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Issue 26, 2020
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Supercritical CO2-constructed intralayer [Bi2O2]2+ structural distortion for enhanced CO2 electroreduction

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Abstract

Inducing crystal distortion in two-dimensional (2D) materials to increase the number of active sites is of great significance in improving the intrinsic activity of electrocatalysts for the CO2 reduction reaction (CO2RR). Developing 2D materials as thin as possible is required for this goal. Herein, taking layered BiOCl as a prototype model, we achieved the intralayer [Bi2O2]2+ structural distortion by using supercritical CO2 as a solvent to reduce the number of interlayer chlorine atoms involved in the reaction. Contrary to expectations, further CO2RR experiments indicate that thick nanoplates exhibit a high faradaic efficiency of ∼92% for conversion of CO2 to formate in a wide potential window, whereas ultrathin nanosheets mainly produce H2. Density functional theory calculation shows that increased [Bi2O2]2+ structural distortion in thick nanoplate layers is responsible for the finding. This strategy provides a new route to promoting the intrinsic activity of electrocatalysts, and provides us with a new insight into understanding thickness-dependent activity.

Graphical abstract: Supercritical CO2-constructed intralayer [Bi2O2]2+ structural distortion for enhanced CO2 electroreduction

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Supplementary files

Article information


Submitted
18 Apr 2020
Accepted
16 Jun 2020
First published
17 Jun 2020

J. Mater. Chem. A, 2020,8, 13320-13327
Article type
Paper

Supercritical CO2-constructed intralayer [Bi2O2]2+ structural distortion for enhanced CO2 electroreduction

Y. Zhou, P. Yan, J. Jia, S. Zhang, X. Zheng, L. Zhang, B. Zhang, J. Chen, W. Hao, G. Chen, Q. Xu and B. Han, J. Mater. Chem. A, 2020, 8, 13320
DOI: 10.1039/D0TA04163G

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