Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 10, Issue 10, Pages 2228-2233Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201500099
Keywords
cobalt; heterogeneous catalysis; molybdenum; tungsten; water splitting
Categories
Funding
- National Natural Science Foundation of China [21476043, 21120102036, 21361130020]
- National Basic Research Program of China (973 program) [2014CB239402]
- Fundamental Research Funds for the Central Universities [DUT14YQ104]
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Replacing rare and expensive noble-metal catalysts with inexpensive and earth-abundant ones is of great importance to split water either electrochemically or photo-electrochemically. 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 Co2+. In solutions of Na2WO4 and Na2MoO4, sustained anodic current densities up to 1.45 and 0.95 mAcm(-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 1.85V versus RHE. For the Co-W film, a much higher current density of 4.5 mAcm(-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.
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