Photothermal catalytic reduction of CO 2 is a powerful way to promote carbon neutralization goals. However, there are few reports on the deactivation of the photothermal CO 2 reduction reaction. Here, we observed an interesting deactivation phenomenon of photothermal CO 2 conversion over TiO 2−x H x (black TiO 2 ). Despite the presence of a reducing atmosphere of H 2 , the oxygen vacancy concentration of TiO 2−x H x is reduced, resulting in the deactivation of photothermal CO 2 reduction. After Ni is modified onto TiO 2−x H x , Ni can activate H 2 to form H s , and the oxygen vacancy concentration of Ni/TiO 2−x H x may be maintained, thus solving the deactivation problem in photothermal CO 2 hydrogenation.

Photocatalytic CO2 reduction is of great significance for alleviating environmental pollution and energy shortages. Double transition metal oxide semiconductors are a commonly used material library in the field of photocatalysis....

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