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The effect of anodizing temperature on the oxygen evolution reaction activity of anodized FeNiCo alloy in alkaline electrolyte
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| Title: | The effect of anodizing temperature on the oxygen evolution reaction activity of anodized FeNiCo alloy in alkaline electrolyte |
| Authors: | Nishimoto, Masahiro Browse this author | | Xiong, Zetao Browse this author | | Kitano, Sho Browse this author →KAKEN DB | | Aoki, Yoshitaka Browse this author →KAKEN DB | | Habazaki, Hiroki Browse this author →KAKEN DB |
| Keywords: | Anodizing | | Oxygen evolution reaction | | Oxyhydroxide | | FeNiCo | | Electrocatalyst |
| Issue Date: | 20-Sep-2022 |
| Publisher: | Elsevier |
| Journal Title: | Electrochimica acta |
| Volume: | 427 |
| Start Page: | 140875 |
| Publisher DOI: | 10.1016/j.electacta.2022.140875 |
| Abstract: | This study investigates the oxygen evolution reaction (OER) activity of the FeNiCo alloy anodized at several temperatures in a fluoride-containing ethylene glycol electrolyte. When the alloy is anodized at 10 V, the OER activity in KOH electrolyte is highly enhanced on the alloy anodized at 15 and 20 degrees C, at which non-uniform film growth proceeds. The fraction of the locally thick film regions increases with anodizing time, enhancing the OER activity. Only thin porous films are formed at >= 30 degrees C even though the anodizing current is high because of the promotion of film dissolution at high electrolyte temperatures. Because of the thickness limitation, the OER activity is relatively low when the anodic films are formed at >= 30 degrees C. A good correlation is found between the OER activity and the electric double-layer capacitance; thicker porous anodic films enhance the OER activity. The anodic film formed at each temperature consists of a rutile-type (FeNiCo)F-2 phase, but in KOH electrolyte, it is converted readily to an oxyhydroxide phase, which is OER active. A similar to 2 mu m-thick film obtained under the optimum anodizing condition reduces the overpotential of OER to 245 mV at 10 mA cm(-2) in 1.0 mol dm(-3) KOH electrolyte. |
| Rights: | © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/92804 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 幅崎 浩樹
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