Black In_(2)O_(3−x) nanosheets for efficient solar-driven reverse water-gas shift reactionOA

Increasing the number of surface-active sites and light-harvesting capability of catalysts by regulating their electronic structures is critical for solar-driven reactions.Herein,we report an oxygen-defective rich catalyst,black In_(2)O_(3−x) nanosheets,as efficient catalysts for solar-driven CO_(2) hydrogenation reaction.The efficiency of CO_(2) hydrogenation can be enhanced through the combination of interband transition and active sites oxygen vacancies,coupled with exceptional photothermal conversion that rapidly elevates the catalyst surface temperature to 299℃.Experimental results and characterization analyses reveal that the introduction of oxygen vacancies not only furnishes abundant adsorption and activation sites for CO_(2) but also extends the light absorption range of In_(2)O_(3−x) and improves the photothermal conversion efficiency.Black In_(2)O_(3−x) nanosheets with oxygen-rich defects exhibit remarkable solar-driven catalytic performance in the reverse water-gas shift(RWGS)reaction,achieving a CO generation rate as high as 69.8 mmol·h^(−1)·m^(−2) with a selectivity approaching 100%.This study demonstrates that structural engineering of In_(2)O_(3) nanosheets via a mild room temperature lithium reduction strategy significantly enhances catalytic activity,a methodology promising for broader applications.