Volume 134, Issue 7 e202114080
Forschungsartikel

The Crystal Plane is not the Key Factor for CO2-to-Methane Electrosynthesis on Reconstructed Cu2O Microparticles

Dr. Bangwei Deng

Dr. Bangwei Deng

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

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Dr. Ming Huang

Dr. Ming Huang

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, 637457 Singapore, Singapore

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Kanglu Li

Kanglu Li

College of Architecture and Environment, Sichuan University, Chengdu, 610065 P.R. China

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Dr. Xiaoli Zhao

Dr. Xiaoli Zhao

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

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Qin Geng

Qin Geng

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

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Dr. Si Chen

Dr. Si Chen

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

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Dr. Hongtao Xie

Dr. Hongtao Xie

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

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Xing'an Dong

Xing'an Dong

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

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Hong Wang

Hong Wang

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

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Prof. Dr. Fan Dong

Corresponding Author

Prof. Dr. Fan Dong

Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731 P.R. China

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P.R. China

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First published: 09 December 2021
Citations: 2

Abstract

Cu2O microparticles with controllable crystal planes and relatively high stability have been recognized as a good platform to understand the mechanism of the electrocatalytic CO2 reduction reaction (CO2RR). Herein, we demonstrate that the in situ generated Cu2O/Cu interface plays a key role in determining the selectivity of methane formation, rather than the initial crystal plane of the reconstructed Cu2O microparticles. Experimental results indicate that the methane evolution is dominated on all three different crystal planes with similar Tafel slopes and long-term stabilities. Density functional theory (DFT) calculations further reveal that *CO is protonated via a similar bridge configuration at the Cu2O/Cu interface, regardless of the initial crystal planes of Cu2O. The Gibbs free energy changes (ΔG) of *CHO on different reconstructed Cu2O planes are close and more negative than that of *OCCOH, indicating the methane formation is more favorable than ethylene on all Cu2O crystal planes.

Conflict of interest

The authors declare no conflict of interest.

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