Ni-Mo Nanocatalysts on N-Doped Graphite Nanotubes for Highly Efficient Electrochemical Hydrogen Evolution in Acid

Transcription

1 Supporting Information Ni-Mo Nanocatalysts on N-Doped Graphite Nanotubes for Highly Efficient Electrochemical Hydrogen Evolution in Acid Teng Wang, Yanru Guo, Zhenxing Zhou, Xinghua Chang, Jie Zheng *, and Xingguo Li * Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing (China);

2 Table S1. Elemental composition of Ni-NGTs and NiMo-NGTs by ICP method sample Ni(wt%) Mo(wt%) C (wt%) N (wt%) Ni-NGTs NiMo-NGTs Figure S1. Full-range XPS spectra of NiMo-NGTs Table S2. Elemental composition on surface of NiMo-NGTs from XPS spectra. sample Ni (wt%) Mo (wt%) C (wt%) N (wt%) NiMo-NGTs

3 Figure. S2 Cyclic voltammetry tests in a non-faradaic region (0.04 to 0.12 V vs RHE) with different scan rates to determine the electrochemical double layer capacitance C dl : the NiMo-NGTs (a) and Ni-NGTs (b) in 0.5 M H 2 SO 4. Figure. S3 TEM images of the NiMo-NGTs catalyst after chronopotentiometry at constant current density of 20 ma cm -2 ;

4 Figure S4 Chronopotentiometry test of NiMo-NGTs at different current density in 0.5 M H 2 SO 4 Figure S5. Linear polarization curves after 10,000 cyclic voltammetry (CV) cycles of NiMo-NGTs in 0.5 M H 2 SO 4 Table S3. Key parameters of the poly-si solar cell in AM1.5 condition Voc (V) I sc (ma) P max (W) Fill factor %

5 Figure S6. (a) linear polarization curve of RuO 2 for OER catalysis in in 0.5 M H 2 SO 4. (b) i-v curve of polarization curve of the electrolyzer with and without ir correction. Figure. S7. XPS spectra of NiMo-NGTs and Mo-NC catalyst: (a) Mo 3d and (b) N 1s

6 Figure. S8.electrochemical properties of NiMo-NGTs, Mo-NC, NiMo-NC, CoMo-NGTs catalysts in 0.5 M H 2 SO 4 : linear polarization curves (a) and the Tafel plots (b), Figure S9. Cyclic voltammetry tests in a non-faradaic region (0.04 to 0.12 V vs RHE) with different scan rates to determine the electrochemical double layer capacitance C dl : (a) Mo-NC and (b) NiMo-NC. (c) The current vs scan rate (i C -v) plots to calculate the double layer capacitance C dl of Mo-NC, compared with the result of NiMo-NGTs.

7 Table S4 Summary of the HER catalytic activity of representative Ni/Mo-based catalysts in acid solutions Catalyst Electrolyte Loading (mg/cm 2 ) η (mv) j (ma cm -2 ) Ref This work NiMo-NGTs 0.5 M H 2 SO This work NiMoN x nanosheets CoMoN x nanosheets Ni-Mo nanopowders 0.5 M H 2 SO M H 2 SO M H 2 SO Mo 2 C 0.1 M HClO MoP 0.5 M H 2 SO MoB 1 M H 2 SO MoCNs@carbon 0.5 M H 2 SO Mo 2 C-NC 0.5 M H 2 SO Ni 2 P NPs 0.5 M H 2 SO NiP carbon cloth 0.5 M H 2 SO REFERENCE 1. Chen, W. F.; Sasaki, K.; Ma, C.; Frenkel, A. I.; Marinkovic, N.; Muckerman, J. T.; Zhu, Y.; Adzic, R. R., Hydrogen-Evolution Catalysts Based on Non-Noble Metal Nickel-Molybdenum Nitride Nanosheets. Angew. Chem. Int. Ed. 2012, 51, Cao, B.; Veith, G. M.; Neuefeind, J. C.; Adzic, R. R.; Khalifah, P. G., Mixed

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9 Hydrogen Evolution Reaction. J. Am. Chem. Soc. 2013, 135, Jiang, P.; Liu, Q.; Sun, X., NiP 2 Nanosheet Arrays Supported on Carbon Cloth: An Efficient 3d Hydrogen Evolution Cathode in Both Acidic and Alkaline Solutions. Nanoscale 2014, 6,