Photodeposition is widely adopted for implanting metal/metal oxide cocatalysts on semiconductors.However,it is prerequisite that the photon energy should be sufficient to excite the host semiconductor.Here,we report a lower-energy irradiation powered deposition strategy for implanting CrOx cocatalyst on TiO2.Excitingly,CrOx-400 implanted under visible-light irradiation significantly promotes the CH4 evolu-tion rate on TiO2 to 8.4 μmol g-1 h-1 with selectivity of 98％ from photocatalytic CO2 reduction,which is 15 times of that on CrOx-200 implanted under UV-visible-light irradiation.Moreover,CrOx-400 is identified to be composed of higher valence Cr species compared to CrOx-200.This valence states regulation of Cr species is indicated to provide more active sites for CO2 adsorption/activation and to modulate the reac-tion mechanism from single Cr site to Cr-Cr dual sites,thus endowing the superior CH4 production.This work demonstrates an alternative strategy for constructing efficient metal oxides cocatalysts on wide bandgap semiconductor.

Jingjing Dong;Yuan Kong;Heng Cao;Zhiyu Wang;Zhirong Zhang;Lidong Zhang;Song Sun;Chen Gao;Xiaodi Zhu;Jun Bao

National Synchrotron Radiation Laboratory,Collaborative Innovation Center of Chemistry for Energy Materials,University of Science and Technology of China,Hefei 230029,Anhui,China;Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics,Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,Anhui,China;School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,Anhui,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

能源化学

[1]Jingjing Dong;Yuan Kong;Heng Cao;Zhiyu Wang;Zhirong Zhang;Lidong Zhang;Song Sun;Chen Gao;Xiaodi Zhu;Jun Bao-.Visible-light deposition of CrOx cocatalyst on TiO2∶Cr valence regulation for superior photocatalytic CO2 reduction to CH4)[J].能源化学,2022(01):103-112

Photodeposition

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