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Electrochemical Reduction of CO 2 to Ethane through Stabilization of an Ethoxy Intermediate
Author(s) -
Vasileff Anthony,
Zhu Yanping,
Zhi Xing,
Zhao Yongqiang,
Ge Lei,
Chen Hao Ming,
Zheng Yao,
Qiao ShiZhang
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004846
Subject(s) - chemistry , selectivity , electrochemistry , copper , inorganic chemistry , ethylene , iodide , alkoxy group , raman spectroscopy , reaction mechanism , methane , redox , catalysis , photochemistry , electrode , organic chemistry , alkyl , physics , optics
Electrochemical conversion of CO 2 into ethane is seldom observed because of the generally higher selectivity towards methane, ethylene, and ethanol. Consequently, little experimental evidence for its reaction mechanism exists and thus remains largely unknown. Now, by combining electrochemistry with in situ X‐ray absorption fine‐structure and in situ Raman techniques, iodide‐derived copper (ID‐Cu) and oxide‐derived copper (OD‐Cu) systems were studied to obtain a deeper understanding of the CO 2 to ethane mechanism. With trace iodine species on the surface and positively charged Cu species, production of ethane is significantly more favored on ID‐Cu compared to OD‐Cu, with higher selectivity and faster kinetics. For the first time, it is experimentally found that the formation of ethane follows the same pathway to ethylene and ethanol, and better stabilization of the late stage ethoxy intermediate can steer the reaction to ethane over ethanol.