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In Situ Formation of Efficient Cobalt‐Based Water Oxidation Catalysts from Co 2+ ‐Containing Tungstate and Molybdate Solutions
Author(s) -
Zhang Biaobiao,
Wu Xiujuan,
Li Fei,
Yu Fengshou,
Wang Yong,
Sun Licheng
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500099
Subject(s) - tungstate , cobalt , molybdate , aqueous solution , materials science , inorganic chemistry , catalysis , amorphous solid , cobalt oxide , electrolysis , oxide , bimetallic strip , sodium tungstate , reversible hydrogen electrode , electrode , metal , electrochemistry , tungsten , chemistry , working electrode , metallurgy , electrolyte , biochemistry , organic chemistry
Replacing rare and expensive noble‐metal catalysts with inexpensive and earth‐abundant ones is of great importance to split water either electrochemically or photoelectrochemically. In this study, two amorphous cobalt oxide catalysts (Co−W film and Co−Mo film) with high activity for electrocatalytic water oxidation were prepared by fast, simple electrodeposition from aqueous solutions of Na 2 WO 4 and Na 2 MoO 4 containing Co 2+ . In solutions of Na 2 WO 4 and Na 2 MoO 4 , sustained anodic current densities up to 1.45 and 0.95 mA cm −2 were obtained for Co−W film at 1.87 V versus a reversible hydrogen electrode (RHE) and Co−Mo film on fluorine‐doped tin oxide (FTO) substrates at 1.85 V versus RHE. For the Co−W film, a much higher current density of 4.5 mA cm −2 was acquired by using a stainless‐steel mesh as the electrode substrate. Significantly, in long‐term electrolysis for 13 h, the Co−W film exhibited improved stability in cobalt‐free buffer solution in comparison with the previously reported Co−Pi film.