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A Z-scheme ZnFe2O4/RGO/In2O3 hierarchical photocatalyst for efficient CO2 reduction enhancement

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Abstract

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 μmol 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 μmol 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.

Graphical abstract: A Z-scheme ZnFe2O4/RGO/In2O3 hierarchical photocatalyst for efficient CO2 reduction enhancement

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Supplementary files

Article information


Submitted
16 Dec 2019
Accepted
20 Feb 2020
First published
20 Feb 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

A Z-scheme ZnFe2O4/RGO/In2O3 hierarchical photocatalyst for efficient CO2 reduction enhancement

J. Li, F. Wei, C. Dong, W. Mu and X. Han, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13774B

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