Bi/2 H-MoS2_ x composite for efficient photo-thermal synergistic catalytic CO2 reduction

The high carrier recombination rate and poor photocorrosion resistance of intrinsic MoS2 lead to a poor photocatalytic CO2 reduction activity. Here, the photocatalytic CO2 reduction performance of 2 H-MoS2 was significantly enhanced by constructing Bi/2 H-MoS2_x composite and photo-thermal synergy strategy. Under the optimal conditions of 200 degrees C and 42 mW & sdot;cm-2 of 420 nm irradiation, Bi/2 H-MoS2_x exhibited an excellent photo-thermal synergistic catalytic activity of CO2 reduction with a CO production rate of 34.42 mu mol-1 & sdot;g-1 & sdot;h-1. Mechanistic studies showed that the introduction of Bi greatly improved the light absorption ability, generated S vacancies as electron capture centers for rapid separation of photocarriers, and promoted the generation of key intermediates. The involvement of heat led to a photo-thermal synergistic effect, which accelerated the charge migration and surface reaction rate. Our work provides new insights into the development of efficient catalysts for CO2 reduction and the mechanism study of photo-thermal synergistic catalysis.