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Electrochemical Transformation of Facet‐Controlled BiOI into Mesoporous Bismuth Nanosheets for Selective Electrocatalytic Reduction of CO 2 to Formic Acid
Author(s) -
Wu Dan,
Liu Jianwen,
Liang Yue,
Xiang Kun,
Fu XianZhu,
Luo JingLi
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901724
Subject(s) - tafel equation , mesoporous material , nanosheet , materials science , formic acid , electrochemistry , faraday efficiency , electrocatalyst , bismuth , chemical engineering , inorganic chemistry , catalysis , nanotechnology , electrode , chemistry , organic chemistry , engineering , metallurgy
Mesoporous bismuth nanosheets are prepared through electrochemical transformation of (100)‐facet exposed BiOI. Theoretical modeling and calculations are used to simulate the in situ morphological transformation of BiOI into Bi. Mesoporous Bi nanosheets show superior electrochemical CO 2 reduction performance. A faradaic efficiency of 95.9 % at −0.77 V RHE for the conversion of CO 2 into formic acid, is achieved for the mesoporous Bi nanosheet catalyst compared with 93.8 % at −0.87 V RHE for the smooth Bi nanosheets. Tafel analysis and DFT calculations indicate that the electrochemical CO 2 reduction on mesoporous Bi nanosheets is kinetically faster with a higher resistance to H 2 generation than that on smooth Bi(001) nanosheets. The CO 2 ‐to‐HCOOH pathway is preferred through formation of an *OCHO intermediate on the (012) and (001) planes of Bi. The mesoporous structure induces a more accessible interaction with CO 2 , which makes a predominant contribution to the enhanced performance compared with the subsequent CO 2 activation on different facets of Bi.