Oxygen Evolution Overpotential of Pb-based Insoluble Anode Containing Ru Oxide Powders Prepared by Liquid-phase Reaction and Heating
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- TAKAHASHI Hiroki
- Department of Materials Science, Graduate School of Engineering Science, Akita University
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- OZAWA Yuuji
- Department of Materials Science, Graduate School of Engineering Science, Akita University
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- OHKUBO Keisuke
- Department of Materials Science, Graduate School of Engineering Science, Akita University
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- TAGUCHI Masami
- Department of Materials Science, Graduate School of Engineering Science, Akita University
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- SUZUKI Kazunari
- Metallurgical Laboratory, DOWA METALS & MINING CO., LTD.
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<p>Ruthenium oxide powders were produced by the reaction of an RuCl3 solution with H2O2, followed by heating of the resulting precursor at a temperature between 200°C and 600°C in air. Pb-based anodes containing these heated products of 1.0 mass% were prepared by the powder-rolling method, and the effect of the heated product as an electrode catalyst on lowering the anode potential was investigated in order to develop an energy-saving insoluble anode for Zn electrowinning. Based on XPS results, RuO2 with a signifi cant amount of RuO2・nH2O was produced by heating the precursor at 250°C or lower. The ratio of RuO2 to RuO2・nH2O increased remarkably above 300°C and the potential of the Pb-based anode decreased in inverse proportion to the RuO2 content of the heated product. The lowest anode potential of 1.72 V vs. NHE, which was about 360 mV lower than that of the anode with the unheated precursor, was observed for the Pb-based anode containing the product heated at 400°C. However, the anode potential of the Pb-based anode increased again when the heating temperature was 500°C or higher. The subsequent increase in the anode potential was probably caused by a decrease in the active sites of the oxygen evolution reaction, that is, the grain growth of the heated product decreased the effective reaction area of the RuO2 catalyst.</p>
収録刊行物
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- International Journal of the Society of Materials Engineering for Resources
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International Journal of the Society of Materials Engineering for Resources 24 (1_2), 6-12, 2020-06-01
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詳細情報 詳細情報について
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- CRID
- 1390851641622322176
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- NII論文ID
- 130008064081
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- NII書誌ID
- AA1095475X
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- ISSN
- 18846629
- 13479725
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- NDL書誌ID
- 032469560
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- 本文言語コード
- en
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- データソース種別
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