期刊
JOURNAL OF CATALYSIS
卷 397, 期 -, 页码 128-136出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2021.03.018
关键词
Photocatalysis; CO2 reduction reactions; Metal organic frameworks; CdS
资金
- National Natural Science Foundation of China [22072101, 22075193,51911540473]
- Natural Science Research Project of Jiangsu Higher Education Institutions of China [18KJA480004]
- Key Technology Initiative of Suzhou Municipal Science and Technology Bureau [SYG201934]
- Six Talent Peaks Project in Jiangsu Province [TD-XCL-006]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
The study successfully utilized MOF of Co(BDC) as a bridge to connect the heterogeneous CdS photosensitizer and molecular co-catalyst, promoting photocatalytic CO2 reduction reactions with high CO yield rate and selectivity. The improved photocatalytic performance was attributed to efficient charge transfer at interfaces and the MOF layer expediting mass kinetics of the triphasic solid-liquid-gas reaction.
Photocatalytic CO2 reduction mimicking the nature photosynthetic process has been long desired by researchers for closing the carbon cycle, and relies on the exquisite design of efficient photocatalytic systems. Herein, MOF of Co(BDC) is employed to bridge the heterogeneous CdS photosensitizer and molecular co-catalyst [Co(bpy)(3)](2+) for promoting photocatalytic CO2 reduction reactions (CO2RR), resulting in a remarkable CO yield rate of 22 mu mol h(-1) and selectivity of 92.5%. Accordingly, the turnover number is 7.3 (4 h) with an apparent quantum yield about 0.7% at lambda = 420 nm. Through a comprehensive kinetic and spectroscopic study, we show the improved photocatalytic CO2RR performance profits from highly efficient charge transfer at both the CdS/MOF and MOF/solution interfaces, in between the MOF layer serves as a reaction platform for expediting both the charge and mass kinetics of the triphasic solid-liquid-gas reaction, apart from further protecting the photosensitizer from photo-corrosion. The knowledge gained here can be generalized to guide future design of more efficient hybrid photocatalytic systems. (C) 2021 Elsevier Inc. All rights reserved.
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