Photo-thermal synergistic catalytic carbon dioxide reduction on WN-WO3/In2O3 catalyst with controllable product selectivity

Here, the photo-thermal synergistic catalytic CO 2 reduction over WN-WO 3 /In 2 O 3 was studied in detail. By changing the component ratio of the ternary catalyst, the CO/CH 4 selectivity can be precisely regulated. Besides, compared to the sole photocatalysis, the introduction of external heat significantly enhanced the reaction activity, and led to a prominent effect on production selectivity. The optimal CH 4 selectivity was given by the ternary catalyst with 20% WN dosage under the reaction condition of 200 °C and 143 mW·cm −2 of 420 nm LED irradiation, with the CO and CH 4 production rates were 21.99 and 9.51 μmol·g −1 ·h −1 , respectively. EPR tests suggested the Z-scheme carrier transfer mechanism of the ternary catalyst, and In situ DRIFTS confirmed that *COOH and *CH 3 O are the important reaction intermediates for the generation of CO and CH 4 , respectively. Our work provides a new strategy for developing catalysts with both high CO 2 reduction efficiency and good product selectivity.