Z-Schematic and visible-light-driven CO₂ reduction using H₂O as an electron donor by a particulate mixture of a Ru-complex/(CuGa)_1−xZn_2xS₂ hybrid catalyst, BiVO₄ and an electron mediator

Abstract

Visible-light-driven Z-schematic CO2 reduction using H2O as an electron donor was achieved using a simple mixture of a metal-sulfide/molecular hybrid photocatalyst for CO2 reduction, a water oxidation photocatalyst and a redox-shuttle electron mediator. This is the first demonstration of a highly selective particulate CO2 reduction system accompanying O2 generation utilizing a semiconductor/molecular hybrid photocatalyst.

Water Oxidation Catalysts for Artificial Photosynthesis

“…For example, Sato et al reported a hybrid system composed of a Ru molecular catalyst modified p‐InP photocathode and a TiO 2 or SrTiO 3 photoanode for simultaneous CO 2 reduction and water oxidation, respectively, under ultraviolet light irradiation . Kudo and co‐workers constructed a hybrid Z‐schematic system using [Ru(dpbpy)] (dpbpy = 4,4′‐diphosphonate‐2,2′‐bipyridine) modified (CuGa) 1− x Zn 2 x S 2 as photocatalyst for CO 2 reduction and BiVO 4 as an efficient visible‐responsive photocatalyst for water oxidation along with a [Co(tpy) 2 ] 3+/2+ redox mediator, achieving efficient CO 2 reduction in an aqueous solution and stoichiometric oxygen evolution simultaneously . Further improvement of Z‐scheme artificial photosynthesis system has been hindered by backward reactions involving reversible redox mediators.…”

Durable photoelectrochemical CO2 reduction with water oxidation using a visible-light driven molecular photocathode

“…In this system, the Ru(II) complex was again used as the catalyst for CO 2 reduction. 3 The reported systems exhibit a low selectivity of CO 2 reduction against H 2 evolution and insufficient durability. It is again emphasized that, in these systems, light absorbers are the semiconductor materials, and the Ru(II) complex works only as the catalyst.…”

Nanostructured Semiconductors for Photocatalytic CO2 Reduction

“…(c) Schematic illustration of the formation of hybrid CuO-TiO 2 À x N x hollow nanocube and its FESEM images [76]. (d) Z-schematic system of visible light-driven CO 2 reduction of [Ru(dpbpy)]-modified (CuGa) 1 À x Zn 2x S 2 hybrid photocatalyst, BiVO 4 photocatalyst, and [Co (tpy) 2 ] 3+/2+ redox shuttle electron mediator [78]. (Reproduced permission from The Royal Society of Chemistry.)…”