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Issue 20, 2014
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Photoelectrochemical and electrocatalytic properties of thermally oxidized copper oxide for efficient solar fuel production

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Abstract

We report the use of a facile and highly scalable synthesis process to control growth products of earth-abundant Cu-based oxides and their application in relevant photoelectrochemical and electrochemical solar fuel generation systems. Characterization of the synthesized Cu(I)/Cu(II) oxides indicates that their surface morphology and chemical composition can be simply tuned by varying two synthesis parameters (time and temperature). UV-Vis spectroscopy and impedance spectroscopy studies are performed to estimate the band structures and electronic properties of these p-type semiconductor materials. Photoelectrodes made of Cu oxides possess favorable energy band structures for production of hydrogen from water; the position of their conduction band is ≈1 V more negative than the water-reduction potential. High acceptor concentrations on the order of 1018–1019 cm−3 are obtained, producing large electric fields at the semiconductor–electrolyte interface and thereby enhancing charge separation. The highly crystalline pristine samples used as photocathodes in photoelectrochemical cells exhibit high photocurrents under AM 1.5G simulated illumination. When the samples are electrochemically reduced under galvanostatic conditions, the co-existence of the oxide with metallic Cu on the surface seems to function as an effective catalyst for the selective electrochemical reduction of CO2.

Graphical abstract: Photoelectrochemical and electrocatalytic properties of thermally oxidized copper oxide for efficient solar fuel production

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Publication details

The article was received on 24 Jan 2014, accepted on 04 Mar 2014 and first published on 05 Mar 2014


Article type: Paper
DOI: 10.1039/C4TA00442F
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 7389-7401
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    Photoelectrochemical and electrocatalytic properties of thermally oxidized copper oxide for efficient solar fuel production

    A. T. Garcia-Esparza, K. Limkrailassiri, F. Leroy, S. Rasul, W. Yu, L. Lin and K. Takanabe, J. Mater. Chem. A, 2014, 2, 7389
    DOI: 10.1039/C4TA00442F

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