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Comparison of the Performance of CoP-Coated and Pt-Coated Radial Junction n^+p-Silicon Microwire-Array Photocathodes for the Sunlight-Driven Reduction of Water to H_2(g)

Roske, Christopher W. and Popczun, Eric J. and Seger, Brian and Read, Carlos G. and Pedersen, Thomas and Hansen, Ole and Vesborg, Peter C. K. and Brunschwig, Bruce S. and Schaak, Raymond E. and Chorkendorff, Ib and Gray, Harry B. and Lewis, Nathan S. (2015) Comparison of the Performance of CoP-Coated and Pt-Coated Radial Junction n^+p-Silicon Microwire-Array Photocathodes for the Sunlight-Driven Reduction of Water to H_2(g). Journal of Physical Chemistry Letters, 6 (9). pp. 1679-1683. ISSN 1948-7185 . https://resolver.caltech.edu/CaltechAUTHORS:20150428-095042468

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Abstract

The electrocatalytic performance for hydrogen evolution has been evaluated for radial-junction n^+p-Si microwire (MW) arrays with Pt or cobalt phosphide, CoP, nanoparticulate catalysts in contact with 0.50 M H_2SO_4(aq). The CoP-coated (2.0 mg cm^(–2)) n^+p-Si MW photocathodes were stable for over 12 h of continuous operation and produced an open-circuit photovoltage (V_(oc)) of 0.48 V, a light-limited photocurrent density (J_(ph)) of 17 mA cm^(–2), a fill factor (ff) of 0.24, and an ideal regenerative cell efficiency (η_(IRC)) of 1.9% under simulated 1 Sun illumination. Pt-coated (0.5 mg cm^(–2)) n^+p-Si MW-array photocathodes produced V_(oc) = 0.44 V, J_(ph) = 14 mA cm^(–2), ff = 0.46, and η = 2.9% under identical conditions. Thus, the MW geometry allows the fabrication of photocathodes entirely comprised of earth-abundant materials that exhibit performance comparable to that of devices that contain Pt.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acs.jpclett.5b00495DOIArticle
http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.5b00495PublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/acs.jpclett.5b00495PublisherSupporting Information
ORCID:
AuthorORCID
Brunschwig, Bruce S.0000-0002-6135-6727
Gray, Harry B.0000-0002-7937-7876
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2015 American Chemical Society. Received: March 9, 2015; Accepted: April 7, 2015; Publication Date (Web): April 20, 2015. This work was supported by the NSF CCI Solar Fuels Program (CHE-1305124) and the Center for Individual Nanoparticle Functionality (CINF) (DNRF54). C.W.R. thanks the National Science Foundation and Link Energy Foundation for graduate research fellowships. Research was in part carried out at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. N.S.L. acknowledges support from the Energy from Sunlight Project funded by the Gordon and Betty Moore Foundation (GBMF1225).
Group:CCI Solar Fuels
Funders:
Funding AgencyGrant Number
NSFCHE-1305124
Danish National Research FoundationDNRF54
Link Energy FoundationUNSPECIFIED
Gordon and Betty Moore FoundationGBMF1225
Issue or Number:9
Record Number:CaltechAUTHORS:20150428-095042468
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150428-095042468
Official Citation:Comparison of the Performance of CoP-Coated and Pt-Coated Radial Junction n+p-Silicon Microwire-Array Photocathodes for the Sunlight-Driven Reduction of Water to H2(g) Christopher W. Roske, Eric J. Popczun, Brian Seger, Carlos G. Read, Thomas Pedersen, Ole Hansen, Peter C. K. Vesborg, Bruce S. Brunschwig, Raymond E. Schaak, Ib Chorkendorff, Harry B. Gray, and Nathan S. Lewis The Journal of Physical Chemistry Letters 2015 6 (9), 1679-1683 DOI: 10.1021/acs.jpclett.5b00495
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57042
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Apr 2015 18:31
Last Modified:22 Nov 2019 09:58

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