2018年5月1日
An efficient catalyst film fabricated by electrophoretic deposition of cobalt hydroxide for electrochemical water oxidation
Journal of Photochemistry and Photobiology A: Chemistry
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- 巻
- 358
- 号
- 開始ページ
- 395
- 終了ページ
- 401
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jphotochem.2017.09.052
- 出版者・発行元
- Elsevier B.V.
The hexagonal-shaped β-Co(OH)2 discs were electrophoretically deposited on an electrode to yield a stably adherent and uniform β-Co(OH)2 layer. The electrocatalytic water oxidation at the β-Co(OH)2 layer-deposited electrode was investigated to seek efficient water oxidation catalyst for artificial photosynthesis as promising energy-providing systems for the future. The β-Co(OH)2 layer did not work as a water oxidation catalyst in a K2SO4 solution at pH 7.0 when applying 1.70 V vs. reversible hydrogen electrode (RHE), although the layer was oxidized to the CoO(OH) layer. In a phosphate buffer solution (pH 7.0), the β-Co(OH)2 layer was dissolved and oxidatively re-deposited as the Co-Pi catalyst (Science, 321 (2008) 1072–1075.) when applying the same potential. While in a Na2B4O7 solution at pH 9.4, the β-Co(OH)2 layer was oxidized to the CoO(OH) layer with the hexagonal-disc-shape remained when applying 1.7 V vs. RHE, and the formed CoO(OH) layer works efficiently for electrocatalytic water oxidation in contrast to no catalytic activity in a K2SO4 solution at pH 9.4. The catalytic performance of the formed CoO(OH) layer was evaluated
the overpotential (η) of 0.42 V for current generation of 100 μA cm−2 and the Tafel slope of 0.21 ∼ 0.29 V dec−1 were provided for water oxidation at pH 9.4, which are comparable with efficient cobalt-based catalyst films reported so far.
the overpotential (η) of 0.42 V for current generation of 100 μA cm−2 and the Tafel slope of 0.21 ∼ 0.29 V dec−1 were provided for water oxidation at pH 9.4, which are comparable with efficient cobalt-based catalyst films reported so far.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jphotochem.2017.09.052
- ISSN : 1010-6030
- SCOPUS ID : 85030655702
- Web of Science ID : WOS:000430883200048