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

Go Sahara (1) , Hiromu Kumagai (1) , Kazuhiko Maeda (1) , Nicolas Kaeffer (2) , Vincent Artero (3) , Masanobu Higashi (2) , Ryu Abe (2) , Osamu Ishitani (1)

1 Department of Chemistry, School of Science
2 Department of Energy and Hydrocarbon Chemistry
3 LCBM - UMR 5249 - Laboratoire de Chimie et Biologie des Métaux

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 bias (0.10 V) produced by a pH difference. This is the first example of a molecular and semiconductor photocatalyst hybrid-constructed photoelectrochemical cell for visibl-light-driven CO2 reduction using water as a reductant.

Domaines: Chimie; Catalyse; Matériaux

Go Sahara, Hiromu Kumagai, Kazuhiko Maeda, Nicolas Kaeffer, Vincent Artero, et al.. Photoelectrochemical Reduction of CO2 Coupled to Water Oxidation Using a Photocathode With a Ru(II)-Re(I) Complex Photocatalyst and a CoOx/TaON Photoanode.. Journal of the American Chemical Society, 2016, 138 (42), pp.14152-14158. ⟨10.1021/jacs.6b09212⟩. ⟨hal-01419396⟩