Nanosheet Arrays as
More informationSupporting Information:
Supporting Information: High Efficiency Photoelectrocatalytic Hydrogen Generation Enabled by Palladium Quantum Dots Sensitized TiO 2 Nanotube Arrays Meidan Ye, Jiaojiao Gong, Yuekun Lai, Changjian Lin,*,
More informationNanomaterials and Chemistry Key Laboratory, Wenzhou University, Wenzhou, (P. R. China).
Electronic Supplementary Material (ESI) for Nanoscale Synergistically enhanced activity of graphene quantum dot/multi-walled carbon nanotube composites as metal-free catalysts for oxygen reduction reaction
More informationSupporting Information
Supporting Information High Performance Electrocatalyst: Pt-Cu Hollow Nanocrystals Xiaofei Yu, a Dingsheng, a Qing Peng a and Yadong Li* a a Department of Chemistry, Tsinghua University, Beijing, 100084
More informationDepartment of Chemical, Materials and Biomolecular Engineering, University of Connecticut, 191
High Stability, High Activity Pt/ITO Oxygen Reduction Electrocatalysts Ying Liu and William E. Mustain* Department of Chemical, Materials and Biomolecular Engineering, University of Connecticut, 191 Auditorium
More informationCarbon Quantum Dots/NiFe Layered Double Hydroxide. Composite as High Efficient Electrocatalyst for Water
Supplementary Information Carbon Quantum Dots/NiFe Layered Double Hydroxide Composite as High Efficient Electrocatalyst for Water Oxidation Di Tang, Juan Liu, Xuanyu Wu, Ruihua Liu, Xiao Han, Yuzhi Han,
More informationSupplementary Information
Supplementary Information Supplementary Figures Supplementary Figure S1. Change in open circuit potential ( OCP) of 1% W-doped BiVO 4 photoanode upon illumination with different light intensities. Above
More informationHigh-resolution on-chip supercapacitors with ultra-high scan rate ability
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 214 Supporting Information High-resolution on-chip supercapacitors with ultra-high
More informationN-doped Carbon-Coated Cobalt Nanorod Arrays Supported on a Titanium. Mesh as Highly Active Electrocatalysts for Hydrogen Evolution Reaction
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2014 Electronic Supplementary Information N-doped Carbon-Coated Cobalt Nanorod
More informationTunable nitrogen-doped carbon aerogels as sustainable electrocatalysts in the oxygen. reduction reaction Electronic Supplementary information (ESI)
Tunable nitrogen-doped carbon aerogels as sustainable electrocatalysts in the oxygen reduction reaction Electronic Supplementary information (ESI) Stephanie-Angelika Wohlgemuth,* a Tim-Patrick Fellinger
More informationSupporting Information. Electrochemical Vapor Deposition (E-CVD) of Semiconductors from Gas. Phase with a Solid Membrane Cell
Supporting Information Electrochemical Vapor Deposition (E-CVD) of Semiconductors from Gas Phase with a Solid Membrane Cell Sung Ki Cho 1, Fu-Ren F. Fan, and Allen J. Bard * Center for Electrochemistry,
More information3D Boron doped Carbon Nanorods/Carbon-Microfiber Hybrid Composites: Synthesis and Applications as Highly Stable Proton Exchange Membrane Fuel Cell
Electronic Supplementary Information for Journal of Materials Chemistry 3D Boron doped Carbon Nanorods/Carbon-Microfiber Hybrid Composites: Synthesis and Applications as Highly Stable Proton Exchange Membrane
More informationDivision of Physics and Semiconductor Science, Dongguk University, Seoul 04620, South Korea
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2017 Supplementary information for Self-assembled Two-dimensional Copper Oxide
More informationREFRACTORY METAL OXIDES: FABRICATION OF NANOSTRUCTURES, PROPERTIES AND APPLICATIONS
REFRACTORY METAL OXIDES: FABRICATION OF NANOSTRUCTURES, PROPERTIES AND APPLICATIONS S.K. Lazarouk, D.A. Sasinovich BELARUSIAN STATE UNIVERSITY OF INFORMATICS AND RADIOELECTRONICS Outline: -- experimental
More informationLithium-ion Batteries Based on Vertically-Aligned Carbon Nanotubes and Ionic Liquid
