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Bi 2 O 3 Nanosheets Grown on Multi‐Channel Carbon Matrix to Catalyze Efficient CO 2 Electroreduction to HCOOH
Author(s) -
Liu Subiao,
Lu Xue Feng,
Xiao Jing,
Wang Xin,
Lou Xiong Wen David
Publication year - 2019
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.201907674
Subject(s) - overpotential , faraday efficiency , electrolyte , electrocatalyst , materials science , chemical engineering , carbon fibers , adsorption , electron transfer , degradation (telecommunications) , inorganic chemistry , electrode , chemistry , electrochemistry , composite material , telecommunications , composite number , computer science , engineering
Bi 2 O 3 nanosheets were grown on a conductive multiple channel carbon matrix (MCCM) for CO 2 RR. The obtained electrocatalyst shows a desirable partial current density of ca. 17.7 mA cm −2 at a moderate overpotential, and it is highly selective towards HCOOH formation with Faradaic efficiency approaching 90 % in a wide potential window and its maximum value of 93.8 % at −1.256 V. It also exhibits a maximum energy efficiency of 55.3 % at an overpotential of 0.846 V and long‐term stability of 12 h with negligible degradation. The superior performance is attributed to the synergistic contribution of the interwoven MCCM and the hierarchical Bi 2 O 3 nanosheets, where the MCCM provides an accelerated electron transfer, increased CO 2 adsorption, and a high ratio of pyrrolic‐N and pyridinic‐N, while ultrathin Bi 2 O 3 nanosheets offer abundant active sites, lowered contact resistance and work function as well as a shortened diffusion pathway for electrolyte.