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Boosting Electrochemical Reduction of CO 2 at a Low Overpotential by Amorphous Ag‐Bi‐S‐O Decorated Bi 0 Nanocrystals
Author(s) -
Zhou JunHao,
Yuan Kun,
Zhou Liang,
Guo Yu,
Luo MingYu,
Guo XiaoYan,
Meng QingYuan,
Zhang YaWen
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201908735
Subject(s) - overpotential , formate , amorphous solid , electrochemistry , bimetal , catalysis , materials science , dissociation (chemistry) , inorganic chemistry , electrocatalyst , chemical engineering , chemistry , electrode , crystallography , metallurgy , organic chemistry , engineering
Bimetal‐S‐O composites have been rarely researched in electrochemical reduction of CO 2 . Now, an amorphous Ag‐Bi‐S‐O decorated Bi 0 catalyst derived from Ag 0.95 BiS 0.75 O 3.1 nanorods by electrochemical pre‐treatment was used for catalyzing eCO 2 RR, which exhibited a formate FE of 94.3 % with a formate partial current density of 12.52 mA cm −2 at an overpotential of only 450 mV. This superior performance was attributed to the attached amorphous Ag‐Bi‐S‐O substance. S could be retained in the amorphous region after electrochemical pre‐treatment only in samples derived from metal‐S‐O composites, and it would greatly enhance the formate selectivity by accelerating the dissociation of H 2 O. The existence of Ag would increase the current density, resulting in a higher local pH, which made the role of S in activating H 2 O more significantly and suppressed H 2 evolution more effectively, thus endowing the catalyst with a higher formate FE at low overpotentials.