Electronic Supplementary Information Lithium-ion Batteries Based on Vertically-Aligned Carbon Nanotubes and Ionic Liquid Electrolytes Wen Lu, * Adam Goering, Liangti Qu, and Liming Dai * 1. Synthesis of
More informationBoron-doped graphene as high-efficiency counter electrode for dye-sensitized solar cells
Electronic Supplementary Information Boron-doped graphene as high-efficiency counter electrode for dye-sensitized solar cells Haiqiu Fang #, Chang Yu #, Tingli Ma, and Jieshan Qiu* Carbon Research Laboratory,
More informationAn extraordinarily stable catalyst: Pt NPs supported on two-dimensional Ti 3 C 2 X 2 (X=OH, F) nanosheets for Oxygen Reduction Reaction
An extraordinarily stable catalyst: Pt NPs supported on two-dimensional Ti 3 X 2 (X=OH, F) nanosheets for Oxygen Reduction Reaction Xiaohong Xie, Siguo Chen*, Wei Ding, Yao Nie, and Zidong Wei* Experimental
More informationELECTROCATALYSIS OF THE HYDROGEN-EVOLUTION REACTION BY ELECTRODEPOSITED AMORPHOUS COBALT SELENIDE FILMS
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2014 Supplementary Information for: ELECTROCATALYSIS OF THE HYDROGEN-EVOLUTION
More informationSupporting Information for. Selectivity and Activity in Catalytic Methanol Oxidation in the Gas Phase
1 / 5 Supporting Information for The Influence of Size-Induced Oxidation State of Platinum Nanoparticles on Selectivity and Activity in Catalytic Methanol Oxidation in the Gas Phase Hailiang Wang, Yihai
More informationAchieving Stable and Efficient Water Oxidation by Incorporating NiFe. Layered Double Hydroxide Nanoparticles into Aligned Carbon.
Electronic Supplementary Material (ESI) for Nanoscale Horizons. This journal is The Royal Society of Chemistry 2015 Achieving Stable and Efficient Water Oxidation by Incorporating NiFe Layered Double Hydroxide
More informationAchieving High Electrocatalytic Efficiency on Copper: A Low-Cost Alternative to Platinum for Hydrogen Generation in Water
Supporting Information Achieving High Electrocatalytic Efficiency on Copper: A Low-Cost Alternative to Platinum for Hydrogen Generation in Water Jian Zhao, a,b,c,d Phong D. Tran,* a,c Yang Chen, a,c Joachim
More informationHigh-Flux CO Reduction Enabled by Three-Dimensional Nanostructured. Copper Electrodes
Supporting Information High-Flux CO Reduction Enabled by Three-Dimensional Nanostructured Copper Electrodes Yuxuan Wang, David Raciti, Chao Wang * Department of Chemical and Biomolecular Engineering, Johns
More informationTemplated electrochemical fabrication of hollow. molybdenum sulfide micro and nanostructures. with catalytic properties for hydrogen production
Supporting Information Templated electrochemical fabrication of hollow molybdenum sulfide micro and nanostructures with catalytic properties for hydrogen production Adriano Ambrosi, Martin Pumera* Division
More informationSupporting Information
Copyright WILEY-VCH Verlag GmbH & Co. KGaA, 69469 Weinheim, Germany, 2017. Supporting Information for Adv. Energy Mater., DOI: 10.1002/aenm.201701456 Selective Etching of Nitrogen-Doped Carbon by Steam
More informationVI. EIS STUDIES LEAD NANOPOWDER
VI. EIS STUDIES LEAD NANOPOWDER 74 26. EIS Studies of Pb nanospheres Impedance (valid for both DC and AC), a complex resistance occurs when current flows through a circuit (composed of various resistors,
More informationNickel Phosphide-embedded Graphene as Counter Electrode for. Dye-sensitized Solar Cells **
Nickel Phosphide-embedded Graphene as Counter Electrode for Dye-sensitized Solar Cells ** Y. Y. Dou, G. R. Li, J. Song, and X. P. Gao =.78 D 1359 G 163 a =.87 D 138 G 159 b =1.3 D 1351 G 1597 c 1 15 1
More informationConductance and capacitance of bilayer protective oxides for silicon water splitting anodes
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2015 Conductance and capacitance of bilayer protective oxides for silicon water
More informationSupporting Information
