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J Am Chem Soc. 2016 Oct 26;138(42):14152-14158. doi: 10.1021/jacs.6b09212. Epub 2016 Oct 14.

Photoelectrochemical Reduction of CO2 Coupled to Water Oxidation Using a Photocathode with a Ru(II)-Re(I) Complex Photocatalyst and a CoOx/TaON Photoanode.

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Department of Chemistry, School of Science, Tokyo Institute of Technology , O-okayama 2-12-1-NE-1, Meguro-ku, Tokyo 152-8550, Japan.
Laboratoire de Chimie et Biologie des Métaux, Université Grenoble Alpes , CNRS UMR 5249, CEA, F-38000 Grenoble, France.
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.


Photoelectrochemical CO2 reduction activity of a hybrid photocathode, based on a Ru(II)-Re(I) supramolecular metal complex photocatalyst immobilized on a NiO electrode (NiO-RuRe), was confirmed in an aqueous electrolyte solution. Under half-reaction conditions, the NiO-RuRe photocathode generated CO with high selectivity, and its turnover number for CO formation reached 32 based on the amount of immobilized RuRe. A photoelectrochemical cell comprising a NiO-RuRe photocathode and a CoOx/TaON photoanode showed activity for visible-light-driven CO2 reduction using water as a reductant to generate CO and O2, with the assistance of an external electrical (0.3 V) and chemical (0.10 V) bias produced by a pH difference. This is the first example of a molecular and semiconductor photocatalyst hybrid-constructed photoelectrochemical cell for visible-light-driven CO2 reduction using water as a reductant.


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