Boosting electrocatalytic CO₂–to–ethanol production via asymmetric C–C coupling
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Date
2022
Authors
Wang, P.
Yang, H.
Tang, C.
Wu, Y.
Zheng, Y.
Cheng, T.
Davey, K.
Huang, X.
Qiao, S.-Z.
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Nature Communications, 2022; 13(1)
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Pengtang Wang, Hao Yang, Cheng Tang, Yu Wu, Yao Zheng, Tao Cheng, Kenneth Davey, Xiaoqing Huang, Shi-Zhang Qiao
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Abstract
Electroreduction of carbon dioxide (CO₂) into multicarbon products provides possibility of large-scale chemicals production and is therefore of significant research and commercial interest. However, the production efficiency for ethanol (EtOH), a significant chemical feedstock, is impractically low because of limited selectivity, especially under high current operation. Here we report a new silver–modified copper–oxide catalyst (dCu₂O/Ag2.3%) that exhibits a significant Faradaic efficiency of 40.8% and energy efficiency of 22.3% for boosted EtOH production. Importantly, it achieves CO₂–to–ethanol conversion under high current operation with partial current density of 326.4 mA cm–² at −0.87 V vs reversible hydrogen electrode to rank highly significantly amongst reported Cu–based catalysts. Based on in situ spectra studies we show that significantly boosted production results from tailored introduction of Ag to optimize the coordinated number and oxide state of surface Cu sites, in which the *CO adsorption is steered as both atop and bridge configuration to trigger asymmetric C–C coupling for stablization of EtOH intermediates.
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© The Author(s) 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/.