Tunable Interfacial Charge Transfer in 2D-2D Composite for Efficient Visible-Light-Driven CO 2 Conversion.

Photocatalytic CO 2 conversion for hydrocarbon fuel production has been known as one of the most promising strategies for achieving carbon neutrality. Yet, its conversion efficiency remains unsatisfactory mainly due to its severe charge transfer resistance and slow charge kinetics. Herein, we demonstrate tunable interfacial charge transfer on oxygen vacancies modified bismuth molybdate nanoflower assembled by two-dimensional (2D) nanosheets (BMOVs) and 2D bismuthene composite (Bi/BMOVs) for photocatalytic CO 2 conversion. Specifically, the meticulous design of the Ohmic contact formed between BMOVs and bismuthene can allow the modulation of the interfacial charge transfer resistance. According to the density functional theory (DFT) simulations, it is ascertained that such exceptional charge kinetics is attributed to the tunable built-in electric field (IEF) of the Ohmic contact. As such, the photocatalytic CO 2 reduction performance of the optimized Bi/BMOVs (CO and CH 4 productions rate of 169.93 and 4.65 μmol g -1 h -1 , respectively) is ca. 10 times higher than that of the pristine BMO (CO and CH 4 productions rate of 16.06 and 0.51 μmol g -1 h -1 , respectively). The tunable interfacial resistance of the Ohmic contact reported in this work can shed some important light on the design of highly efficient photocatalysts for both energy and environmental applications. This article is protected by copyright. All rights reserved.