Measurement of interfacial charge transfer rate during visible light CO2 reduction under bias voltage conditions

Abstract

The study of photogenerated electron transfer pathway and time scale in photoelectrocatalysis is the key factor to improve the efficiency of light energy utilization. At present, the reduction of CO2 by visible light is one of the hotspots of research, but it is difficult to determine the reduction reaction and mechanism. Therefore, we use electrochemical in situ growth technology to prepare Bi2(MoO4)3, and then use photoelectrocatalytic method to reduce CO2. The results show that the rate of charge transfer at the interface is about 10−18 cm4/s in the reduction of CO2 by visible light under bias voltage, and the catalyst can react stably for 10 h. This provides a way to optimize the photogenerated electron transfer model and to design the catalysts for the reduction of carbon dioxide under visible light.