期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 539, 期 -, 页码 194-202出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.12.022
关键词
TiO2; Hollow structures; Mass transport; Photocatalysis; CO2 reduction
资金
- National Natural Science Foundation of China [61176004, 61204078, U1304505, 21671059, 51772078]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-17R36]
- Innovation Scientists and Technicians Troop Construction Projects of Henan Province [154200510009]
- Program for Innovative Research Team and Individuals (in Science and Technology) in University of Henan Province [181RTSTHN002, 15HASTIT006, 18HASTIT015]
TiO2 microsphere with tunable pore and chamber size are prepared by a simple solventhermal method and used as catalyst for the photocatalytic CO(2 )reduction. It is found that the hollow microsphere with relative lower surface area of 73.8 m(2 )g(-1) exhibits increased pore size of 18.1 nm and cavity structure, leading to higher CO2 diffusion coefficient of 5.40 x 10(-5) cm(2) s(-1) compared with the solid and yolk/shell microspheres. Therefore, the hollow microsphere possesses more accessible sites for CO2 adsorption, which finally gives rise to the enhanced CO production rate of 10.9 +/- 0.7 mu mol g(-1) h(-1) under simulated sunlight, which is respectively 1.6 and 1.4 times higher than that of solid and yolk/shell microspheres. Electron dynamic study further demonstrates that hollow microsphere shows the highest photocurrent density and the lowest charge recombination among three microspheres structure, which is attributed to the swift CO2 diffusion providing fresh CO(2 )molecules to rapidly scavenge the photo-generated electrons and finally leading to the excellence catalytic reduction performances. This method could be adopted as a general strategy to prepare high performance TiO(2 )catalysts with desirable structural qualities for the photocatalytic CO2 reduction under nature sunlight. (C) 2018 Elsevier Inc. All rights reserved.
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