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The Aurivillius Compound CoBi 2 O 2 F 4 – an Efficient Catalyst for Electrolytic Water Oxidation after Liquid Exfoliation
Author(s) -
Yu Xiaowen,
MitoudiVagourdi Eleni,
Johnsson Mats
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901561
Subject(s) - tafel equation , catalysis , overpotential , oxygen evolution , inorganic chemistry , chemistry , exfoliation joint , adsorption , aurivillius , chemical engineering , materials science , electrochemistry , electrode , graphene , nanotechnology , organic chemistry , optoelectronics , dielectric , engineering , ferroelectricity
Investigation of new high‐efficiency catalysts for the oxygen evolution reaction (OER) is important for propelling the practical applications of water splitting. Here we report the Aurivillius compound CoBi 2 O 2 F 4 to be a novel catalyst for catalytic OER. After liquid exfoliation of CoBi 2 O 2 F 4 crystals in isopropanol, the resulting thin sheets deliver a low overpotential of 334 mV and a small Tafel slope of 47 mV dec −1 for catalytic OER, exhibiting substantially higher activity and faster kinetics compared with as‐synthesized crystals. This attributes to the increase in accessible surface area and dangling bonds on the edges providing more active sites exposed on the surface after exfoliation. The positive effects of F − anions to benefit OH − adsorption/combination and p ‐block Bi 3+ cations to direct reactants to preferred sites are proposed to synergistically improve the Co‐active centers for catalysis; based on this, the OER reaction mechanism on this new catalyst is discussed.