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2018 Supporting Information A Cu 2 Se-Cu 2 O Film Electrodeposited on Titanium Foil as a Highly Active
More informationNickel Sulfides Freestanding Holey Films as Air-Breathing Electrodes for. Flexible Zn-Air Batteries
Nickel Sulfides Freestanding Holey Films as Air-Breathing Electrodes for Flexible Zn-Air Batteries Kyle Marcus, 1,# Kun Liang, 1,# Wenhan Niu, 1,# Yang Yang 1,* 1 NanoScience Technology Center, Department
More informationSupporting information
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2014 Supporting information Synthesis, Characterization and Photoelectrochemical properties of HAP Gang
More informationElectronics Supplementary Information for. Manab Kundu, Cheuk Chi Albert Ng, Dmitri Y. Petrovykh and Lifeng Liu*
Electronics Supplementary Information for Nickel foam supported mesoporous MnO 2 nanosheet arrays with superior lithium storage performance Manab Kundu, Cheuk Chi Albert Ng, Dmitri Y. Petrovykh and Lifeng
More informationDual redox catalysts for oxygen reduction and evolution reactions: towards a redox flow Li-O 2 battery
Electronic Supplementary Material (ESI) for Chemical Communications. This journal is The Royal Society of Chemistry 2015 Supporting Information Dual redox catalysts for oxygen reduction and evolution reactions:
More informationElectronic supplementary information. Amorphous carbon supported MoS 2 nanosheets as effective catalyst for electrocatalytic hydrogen evolution
Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2014 Electronic supplementary information Amorphous carbon supported MoS 2 nanosheets as effective
More informationSupplementary Figures
Supplementary Figures Supplementary Figure 1. AFM profiles of the charge transport and perovskite layers. AFM Image showing the thickness (y axis) of the layer with respect to the horizontal position of
More informationFig. S1 The Structure of RuCE(Left) and RuCA (Right)
Supporting information Fabrication of CZTS and CZTSSe photocathode CZTS photocathode was fabricated by sulfurization of a stacked film containing Cu, Zn and Sn. The stacked film was fabricated on Mo coated
More informationNitrogen and sulfur co-doped porous carbon derived from human hair as. highly efficient metal-free electrocatalyst for hydrogen evolution reaction
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2015 Electronic Supplementary Information Nitrogen and sulfur co-doped porous
More informationSupporting Information
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2014 Supporting Information Efficient Photoelectrochemical Water Splitting of
More informationDEPOSITION OF THIN TiO 2 FILMS BY DC MAGNETRON SPUTTERING METHOD
Chapter 4 DEPOSITION OF THIN TiO 2 FILMS BY DC MAGNETRON SPUTTERING METHOD 4.1 INTRODUCTION Sputter deposition process is another old technique being used in modern semiconductor industries. Sputtering
More informationSupporting Information. Nature of Activated Manganese Oxide for Oxygen Evolution
Supporting Information Nature of Activated Manganese Oxide for Oxygen Evolution Michael Huynh, a Chenyang Shi, b Simon J. L. Billinge, b,c Daniel G. Nocera*,a adepartment of Chemistry and Chemical Biology,
More informationSupplementary Figure 1. Characterization of immobilized cobalt protoporphyrin electrode. The cyclic voltammogram of: (a) pyrolytic graphite
Supplementary Figure 1. Characterization of immobilized cobalt protoporphyrin electrode. The cyclic voltammogram of: (a) pyrolytic graphite electrode; (b) pyrolytic graphite electrode with 100 µl 0.5 mm
More informationSupplementary Information
Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is The Royal Society of Chemistry 2017 Supplementary Information The electrochemical discrimination of pinene enantiomers by
More informationSupporting Information
Supporting Information Copyright Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, 2010 Fluoride-Modulated Cobalt Catalysts for Electrochemical Oxidation of Water under Non-Alkaline Conditions James B.
