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Acid–Base Interaction Enhancing Oxygen Tolerance in Electrocatalytic Carbon Dioxide Reduction
Author(s) -
Li Pengsong,
Lu Xu,
Wu Zishan,
Wu Yueshen,
MalpassEvans Richard,
McKeown Neil B.,
Sun Xiaoming,
Wang Hailiang
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.202003093
Subject(s) - formate , faraday efficiency , aniline , cobalt , catalysis , electrode , selectivity , chemistry , molecule , electrochemical reduction of carbon dioxide , inorganic chemistry , chemical engineering , oxygen , cathode , electrochemistry , carbon monoxide , organic chemistry , engineering
Hybrid electrodes with improved O 2 tolerance and capability of CO 2 conversion into liquid products in the presence of O 2 are presented. Aniline molecules are introduced into the pore structure of a polymer of intrinsic microporosity to expand its gas separation functionality beyond pure physical sieving. The chemical interaction between the acidic CO 2 molecule and the basic amino group of aniline renders enhanced CO 2 separation from O 2 . Loaded with a cobalt phthalocyanine‐based cathode catalyst, the hybrid electrode achieves a CO Faradaic efficiency of 71 % with 10 % O 2 in the CO 2 feed gas. The electrode can still produce CO at an O 2 /CO 2 ratio as high as 9:1. Switching to a Sn‐based catalyst, for the first time O 2 ‐tolerant CO 2 electroreduction to liquid products is realized, generating formate with nearly 100 % selectivity and a current density of 56.7 mA cm −2 in the presence of 5 % O 2 .