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Title: p-Type CuRhO2 as a Self-Healing Photoelectrode for Water Reduction under Visible Light

Abstract

Polycrystalline CuRhO2 is investigated as a photocathode for the splitting of water under visible irradiation. The band edge positions of this material straddle the water oxidation and reduction redox potentials. Thus, photogenerated conduction band electrons are sufficiently energetic to reduce water, while the associated valence band holes are energetically able to oxidize water to O2. Under visible illumination, H2 production is observed with ~0.2 V underpotential in an air-saturated solution. In contrast, H2 production in an Ar-saturated solution was found to be unstable. This instability is associated with the reduction of the semiconductor forming Cu(s). However, in the presence of air or O2, bulk Cu(s) was not detected, implying that CuRhO2 is self-healing when air is present. Here, this property allows for the stable formation of H2 with ca. 80% Faradaic efficiency.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Org.:
Princeton University
OSTI Identifier:
1418445
Grant/Contract Number:  
SC0002133
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 136; Journal Issue: 3; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; photoelectrochemistry; water splitting; solar fuels; new photocathode materials; CuRhO2

Citation Formats

Gu, Jing, Krizan, Jason W., Gibson, Quinn D., Detweiler, Zachary M., Cava, Robert J., Bocarsly, Andrew B., and Yang, Yong. p-Type CuRhO2 as a Self-Healing Photoelectrode for Water Reduction under Visible Light. United States: N. p., 2013. Web. doi:10.1021/ja408876k.
Gu, Jing, Krizan, Jason W., Gibson, Quinn D., Detweiler, Zachary M., Cava, Robert J., Bocarsly, Andrew B., & Yang, Yong. p-Type CuRhO2 as a Self-Healing Photoelectrode for Water Reduction under Visible Light. United States. https://doi.org/10.1021/ja408876k
Gu, Jing, Krizan, Jason W., Gibson, Quinn D., Detweiler, Zachary M., Cava, Robert J., Bocarsly, Andrew B., and Yang, Yong. Mon . "p-Type CuRhO2 as a Self-Healing Photoelectrode for Water Reduction under Visible Light". United States. https://doi.org/10.1021/ja408876k. https://www.osti.gov/servlets/purl/1418445.
@article{osti_1418445,
title = {p-Type CuRhO2 as a Self-Healing Photoelectrode for Water Reduction under Visible Light},
author = {Gu, Jing and Krizan, Jason W. and Gibson, Quinn D. and Detweiler, Zachary M. and Cava, Robert J. and Bocarsly, Andrew B. and Yang, Yong},
abstractNote = {Polycrystalline CuRhO2 is investigated as a photocathode for the splitting of water under visible irradiation. The band edge positions of this material straddle the water oxidation and reduction redox potentials. Thus, photogenerated conduction band electrons are sufficiently energetic to reduce water, while the associated valence band holes are energetically able to oxidize water to O2. Under visible illumination, H2 production is observed with ~0.2 V underpotential in an air-saturated solution. In contrast, H2 production in an Ar-saturated solution was found to be unstable. This instability is associated with the reduction of the semiconductor forming Cu(s). However, in the presence of air or O2, bulk Cu(s) was not detected, implying that CuRhO2 is self-healing when air is present. Here, this property allows for the stable formation of H2 with ca. 80% Faradaic efficiency.},
doi = {10.1021/ja408876k},
journal = {Journal of the American Chemical Society},
number = 3,
volume = 136,
place = {United States},
year = {Mon Dec 30 00:00:00 EST 2013},
month = {Mon Dec 30 00:00:00 EST 2013}
}

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