More informationSupporting information:
Supporting information: The Role of Anisotropic Structure and Its Aspect Ratio: High-Loading Carbon Nanospheres Supported Pt Nanowires and Their High Performance Toward Methanol Electrooxidation Feng-Zhan
More informationNanoporous metals by dealloying multicomponent metallic glasses. Chen * Institute for Materials Research, Tohoku University, Sendai , Japan
Supporting information for: Nanoporous metals by dealloying multicomponent metallic glasses Jinshan Yu, Yi Ding, Caixia Xu, Akihisa Inoue, Toshio Sakurai and Mingwei Chen * Institute for Materials Research,
More informationSingle Catalyst Electrocatalytic Reduction of CO 2 in Water to H 2 :CO Syngas Mixtures with Water Oxidation to O 2
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2014 Supporting Information Single Catalyst Electrocatalytic Reduction of CO 2
More informationSupplementary Information for
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2017 Supplementary Information for Cu Nanowires Shelled with NiFe Layered Double
More informationSupporting Information. High Wettable and Metallic NiFe-Phosphate/Phosphide Catalyst Synthesized by
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2018 Supporting Information High Wettable and Metallic NiFe-Phosphate/Phosphide
More informationTemperature Dependent Current-voltage Characteristics of P- type Crystalline Silicon Solar Cells Fabricated Using Screenprinting
Temperature Dependent Current-voltage Characteristics of P- type Crystalline Silicon Solar Cells Fabricated Using Screenprinting Process Hyun-Jin Song, Won-Ki Lee, Chel-Jong Choi* School of Semiconductor
More informationImpact of Silicon Resistivity on the Performance of Silicon Photoanode for Efficient Water Oxidation Reaction
Supporting Information Impact of Silicon Resistivity on the Performance of Silicon Photoanode for Efficient Water Oxidation Reaction Qian Cai, Wenting Hong, Chuanyong Jian, Jing Li, Wei Liu* Key Laboratory
More informationElectronic Supplementary Information for: 3D-Printed Plastic Components Tailored for Electrolysis
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information for: 3D-Printed Plastic Components Tailored
More informationSieving Behaviour of Nanoscopic Pores by. Hydrated Ions
Sieving Behaviour of Nanoscopic Pores by Hydrated Ions Joohan Lee a and Juhyoun Kwak* a Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu,
More informationThe interfacial study on the Cu 2 O/Ga 2 O 3 /AZO/TiO 2 photocathode for water splitting fabricated by pulsed laser deposition
Electronic Supplementary Material (ESI) for Catalysis Science & Technology. This journal is The Royal Society of Chemistry 2017 The interfacial study on the Cu 2 O/Ga 2 O 3 /AZO/TiO 2 photocathode for
More informationSupporting Information
Supporting Information Wiley-VCH 2012 69451 Weinheim, Germany Molybdenum Boride and Carbide Catalyze Hydrogen Evolution in both Acidic and Basic Solutions** Heron Vrubel and Xile Hu* anie_201207111_sm_miscellaneous_information.pdf
More informationThe Role of Hydrogen in Defining the n-type Character of BiVO 4 Photoanodes
Supporting Information The Role of Hydrogen in Defining the n-type Character of BiVO 4 Photoanodes Jason K. Cooper, a,b Soren B. Scott, a Yichuan Ling, c Jinhui Yang, a,b Sijie Hao, d Yat Li, c Francesca
More informationA super-efficient cobalt catalyst for electrochemical hydrogen production from neutral water with 80 mv overpotential
Supporting Information for A super-efficient cobalt catalyst for electrochemical hydrogen production from neutral water with 8 mv overpotential Lin Chen, a Mei Wang, *a Kai Han, a Peili Zhang, a Frederic
More informationSupplementary Information:
Supplementary Information: One-Step and Rapid Synthesis of Clean and Monodisperse Dendritic Pt Nanoparticles and Their High Performance Toward Methanol Oxidation and p-nitrophenol Reduction Jun Wang, Xin-Bo
More informationSupporting Information
Supporting Information Wiley-VCH 2013 69451 Weinheim, Germany 3D Honeycomb-Like Structured Graphene and Its High Efficiency as a Counter-Electrode Catalyst for Dye-Sensitized Solar Cells** Hui Wang, Kai
More informationSupplementary Information 1. Enhanced Solar Absorption, Visible-Light Photocatalytic and. Photoelectrochemical Properties of Aluminium-reduced
