期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 14, 页码 6524-6531出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta13774b
关键词
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资金
- National Key R&D Program of China [2017YFA0207203]
- National Natural Science Foundation of China [21773050]
- Harbin Distinguished Young Scholars Fund [2017RAYXJ024]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2017DX05]
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology [2017KM006]
Indium oxide (In2O3)-based photocatalysts have great potential in photocatalytic CO2 reduction. Nevertheless, their photocatalytic activity is inhibited by rapid electron-hole recombination. Hence, a novel Z-scheme ternary hierarchical ZnFe2O4/RGO/In2O3 photocatalyst is fabricated for photocatalytic conversion of CO2 to CO and CH4. The CO production rate reaches up to 35.4 mmol g(-1) under 4 h of illumination using a 20ZFO/10RGO/IO catalyst, which is 3.9 times and 9.8 times higher than those using bare In2O3 and bare ZnFe2O4, respectively. The CH4 production rate is 7.8 mmol g(-1), which is 4.3 fold and 2.4 fold higher, respectively, compared to those from bare In2O3 and bare ZnFe2O4. The enhancement of photocatalytic CO2 reduction was ascribed to a Z-scheme mechanism of the hierarchical catalysts by introducing RGO in-between In2O3 and ZnFe2O4 to promote charge separation and realize efficient utilization of the high-energy electrons and holes. The oxygen-defect of ZnFe2O4 also facilitates the adsorption and activation of CO2. This work provides new insights to design ternary In2O3-based hierarchical photocatalysts with a rational Z-scheme photocatalytic mechanism to improve the CO2 conversion efficiency.
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