title: In Situ Formation of Efficient Cobalt-Based Water Oxidation Catalysts from Co(2+)-Containing Tungstate and Molybdate Solutions.
abstract: 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 Na2WO4 and Na2MoO4 containing Co(2+). In solutions of Na2WO4 and Na2MoO4, 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.
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China.
authors.forename: Biaobiao
authors.initials: B
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China.
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China. lifei@dlut.edu.cn.
authors.forename: Fei
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China.
authors.forename: Fengshou
authors.initials: F
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024, Dalian, P.R. China.|Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), 10044, Stockholm, Sweden.
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
keywords: cobalt; heterogeneous catalysis; molybdenum; tungsten; water splitting