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2017 Supplementary Information to Enhanced Solar Absorption, Visible-Light Photocatalytic and Photoelectrochemical
More informationSupporting Information. Effects of Environmental Water Absorption by. Film Transistor Performance and Mobility
Supporting Information Effects of Environmental Water Absorption by Solution-Deposited Al 2 O 3 Gate Dielectrics on Thin Film Transistor Performance and Mobility Trey B. Daunis, James M. H. Tran, and Julia
More informationElectronic Supplementary Information
Electronic Supplementary Information Uniform and Rich Wrinkled Electrophoretic Deposited Graphene Film: A Robust Electrochemical Platform for TNT Sensing Longhua Tang, Hongbin Feng, Jinsheng Cheng and
More informationSupporting Information
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2015 Supporting Information 1. Synthesis of perovskite materials CH 3 NH 3 I
More informationSupplementary Materials for
advances.sciencemag.org/cgi/content/full/3/3/e1602215/dc1 Supplementary Materials for Bulk layered heterojunction as an efficient electrocatalyst for hydrogen evolution Changdeuck Bae, Thi Anh Ho, Hyunchul
More informationCorrelating Hydrogen Evolution Reaction Activity in Alkaline Electrolyte to Hydrogen Binding Energy on Monometallic Surfaces
Supplemental Materials for Correlating Hydrogen Evolution Reaction Activity in Alkaline Electrolyte to Hydrogen Binding Energy on Monometallic Surfaces Wenchao Sheng, a MyatNoeZin Myint, a Jingguang G.
More informationElectronic Supplementary Information (ESI )
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2014 Electronic Supplementary Information (ESI ) Hollow nitrogen-doped carbon spheres as an efficient
More informationSupporting Information
Supporting Information Oxygen Reduction on Graphene-Carbon Nanotube Composites Doped Sequentially with Nitrogen and Sulfur Drew C. Higgins, Md Ariful Hoque, Fathy Hassan, Ja-Yeon Choi, Baejung Kim, Zhongwei
More informationMAE 214 FUEL CELL FUNDAMENTALS & TECHNOLOGY FC ANALYSES TECHNIQUES
MAE 214 FUEL CELL FUNDAMENTALS & TECHNOLOGY Fuel Cell Analyses Methods NFCRC DR. JACK BROUWER MAE 214 Lecture #11 Spring, 2005 FC ANALYSES TECHNIQUES Potential Sweep Methods Linear Sweep Voltammetry (I-V)
More informationSupporting Information (SI): Revised Oxygen Evolution Reaction Activity Trends for First- Row Transition Metal (Oxy)hydroxides in Alkaline Media
Supporting Information (SI: Revised Oxygen Evolution Reaction Activity Trends for First- Row Transition Metal (Oxyhydroxides in Alkaline Media Michaela S. Burke, Shihui Zou, Lisa J. Enman, Jaclyn E. Kellon,
More informationof (002) plane on the surfaces of porous N-doped carbon nanotubes for
Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information Growth of MoSe 2 nanosheet arrays with small size and expanded
More informationElectronic Supplementary Information. Experimental details graphene synthesis
Electronic Supplementary Information Experimental details graphene synthesis Graphene is commercially obtained from Graphene Supermarket (Reading, MA, USA) 1 and is produced via a substrate-free gas-phase
More informationSupplementary File. Nanoparticle Silver Catalysts That Show Enhanced Activity For Carbon Dioxide Electrolysis
Supplementary File Nanoparticle Silver Catalysts That Show Enhanced Activity For Carbon Dioxide Electrolysis Amin Salehi-Khojin a,b *, Huei-Ru Molly Jhong c, Brian A. Rosen a,c,, Wei Zhu a, Sichao Ma c,
More informationElectronic Supplementary Information (ESI)
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information (ESI) Synthesis of 1T-MoSe 2 ultrathin
More informationElectronic Supplementary Information
Electronic Supplementary Material (ESI) for Chemical Science. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information Precious-metal free photoelectrochemical water splitting
More informationSupplementary Information
Supplementary Information Visible Photocatalytic Water Splitting and Photocatalytic Two-Electron Oxygen Formation over Cu and Fe Doped g-c 3 N 4 Zhen Li a,b, Chao Kong a,b, Gongxuan Lu a* a State Key Laboratory
More informationSupporting Information Reagents. Physical methods. Synthesis of ligands and nickel complexes.
