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Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes

Kempler, Paul A. and Gonzalez, Miguel A. and Papadantonakis, Kimberly M. and Lewis, Nathan S. (2018) Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes. ACS Energy Letters, 3 (3). pp. 612-617. ISSN 2380-8195. http://resolver.caltech.edu/CaltechAUTHORS:20180220-133422256

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Abstract

Planar and three-dimensionally structured p-Si devices, consisting of an electrodeposited Co–P catalyst on arrays of Si microwires or Si micropyramids, were used as photocathodes for solar-driven hydrogen evolution in 0.50 M H_2SO_4(aq) to assess the effects of electrode structuring on parasitic absorption by the catalyst. Without the use of an emitter layer, p-Si/Co–P microwire arrays produced a photocurrent density of −10 mA cm^(–2) at potentials that were 130 mV more positive than those of optimized planar p-Si/Co–P devices. Champion p-Si/Co–P microwire array devices exhibited ideal regenerative cell solar-to-hydrogen efficiencies of >2.5% and were primarily limited by the photovoltage of the p-Si/Co–P junction. The vertical sidewalls of the Si microwire photoelectrodes thus minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acsenergylett.8b00034DOIArticle
https://pubs.acs.org/doi/10.1021/acsenergylett.8b00034PublisherArticle
https://pubs.acs.org/doi/suppl/10.1021/acsenergylett.8b00034PublisherSupporting Information
ORCID:
AuthorORCID
Kempler, Paul A.0000-0003-3909-1790
Papadantonakis, Kimberly M.0000-0002-9900-5500
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2018 American Chemical Society. Received: January 9, 2018; Accepted: February 8, 2018; Published: February 8, 2018. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. The authors declare no competing financial interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Record Number:CaltechAUTHORS:20180220-133422256
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180220-133422256
Official Citation:Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes. Paul A. Kempler, Miguel A. Gonzalez, Kimberly M. Papadantonakis, and Nathan S. Lewis. ACS Energy Letters 2018 3 (3), 612-617. DOI: 10.1021/acsenergylett.8b00034
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84894
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Feb 2018 04:51
Last Modified:29 Mar 2018 17:30

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