Nanostructured Materials for Energy Conversion and Storage

Transcription

1 Presentation for 2016 Energy Research Collaboration Workshop 5/10/2016 Nanostructured Materials for Energy Conversion and Storage Jeffrey T. Glass Professor, Department of Electrical and Computer Engineering Professor, Departments of Mechanical Engineering and Materials Science Hogg Family Director of Engineering Management and Entrepreneurship Duke University, Pratt School of Engineering Durham, NC 27708

2 The Team and Funding Students: Isvar Cordova, Billyde Brown, Shane DiDona, Isa Ferrell, Phillip Herr, Philemon Henry, Erich Radauscher, James Thostenson, Akshay Raut, Barbara Raynal, Zach Russell, Doreen Wong, Stephen Ubnoske, Tanouir Aloui, Tasso von Windheim, Yihao Zhao Post Doc: Edgard Ngaboyamahina Research Scientists: Matt Kirley, Jason Amsden Lab Director: Charles Parker Collaborator: Brian R. Stoner, Sr. Research Fellow, RTI Int. Research Triangle Park, NC Funding: National Science Foundation (DMR & ECCS), Department of Homeland Security, National Institutes of Health, Gates Foundation, DOE ARPA-E, DARPA, DTRA 2

3 Capabilities Plasma Enhanced Chemical Vapor Deposition Atomic Layer Deposition of Oxides In-vacuo XPS and UPS Electrochemical Techniques Voltammetry, Electrochemical Impedance Spectroscopy (EIS), Potential Transient Measurements (PTM), Incident Photon Conversion Efficiency (IPCE) Microfabrication ( MEMS ) with RTI 3

4 50 mm Micro-patterned CNTs

5 Vertically Aligned Graphene Nanosheets

6 Graphenated CNTs A hybrid structure of graphene foliates along the length of aligned multi-walled CNTs. 200 nm 200 nm 200 nm Parker et al., Journal of Materials Research v27, p1046(2012)

7 Hybrid Graphene-CNT Nanostructures: Enhanced Energy Storage High capacitance achieved through hybrid graphene-cnt structure Increased deposition time correlates with increased graphene foliate density and leads to higher capacitance for energy storage.

8 Hybrid Graphene-CNT Nanostructures: Enhanced Catalytic Activity High catalytic activity achieved through hybrid graphene-cnt structure 200 nm CNT g-cnt C-V curves using the ferri-ferrocyanide couple to examine catalytic activity and electron transfer rates

9 Solar Fuels via Atomic Layer Deposition of Nanostructured Photoelectrodes Self-Limiting Growth Process Enables Deposition of Conformal and Uniform Ultra-Thin Films nanofto photon photon -OH O 2 2 μm Planar FTO Porous Heterostructure Design Enhances Energy Conversion Efficiency TiO 2 ALD Enables Optimization of Coating Thickness without Sacrificing Porosity

10 Solar Fuels via Atomic Layer Deposition of Nanostructured Photoelectrodes IPCE (%) TiO 2 (10nm)/nanoFTO TiO 2 Nanowires Pure nanofto 1 m Wavelength (nm) Incident Photon to Current Conversion Efficiency (IPCE) comparison between our Heteronanostructure and TiO2 Nanowires Schematic of Photoconversion Mechanism (above) Expected from our Nanostructure (below)

11 Additional Energy Applications of Interest Miniature mass spectrometer for methane detection Electrochemical disinfection for energy neutral off-grid toilet for the developing world 11

12 Coded Aperture Miniature Mass Spectrometer The Ultimate Chemical Sensor Energy Applications: Detection of rogue methane at well heads and refinery perimeters Microfabrication Process 500 microns amu

13 Slit array Aperture Raw Data Mass Spectrum Single Slit Aperture Raw data Mass Spectrum Aperture Coding: Results for Ethanol Traditional Magnetic Sector Mass Spectrometry with a Single Slit Magnetic Sector Mass Spectrometry with a Coded Aperture showing a >10x signal gain

14 Energy Neutral Off- Grid Toilets for the Developing World Electrochemical disinfection of liquid waste 14

15 Energy Minimization Mode Energy (Wh/L) Disinfection Time (mins/l) Continuous ON Short-time 3.71* NA * Pulsed (50% DC) Pulsed (10% DC) * Disinfection was not achieved 66% energy saving by using 10% duty cycle pulsed mode as opposed to continuous ON mode Electrochemical Disinfection of Human Liquid Waste 15