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Co 3 O 4 Nanowire Arrays toward Superior Water Oxidation Electrocatalysis in Alkaline Media by Surface Amorphization
Author(s) -
Zhou Dan,
He Liangbo,
Zhang Rong,
Hao Shuai,
Hou Xiandeng,
Liu Zhiang,
Du Gu,
Asiri Abdullah M.,
Zheng Chengbin,
Sun Xuping
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703565
Subject(s) - overpotential , electrocatalyst , amorphous solid , catalysis , nanowire , oxide , materials science , layer (electronics) , current density , chemical engineering , inorganic chemistry , nanotechnology , chemistry , electrochemistry , crystallography , metallurgy , electrode , physics , biochemistry , quantum mechanics , engineering
It is highly desirable to develop a simple, fast and straightforward method to boost the alkaline water oxidation of metal oxide catalysts. In this communication, we report our recent finding that the generation of amorphous Co‐borate layer on Co 3 O 4 nanowire arrays supported on Ti mesh (Co 3 O 4 @Co‐Bi NA/TM) leads to significantly boosted OER activity. The as‐prepared Co 3 O 4 @Co‐Bi NA/TM demands overpotential of 304 mV to drive a geometrical current density of 20 mA cm ‐2 in 1.0 M KOH, which is 109 mV less than that for Co 3 O 4 NA/TM, with its catalytic activity being preserved for at least 20 h. It suggests that the existence of amorphous Co‐Bi layer promotes more CoO x (OH) y generation on Co 3 O 4 surface.