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Research Article

Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution

Lifei Liu1,2, Jianling Zhang1,2,3(), Xiuniang Tan1,2, Bingxing Zhang1,2, Jinbiao Shi1,2, Xiuyan Cheng1,2, Dongxing Tan1,2, Buxing Han1,2,3, Lirong Zheng4, Fanyu Zhang1,2
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Physical Science Laboratory, Huairou National Comprehensive Science Center, Beijing 101400, China
Beijing Synchrotron Radiation Facility (BSRF), Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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Abstract

To construct the heterojunctions of TiO2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic performance. Here we propose the construction of TiO2/covalent organic framework (COF) heterojunction with tight connection by a supercritical CO2 (SC CO2) method, which helps bridging the transformation paths for photo-induced charge between TiO2 and COF. The produced TiO2/COF heterojunction performs a H2 evolution of 3,962 μmol·g-1·h-1 under visible-light irradiation, which is ~ 25 times higher than that of pure TiO2 and 4.5 folds higher than that of TiO2/COF synthesized by the conventional solvothermal method. This study opens up new possibilities for constructing heterojunctions for solar energy utilization.

Keywords

supercritical CO2covalent organic framework (COF)TiO2H2 productionvisible light

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Nano Research
Volume 13 Issue 4,
April 2020
Pages 983-988
DOI: 10.1007/s12274-020-2728-6
Cite this article:
Liu L, Zhang J, Tan X, et al. Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution. Nano Research, 2020, 13(4): 983-988. https://doi.org/10.1007/s12274-020-2728-6
Topics:
Carbon dioxideEnergy utilizationHeterojunctionsHydrogen productionPhotocatalytic activity Solar energyTitanium Dioxide
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