Photoelectrothermocatalytic reduction of CO 2 to glycol via Cu 2 S/MoS 2-Vs octahedral heterostructure with synergistic mechanism

The defects and interface engineering are efficient approaches to adjust the physical and chemical properties of nanomaterials to enhance catalytic performance. In this study, we report a new MOFs-driven porous Cu 2 S/MoS 2 - Vs octahedral semiconductor with heterostructure and photothermal effect. The introduction of sulfur vacancies directly improves the adsorption performance of CO 2 , and the formation of heterostructure significantly increases the charge transfer rate. The C -penetrating material obtained from MOFs not only acts as an octahedral skeleton support, but also gives photothermal effects under photoelectric conditions. The formation rate of sole C 2 products in photoelectrocatalytic CO 2 reduction by using Cu 2 S/MoS 2 -Vs heterostructure is up to 52 jiM.h - 1 .cm - 2 equal to the total electron transfer rate of 541 jiM.h - 1 .cm - 2 . The carbene mechanism and reaction pathways were proposed and verified by 13 CO 2 isotopic labelling and operando Fourier transform infrared (FT-IR) spectra. The important intermediates of *CO 2 - , * - - C - - O, *CHO and *CHO-CHO were identified by operando FT-IR spectra. In the comparative experiments, the photothermal electrons are beneficial to C 2 products. DFT calculations indicate that the presence of S vacancies (Vs) reduces the energy barrier for product generation.