Hybrid photocathode consisting of a CuGaO2 p-type semiconductor and a Ru(ii)–Re(i) supramolecular photocatalyst: non-biased visible-light-driven CO2 reduction with water oxidation

• Kumagai, Hiromu

• Sahara, Go

• Maeda, Kazuhiko

• Higashi, Masanobu

• Abe, Ryu

• Ishitani, Osamu

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 by only using visible light as the energy source and water as a reductant.

Journal

• Chemical Science

  Chemical Science 8 (6), 4242-4249, 2017-06-01

  Royal Society of Chemistry (RSC)

Details

• CRID: 1050282810826044032
• NII Article ID: 120006329132
• NII Book ID: AA12555653
• ISSN: 20416520
• ISSN: 20416539
• HANDLE: 2433/226519
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles