Volume 62, Issue 38 e202309443
Research Article

Electronic Interactions on Platinum/(Metal-Oxide)-Based Photocatalysts Boost Selective Photoreduction of CO2 to CH4

Peng Liu

Peng Liu

School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

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Yu-Long Men

Corresponding Author

Yu-Long Men

Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

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Xin-Yu Meng

Xin-Yu Meng

Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

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Prof. Chong Peng

Corresponding Author

Prof. Chong Peng

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 116024 Dalian, Liaoning, P. R. China

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Yiyi Zhao

Yiyi Zhao

Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

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Prof. Yun-Xiang Pan

Corresponding Author

Prof. Yun-Xiang Pan

School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China

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First published: 31 July 2023
Citations: 11

Graphical Abstract

Selective photoreduction of CO2 to CH4, with a CH4 selectivity of 100 %, is achieved on a CdS/Pt/In2O3 photocatalyst. Electronic Pt−In2O3 interactions are beneficial for charge separation and CO2 conversion to CO2δ−, which can be easily hydrogenated into CH4. The enhancement effect of electronic Pt-(metal-oxide) interactions on selective photoreduction of CO2 to CH4 may extend to other common Pt/(metal-oxide)-based photocatalysts.

Abstract

By supporting platinum (Pt) and cadmium sulfide (CdS) nanoparticles on indium oxide (In2O3), we fabricated a CdS/Pt/In2O3 photocatalyst. Selective photoreduction of carbon dioxide (CO2) to methane (CH4) was achieved on CdS/Pt/In2O3 with electronic Pt−In2O3 interactions, with CH4 selectivity reaching to 100 %, which is higher than that on CdS/Pt/In2O3 without electronic Pt−In2O3 interactions (71.7 %). Moreover, the enhancement effect of electronic Pt-(metal-oxide) interactions on selective photoreduction of CO2 to CH4 also occurs by using other common metal oxides, such as photocatalyst supports, including titanium oxide, gallium oxide, zinc oxide, and tungsten oxide. The electronic Pt-(metal-oxide) interactions separate photogenerated electron-hole pairs and convert CO2 into CO2δ−, which can be easily hydrogenated into CH4 via a CO2δ−→HCOO*→HCO*→CH*→CH4 path, thus boosting selective photoreduction of CO2 to CH4. This offers a new way to achieve selective photoreduction of CO2.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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