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Evaluation of Pt, Ni, and Ni–Mo electrocatalysts for hydrogen evolution on crystalline Si electrodes

McKone, James R. and Warren, Emily L. and Bierman, Matthew J. and Boettcher, Shannon W. and Brunschwig, Bruce S. and Lewis, Nathan S. and Gray, Harry B. (2011) Evaluation of Pt, Ni, and Ni–Mo electrocatalysts for hydrogen evolution on crystalline Si electrodes. Energy and Environmental Science, 4 (9). pp. 3573-3583. ISSN 1754-5692.

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The dark electrocatalytic and light photocathodic hydrogen evolution properties of Ni, Ni–Mo alloys, and Pt on Si electrodes have been measured, to assess the viability of earth-abundant electrocatalysts for integrated, semiconductor coupled fuel formation. In the dark, the activities of these catalysts deposited on degenerately doped p^+-Si electrodes increased in the order Ni < Ni–Mo ≤ Pt. Ni–Mo deposited on degenerately doped Si microwires exhibited activity that was very similar to that of Pt deposited by metal evaporation on planar Si electrodes. Under 100 mW cm^(−2) of Air Mass 1.5 solar simulation, the energy conversion efficiencies of p-type Si/catalyst photoelectrodes ranged from 0.2–1%, and increased in the order Ni ≈ Ni–Mo < Pt, due to somewhat lower photovoltages and photocurrents for p-Si/Ni–Mo relative to p-Si/Ni and p-Si/Pt photoelectrodes. Deposition of the catalysts onto microwire arrays resulted in higher apparent catalytic activities and similar photoelectrode efficiencies than were observed on planar p-Si photocathodes, despite lower light absorption by p-Si in the microwire structures.

Item Type:Article
Related URLs:
URLURL TypeDescription
McKone, James R.0000-0001-6445-7884
Warren, Emily L.0000-0001-8568-7881
Boettcher, Shannon W.0000-0001-8971-9123
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Gray, Harry B.0000-0002-7937-7876
Additional Information:© 2011 The Royal Society of Chemistry. Received 19 Apr 2011, Accepted 22 Jun 2011. First published on the web 01 Aug 2011. This work was supported by the National Science Foundation (NSF) Powering the Planet Center for Chemical Innovation (CCI), Grants CHE-0802907 and CHE-0947829, and by the Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology. The authors would like to acknowledge Joseph Beardslee for assistance with XPS analysis. JRM would like to thank the Department of Energy, Office of Science, for a graduate research fellowship. SWB gratefully acknowledges fellowship support from the Kavli Nanoscience Institute.
Group:Kavli Nanoscience Institute, CCI Solar Fuels
Funding AgencyGrant Number
Caltech Beckman InstituteUNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20110929-104011152
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Official Citation:Evaluation of Pt, Ni, and Ni–Mo electrocatalysts for hydrogen evolution on crystalline Si electrodes James R. McKone, Emily L. Warren, Matthew J. Bierman, Shannon W. Boettcher, Bruce S. Brunschwig, Nathan S. Lewis and Harry B. Gray Energy Environ. Sci., 2011, 4, 3573-3583
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25490
Deposited By: Ruth Sustaita
Deposited On:30 Sep 2011 14:39
Last Modified:22 Nov 2019 09:58

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