Journal
CARBON
Volume 168, Issue -, Pages 528-535Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.06.088
Keywords
CO2 electroreduction; Scalable production; Cu single-atoms; CO2-to-CO conversion
Funding
- National Natural Science Foundation of China [51672186, 21908090]
- Natural Science Foundation of Jiangxi Province [20192ACB21015]
- Nanchang University
- Arizona State University
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Developing efficient, selective, and stable single-atom electrocatalysts for CO2 reduction reaction (CO2RR) is attractive but still remains a challenging, especially for scalable production with low-cost. Among the non-precious metal single-atom electrocatalysts, Cu single-atom electrocatalysts are rarely explored for the efficient CO2-to-CO conversion. Herein, we reported a facile and scalable strategy to prepare the Cu single-atom catalyst (Cu SAs/NC) with exceptional CO production performances. Atomically dispersed Cu-N-4 moieties are unambiguously verified by HAADF-STEM and XANES measurements. The as-prepared Cu SAs/NC catalyst delivers a high CO faradaic efficiency of 92% at -0.7 V-RHE as well as the excellent durability over 30 h successive electrolysis. It should be noted that this is one of the rare examples of efficient CO production on Cu single-atom electrocatalyst. Besides, the 20-g + samples can be readily fabricated in one batch and exhibit the almost identical CO2RR performances. Furthermore, the combined experimental and theoretical calculation results identify the genuine active Cu-N-4 sites are responsible for the high selectivity and efficiency of CO production. This work provides a novel strategy for scalable single-atom electrocatalysts in stable quality and offers new insights into the efficient CO2-to-CO conversion on Cu single-atom electrocatalyst. (C) 2020 Elsevier Ltd. All rights reserved.
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