Artificial photosynthetic reduction of CO2 into valuable chemicals is one of the most promising approaches to solve the energy crisis and decreasing atmospheric CO2 emissions. However, the poor selectivity accompanied by the low activity of photocatalysts limits the development of photocatalytic CO2 reduction. Herein, inspired by the use of oxygen vacancy engi-neering to promote the adsorption and activation of CO2 molecules, we introduced oxygen vacancies in the representative barium titanate (BaTiO 3 ) photocatalyst for photocatalytic CO2 reduction. We found that oxygen vacancies brought signifi cant diff erences in the CO2 photoreduction activity and selectivity of BaTiO 3 . The intrinsic BaTiO 3 showed a low photocatalytic activity with the dominant product of CO, whereas BaTiO 3 with oxygen vacancies exhibited a tenfold improvement in photocatalytic activity, with a high selectivity of ～ 90％ to CH 4 . We propose that the presence of oxygen vacancies promotes CO2 and H 2 O adsorption onto the BaTiO 3 surface and also improves the separation and transfer of photogenerated carriers, thereby boosting the photocatalytic CO2 reduction to CH 4 . This work highlights the essential role of oxygen vacancies in tuning the selectivity of photocatalyticreduction of CO2 into valuable chemicals.

Yi Wang;Chengbo Zhang;Rengui Li

State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian National Laboratory for Clean Energy,Dalian 116023,China;University ofChinese Academy ofSciences,Beijing 100049,China

天津大学学报（英文版）

[1]Yi Wang;Chengbo Zhang;Rengui Li-.Modulating the Selectivity of Photocatalytic CO2 Reduction in Barium Titanate by Introducing Oxygen Vacancies)[J].天津大学学报（英文版）,2022(04):227-235

Titanate,BaTiO,erences,photocatalyticreduction

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