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Understanding Structure‐activity Relationship on Metal‐Organic‐Framework‐Derived Catalyst for CO 2 Electroreduction to C 2 Products
Author(s) -
Han Yunxi,
Zhu Shuaikang,
Xu Shuang,
Niu Xiaopo,
Xu Zhihong,
Zhao Rong,
Wang Qingfa
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100942
Subject(s) - catalysis , electrochemistry , metal organic framework , materials science , faraday efficiency , metal , chemical engineering , electrode , selectivity , carbon fibers , chemistry , composite material , metallurgy , organic chemistry , adsorption , composite number , engineering
Metal‐organic frameworks (MOFs) have been widely studied for electrochemical CO 2 reduction reaction (CO 2 RR). However, the application of negative potential tends to trigger its structural reconstruction and component alteration. It is of great significance to study the relationship between the structural evolution of MOF‐derived materials and product selectivity under the reaction conditions. Herein, we fabricate a HKUST‐1 thin film on carbon fiber paper by a facile electrodeposition approach to investigate the variation of CO 2 RR activity with HKUST‐1 structural reconstruction. During the CO 2 RR process, the HKUST‐1 reconstructs into two structures successively over time: 3D nanospheres composed of numerous small fragments and 3D nano‐network composed of cross‐linked nanobelts in different directions. The former shows a better catalytic activity due to more active sites, lower charge transfer resistance and higher Cu + /Cu 0 ratio. The optimum Faradaic efficiency (FE) of C 2 products (ethylene and ethanol) reaches 58.6 % at −0.98 V versus reversible hydrogen electrode (RHE).