0D/2D Bi2MoO6 quantum dots /rGO heterojunction boosting full solar spectrum-driven photothermal catalytic CO2 reduction to solar fuels

Abstract

The photothermal-catalyzed CO2 reduction is severely limited by the low carrier transport capacity. In this paper, the in-situ construction of 0D/2D Bi2MoO6 (BMO)/reduced Graphene Oxide (rGO) heterojunction was synthesized. The excellent photothermal conversion ability of rGO promotes the high dispersion of BMO quantum dots (QDs). The size of synthesized BMO QDs is about 4.26 nm and the temperature of the catalysts can quickly rise to 68.0 °C. XPS results show that the C–O–Bi interfacial electronic bridge between surface oxygen-containing groups and BMO QDs was successfully induced by modulating the degree of GO reduction. Electrons generated by BMO QDs migrate to the rGO surface rapidly, inducing rGO as a new electron-rich surface for rapid activation of CO2. The 1:5 BMO/rGO (NaBH4) CO yield reaches 186.87 μmol/g, which is 4.64 times as much as BMO QDs.