Engineering Oxygen Vacancies in Pt/TiO2 Catalysts for Efficient Light-Driven Reverse Water-Gas Shift

Oxygen vacancies are a key factor determining the efficiency of the CO2hydrogenation reaction and play a crucial role in CO2adsorption and activation. However, effectively regulating the concentration of oxygen vacancies to enhance the performance of the light-driven reverse water gas shift (RWGS) reaction remains a challenge. To address this, this study successfully developed Pt/TiO2catalysts with varying oxygen vacancy concentrations by controlling the morphology of TiO2. Structural characterization results indicate that, compared to Pt/TiO2-NR, Pt/TiO2-NB exhibits a higher oxygen vacancy (OV) concentration and greater CO2absorption. Catalytic performance evaluation results showed that under an irradiance of 2.5 W/cm2, the CO production rates of the Pt/TiO2-NB catalyst reached 57.03 mol·gPt−1·h−1. Furthermore, the catalyst maintained excellent catalytic stability during 45 h of continuous operation, demonstrating good potential for practical applications.