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

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 H2SO4(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. Therefore, the vertical sidewalls of the Si microwire photoelectrodes minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1468686
Grant/Contract Number:  
SC0004993
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Kempler, Paul A., Gonzalez, Miguel A., Papadantonakis, Kimberly M., and Lewis, Nathan S.. Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes. United States: N. p., 2018. Web. https://doi.org/10.1021/acsenergylett.8b00034.
Kempler, Paul A., Gonzalez, Miguel A., Papadantonakis, Kimberly M., & Lewis, Nathan S.. Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes. United States. https://doi.org/10.1021/acsenergylett.8b00034
Kempler, Paul A., Gonzalez, Miguel A., Papadantonakis, Kimberly M., and Lewis, Nathan S.. Thu . "Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes". United States. https://doi.org/10.1021/acsenergylett.8b00034. https://www.osti.gov/servlets/purl/1468686.
@article{osti_1468686,
title = {Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co–P Catalyst Films on Structured p-Si Photocathodes},
author = {Kempler, Paul A. and Gonzalez, Miguel A. and Papadantonakis, Kimberly M. and Lewis, Nathan S.},
abstractNote = {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 H2SO4(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. Therefore, the vertical sidewalls of the Si microwire photoelectrodes minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.},
doi = {10.1021/acsenergylett.8b00034},
journal = {ACS Energy Letters},
number = 3,
volume = 3,
place = {United States},
year = {2018},
month = {2}
}

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Cited by: 5 works
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Figures / Tables:

Figure 1 Figure 1: Scanning-electron micrographs of photoelectrochemically deposited Co-P particles after 400 mC cm-2 charge was passed. (A) Top-down image of planar p-Si, inset: magnified image of individual particle showing nanoscale roughness; (B) Top-down image of p-Si microwire array showing minimal deposition along the base and caps of the wires; (C)more » Image at 30-degrees tilt of p-Si micropyramid array; (D) Image at 20-degrees tilt of p-Si microwire array. The largest deposition occurred at the tips of the microwires.« less

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