期刊
CHINESE JOURNAL OF CATALYSIS
卷 43, 期 10, 页码 2625-2636出版社
ELSEVIER
DOI: 10.1016/S1872-2067(22)64115-9
关键词
Thin layer porous g-C 3 N 4; S -Scheme heterojunction; Photocatalytic CO 2 reduction; Fe-MOF; Surface intermediate
资金
- National Natural Science Foundation of China
- Science and Technology Planning Social Development Project of Zhenjiang City
- [22078131]
- [22108102]
- [SH2021013]
Regulating charge transfer can improve electron utilization and achieve efficient photoreduction of CO2. The S-scheme charge transfer mechanism was demonstrated in the CN/Fe-MOF heterojunction, resulting in higher CO yield and generation of HCOO-.
Regulating charge transfer to achieve specific transfer path can improve electron utilization and complete efficient photoreduction of CO2. Here, we fabricated a S-scheme heterojunction of CN/Fe-MOF by an in-situ assembly strategy. The S-scheme charge transfer mechanism was confirmed by band structure, electron spin resonance (ESR) and work function (0) analysis. On the one hand, the response of Fe-MOF in the visible region improved the utilization of light energy, thus increasing the ability of CN/Fe-MOF to generate charge carriers. On the other hand, CN, as the active site, not only had strong adsorption capacity for CO2, but also retained photogenerated electrons with high reduction capacity because of S-scheme charge transfer mechanism. Hence, in the absence of any sacrificial agent and cocatalyst, the optimized 50CN/Fe-MOF obtained the highest CO yield (19.17 mu mol g-1) under UV-Vis irradiation, which was almost 10 times higher than that of CN. In situ Fourier transform infrared spectra not only revealed that the photoreduction of CO2 occurred at the CN, but also demonstrated that the S-scheme charge transfer mechanism enabled 50CN/Fe-MOF to have a stronger ability to generate HCOO- than CN. Published by Elsevier B.V. All rights reserved.
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