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820 mV open-circuit voltages from Cu_(2)O/CH_(3)CN junctions

Xiang, Chengxiang and Kimball, Gregory M. and Grimm, Ronald L. and Brunschwig, Bruce S. and Atwater, Harry A. and Lewis, Nathan S. (2011) 820 mV open-circuit voltages from Cu_(2)O/CH_(3)CN junctions. Energy and Environmental Science, 4 (4). pp. 1311-1318. ISSN 1754-5692. doi:10.1039/c0ee00554a.

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P-Type cuprous oxide (Cu_(2)O) photoelectrodes prepared by the thermal oxidation of Cu foils exhibited open-circuit voltages in excess of 800 mV in nonaqueous regenerative photoelectrochemical cells. In contact with the decamethylcobaltocene^(+/0) (Me_(10)CoCp_(2)^(+/0)) redox couple, cuprous oxide yielded open-circuit voltage, V_(oc), values of 820 mV and short-circuit current density, J_(sc), values of 3.1 mA cm^(−2) under simulated air mass 1.5 illumination. The energy-conversion efficiency of 1.5% was limited by solution absorption and optical reflection losses that reduced the short-circuit photocurrent density. Spectral response measurements demonstrated that the internal quantum yield approached unity in the 400–500 nm spectral range, but poor red response, attributable to bulk recombination, lowered the overall efficiency of the cell. X-Ray photoelectron spectroscopy and Auger electron spectroscopy indicated that the photoelectrodes had a high-quality cuprous oxide surface, and revealed no observable photocorrosion during operation in the nonaqueous electrolyte. The semiconductor/liquid junctions thus provide a noninvasive method to investigate the energy-conversion properties of cuprous oxide without the confounding factors of deleterious surface reactions.

Item Type:Article
Related URLs:
URLURL TypeDescription
Xiang, Chengxiang0000-0002-1698-6754
Grimm, Ronald L.0000-0003-0407-937X
Brunschwig, Bruce S.0000-0002-6135-6727
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2011 Royal Society of Chemistry. Received 12th October 2010, Accepted 25th November 2010. This work was supported by the Office of Energy Efficiency and Renewable Energy, US Department of Energy under Grant DE-FG36-08GO18006, the Caltech Center for Sustainable Energy Research (CCSER), and the Dow Chemical Company. One of us (GMK) acknowledges support under an NDSEG graduate fellowship.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG36-08GO18006
Caltech Center for Sustainable Energy ResearchUNSPECIFIED
Dow Chemical CompanyUNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20110421-100446025
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23410
Deposited On:21 Apr 2011 20:11
Last Modified:09 Nov 2021 16:14

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