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Issue 4, 2011
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820 mV open-circuit voltages from Cu2O/CH3CN junctions

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P-Type cuprous oxide (Cu2O) 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 (Me10CoCp2+/0) redox couple, cuprous oxide yielded open-circuit voltage, Voc, values of 820 mV and short-circuit current density, Jsc, 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.

Graphical abstract: 820 mV open-circuit voltages from Cu2O/CH3CN junctions

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The article was received on 12 Oct 2010, accepted on 25 Nov 2010 and first published on 02 Feb 2011

Article type: Paper
DOI: 10.1039/C0EE00554A
Citation: Energy Environ. Sci., 2011,4, 1311-1318
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    820 mV open-circuit voltages from Cu2O/CH3CN junctions

    C. Xiang, G. M. Kimball, R. L. Grimm, B. S. Brunschwig, H. A. Atwater and N. S. Lewis, Energy Environ. Sci., 2011, 4, 1311
    DOI: 10.1039/C0EE00554A

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