Highly Selective CO 2 Electroreduction to C 2+ Products over Cu 2 O-Decorated 2D Metal-Organic Frameworks with Rich Heterogeneous Interfaces

• Published in: Nano letters Vol. 23; no. 4; pp. 1474 - 1480
• Main Authors: Liu, Chang, Wang, Mingmin, Ye, Jinyu, Liu, Liangbin, Li, Leigang, Li, Yunhua, Huang, Xiaoqing
• Format: Journal Article
• Language: English
• Published: United States 22.02.2023
• Subjects: Cu-based catalysts; heterogeneous interfaces; stability; eCO2RR; two-dimensional metal−organic frameworks
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.2c04911

The electroreduction of carbon dioxide into high-value-added products is an effective approach to alleviating the energy crisis and pollution issues. However, there are still significant challenges for multicarbon (C ) product production due to the lack of efficient catalysts with high selectivity. Herein, a Cu-rich electrocatalyst, where Cu O nanoparticles are decorated on two-dimensional (2D) Cu-BDC metal-organic frameworks (MOFs) with abundant heterogeneous interfaces, is synthesized for highly selective CO electroreduction into C products. A high C Faradaic efficiency of 72.1% in an H-type cell and 58.2% in a flow cell are obtained, respectively. The heterogeneous interfaces of Cu O/Cu-BDC can optimize the adsorption energy of reaction intermediates during CO electroreduction. An in situ infrared spectroscopy study indicates that the constructed interfaces can maintain the particular distribution of Cu valence states, where the C-C coupling is promoted to efficiently produce C products owing to the stabilization of *CHO and *COH intermediates.