Tuning the Microenvironment in Monolayer MgAl Layered Double Hydroxide for CO2-to-Ethylene Electrocatalysis in Neutral Media

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Xu, Yi Ning
Li, Wenjing
Fu, Huai Qin
Zhang, Xin Yu
Zhao, Jia Yue
Wu, Xuefeng
Yuan, Hai Yang
Zhu, Minghui
Dai, Sheng
Liu, Peng Fei
Yang, Hua Gui
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2023
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Abstract

The electrocatalytic reduction of carbon dioxide provides a feasibility to achieve a carbon-neutral energy cycle. However, there are a number of bottleneck issues to be resolved before industrial application, such as the low conversion efficiency, selectivity and reaction rate, etc. Engineering local environment is a critical way to address these challenges. Here, a monolayer MgAl-LDH was proposed to optimize the local environment of Cu for stimulating industrial-current-density CO2-to-C2H4 electroreduction in neutral media. In situ spectroscopic results and theoretical study demonstrated that the Cu electrode modified by MgAl-LDH (MgAl-LDH/Cu) displayed a much higher surface pH value compared to the bare Cu, which could be attributed to the decreased energy barrier for hydrolysis on MgAl-LDH sites with more OH− ions on the surface of the electrode. As a result, MgAl-LDH/Cu achieved a C2H4 Faradaic efficiency of 55.1 % at a current density up to 300 mA cm−2 in 1.0 M KHCO3 electrolyte.

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Angewandte Chemie International Edition

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62

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19

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Chemical sciences

Science & Technology

Physical Sciences

Chemistry, Multidisciplinary

Chemistry

CO2 Electrocatalysis

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Xu, YN; Li, W; Fu, HQ; Zhang, XY; Zhao, JY; Wu, X; Yuan, HY; Zhu, M; Dai, S; Liu, PF; Yang, HG, Tuning the Microenvironment in Monolayer MgAl Layered Double Hydroxide for CO2-to-Ethylene Electrocatalysis in Neutral Media, Angewandte Chemie International Edition, 2023, 62 (19), pp. e202217296

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