Facet‐Selective Deposition of Ultrathin Al 2 O 3 on Copper Nanocrystals for Highly Stable CO 2 Electroreduction to Ethylene

Autor: Francesca M. Toma, Guosong Zeng, Xinwei Wang, Scott M. Geyer, Peng Wen, Xiao Ma, Yejun Qiu, Walter S. Drisdell, Peiping Yu, Jinghua Guo, Hui Li, Tao Cheng, Feipeng Yang, Renbo Lei
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie International Edition. 60:24838-24843
ISSN: 1521-3773
1433-7851
Popis: Catalysts based on Cu nanocrystals (NCs) for electrochemical CO2 -to-C2+ conversion with high activity have been a subject of considerable interest, but poor stability and low selectivity for a single C2+ product remain obstacles for realizing sustainable carbon-neutral cycles. Here, we used the facet-selective atomic layer deposition (FS-ALD) technique to selectively cover the (111) surface of Cu NCs with ultrathin Al2 O3 to increase the exposed facet ratio of (100)/(111), resulting in a faradaic efficiency ratio of C2 H4 /CH4 for overcoated Cu NCs 22 times higher than that for pure Cu NCs. Peak performance of the overcoated catalyst (Cu NCs/Al2 O3 -10C) reaches a C2 H4 faradaic efficiency of 60.4 % at a current density of 300 mA cm-2 in 5 M KOH electrolyte, when using a gas diffusion electrode flow cell. Moreover, the Al2 O3 overcoating effectively suppresses the dynamic mobility and the aggregation of Cu NCs, which explains the negligible activity loss and selectivity degradations of Cu NCs/Al2 O3 -10C shown in stability tests.
Databáze: OpenAIRE
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