Z-scheme reduction of carbon dioxide with visible light using a binuclear metal complex and a semiconductor

摘要

A hybrid material that consists of a semiconductor and a binuclear metal complex having a redox photosensitizer and a catalytic unit was employed as a photocatalyst for CO_2 reduction under visible light. It was found that this kind of hybrid was capable of reducing CO_2 into HCOOH (or CO) according to two-step photoexcitation of the semiconductor and the photosensitizer unit of the metal complex. It was found that semiconductors of TaON, CaTaO_2N, C_3N_4, and Y-Ta oxynitride became active component for this system driven by visible light (λ ＞ 400 nm) in combination with a binuclear Ru(Ⅱ) complex.