Mesoporous TS-1 zeolite-confined metal oxides photocathode for efficient reduction of carbon dioxide to methanol

Excessive CO 2 emission has caused serious environmental problems, and converting CO 2 to high value-added fuels is attractive for solving energy and environmental crisis. Herein, a novel mesoporous TS-1(mTS-1) zeolite-confined metal oxides nanoclusters Cu-Bi@mTS-1 was developed for efficient photoelectrochemical reduction reaction of CO 2 (PEC CO 2 RR). The catalyst Cu-Bi@mTS-1 as a photocathode showed high activity, achieving a maximum methanol Faraday efficiency (FE CH3OH ) of 93.4 % at −0.7 V vs. RHE. The C 2 product ethanol could be also detected at higher potentials during PEC CO 2 RR. In-situ FTIR results indicate the occurrence of key reaction intermediates *CO, *CHO, *OCCO and *COCHO during the conversion of CO 2 to CH 3 OH and CH 3 CH 2 OH. It is believed that the hierarchically porous structure of mTS-1 is conducive to the enrichment of CO 2 molecules to increase the reactant concentration, also can promote C-C coupling through photoelectric synergism. This work provides a favorable reference for the rational design of photocathodes by confinement effect of porous structure.