Supporting Information for Catalytic Water Oxidation by A Bio-inspired Nickel Complex with Redox Active Ligand Dong Wang* and Charlie O. Bruner Department of Chemistry and Biochemistry and Center for Biomolecular
More informationLow temperature anodically grown silicon dioxide films for solar cell. Nicholas E. Grant
Low temperature anodically grown silicon dioxide films for solar cell applications Nicholas E. Grant Outline 1. Electrochemical cell design and properties. 2. Direct-current current anodic oxidations-part
More informationSingle-walled carbon nanotubes as nano-electrode and nanoreactor to control the pathways of a redox reaction
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 014 Supporting information Single-walled carbon nanotubes as nano-electrode and nanoreactor to control
More informationLecture 4. Conductance sensors. ChemFET. Electrochemical Impedance Spectroscopy. py Practical consideration for electrochemical biosensors.
Lecture 4 Conductance sensors. ChemFET. Electrochemical Impedance Spectroscopy. py Practical consideration for electrochemical biosensors. Conductivity I V = I R=, L - conductance L= κa/, l Λ= κ /[ C]
More informationSUPPLEMENTARY INFORMATION
Design principles for maximizing photovoltage in metal-oxide-protected water-splitting photoanodes Andrew G. Scheuermann 1, John P. Lawrence 1, Kyle W. Kemp 1, T. Ito 1,2, Adrian Walsh 3, Christopher E.D.
More informationWanzhen Li, Longhua Ding, Qiaohong Wang and Bin Su*
Electronic Supplementary Material (ESI) for Analyst. This journal is The Royal Society of Chemistry 2014 Supporting Information to Differential Pulse Voltammetry Detection of Dopamine and Ascorbic Acid
More informationSupporting Information
Supporting Information Electrochemical Synthesis of Ammonia from N 2 and H 2 O under Ambient Conditions Using Pore-Size Controlled Hollow Gold Nanocatalysts with Tunable Plasmonic Properties Mohammadreza
More informationSupporting information
Supporting information Improvement of Transparent Conducting Performance on Oxygen- Activated Fluorine-Doped Tin Oxide Electrodes Formed by Horizontal Ultrasonic Spray Pyrolysis Deposition Bon-Ryul Koo,
More informationSupporting Information
Supporting Information Trace Levels of Copper in Carbon Materials Show Significant Electrochemical CO 2 Reduction Activity Yanwei Lum,,,, Youngkook Kwon,,, Peter Lobaccaro,,,# Le Chen,, Ezra Lee Clark,,,#
More informationSupporting Information
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2016 Supporting Information Synthesis and Application of Hexagonal Perovskite BaNiO 3 with Quadrivalent
More informationState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences,
Electronic Supplementary Material (ESI) for Chemical Science. This journal is The oyal Society of Chemistry 16 Electronic Supplementary Information Insight into the Charge Transfer in Particulate Ta 3
More informationAn Ideal Electrode Material, 3D Surface-Microporous Graphene for Supercapacitors with Ultrahigh Areal Capacitance
Supporting Information An Ideal Electrode Material, 3D Surface-Microporous Graphene for Supercapacitors with Ultrahigh Areal Capacitance Liang Chang, 1 Dario J. Stacchiola 2 and Yun Hang Hu 1, * 1. Department
More informatione - Galvanic Cell 1. Voltage Sources 1.1 Polymer Electrolyte Membrane (PEM) Fuel Cell
Galvanic cells convert different forms of energy (chemical fuel, sunlight, mechanical pressure, etc.) into electrical energy and heat. In this lecture, we are interested in some examples of galvanic cells.
More information