Activation of Bi2moo6/Zn0.5cd0.5s Charge Transfer Through Interface Chemical Bonds and Surface Defects for Photothermal Catalytic Co2 Reduction

Abstract

AbstractsThe photocatalytic reduction of CO2(PCR) to high-value fuels was anticipated to address the energy crisis precipitated by the depletion of energy resources. Despite the extensive development of PCR catalysts, limitations remained, including poor CO2 adsorption/activation and low charge transfer efficiency. In this study, atomic-level interface Cd-O bonds were constructed to form Bi2MoO6/Zn0.5Cd0.5S heterojunctions using a defect-induced heterojunction strategy. The sulfur vacancies (VS) formed in Bi2MoO6/Zn0.5Cd0.5S served as active sites to enhance CO2 adsorption activation. The interfacial stability of the Cd-O bonds serves as an electron transfer channel, facilitating the transfer of electrons from the interface to the catalytic site. Concurrently, the VS and Cd-O bonds affect charge distribution induced the generation of interface electric field, which facilitated the upward shift of the d-band center, thereby enhancing the adsorption of reaction intermediates. The optimized Bi2MoO6/Zn0.5Cd0.5S heterostructure exhibited high selectivity and stability of photoelectrochemical properties for CO and generated 42.97μmol⋅g-1⋅h-1 of CO, which was 16.65-fold higher compared to Zn0.5Cd0.5S under visible light drive. This study provides a reasonable reference point for the rational design of the photocatalyst interface with the objective of improving the CO2 adsorption conversion efficiency of the photocatalyst.

Keywords: Sulfur vacancies, CO2 adsorption, Charge transfer dynamics, Photocatalysis