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Hybrid Photocathode Consisting of CuGaO2 p-Type Semiconductor and a Ru(II)–Re(I) Supramolecular Photocatalyst: Non-Biased Visible-Light-Driven CO2 Reduction with Water Oxidation

Abstract

A CuGaO2 p-type semiconductor electrode was successfully employed for constructing a new hybrid photocathode with a Ru(II)–Re(I) supramolecular photocatalyst (RuRe/CuGaO2). The RuRe/CuGaO2 photocathode displayed photoelectrochemical activity for the conversion of CO2 to CO in an aqueous electrolyte solution with a positive onset potential of +0.3 V vs. Ag/AgCl, which is 0.4 V more positive in comparison to a previously reported hybrid photocathode that used a NiO electrode instead of CuGaO2. A photoelectrochemical cell comprising this RuRe/CuGaO2 photocathode and a CoOx/TaON photoanode enabled the visible-light-driven catalytic reduction of CO2 using water as a reductant to give CO and O2 without applying any external bias. This is the first self-driven photoelectrochemical cell constructed with the molecular photocatalyst to achieve the reduction of CO2 only using visible light as energy source and water as a reductant.

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Publication details

The article was received on 01 Mar 2017, accepted on 05 Apr 2017 and first published on 06 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC00940B
Citation: Chem. Sci., 2017, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Hybrid Photocathode Consisting of CuGaO2 p-Type Semiconductor and a Ru(II)–Re(I) Supramolecular Photocatalyst: Non-Biased Visible-Light-Driven CO2 Reduction with Water Oxidation

    H. Kumagai, G. Sahara, K. Maeda, M. Higashi, R. Abe and O. Ishitani, Chem. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7SC00940B

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