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Facile synthesis approach of bifunctional Co-Ni-Fe oxyhydroxide and spinel oxide composite electrocatalysts from hydroxide and layered double hydroxide composite precursors
| Title: | Facile synthesis approach of bifunctional Co-Ni-Fe oxyhydroxide and spinel oxide composite electrocatalysts from hydroxide and layered double hydroxide composite precursors |
| Authors: | Kitano, Sho Browse this author →KAKEN DB | | Sato, Yuki Browse this author | | Tagusari, Reiko Browse this author | | Zhu, Ruijie Browse this author | | Kowalski, Damian Browse this author | | Aoki, Yoshitaka Browse this author →KAKEN DB | | Habazaki, Hiroki Browse this author →KAKEN DB |
| Issue Date: | 4-Apr-2023 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | RSC advances |
| Volume: | 13 |
| Issue: | 16 |
| Start Page: | 10681 |
| End Page: | 10692 |
| Publisher DOI: | 10.1039/d2ra08096f |
| Abstract: | Zinc-air batteries (ZABs) are promising candidates for the next-generation energy storage systems, however, their further development is severely hindered by kinetically sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Facile synthesis approaches of highly active bifunctional electrocatalysts for OER and ORR are required for their practical applications. Herein, we develop a facile synthesis procedure for composite electrocatalysts composed of OER-active metal oxyhydroxide and ORR-active spinel oxide containing Co, Ni and Fe from composite precursors consisting of metal hydroxide and layered double hydroxide (LDH). Both hydroxide and LDH are simultaneously produced by a precipitation method with a controlled molar ratio of Co2+, Ni2+ and Fe3+ in the reaction solution, and calcination of the precursor at a moderate temperature provides composite catalysts of metal oxyhydroxides and spinel oxides. The composite catalyst shows superb bifunctional performances with a small potential difference of 0.64 V between a potential of 1.51 V vs. RHE at 10 mA cm(-2) for OER and a half-wave potential of 0.87 V vs. RHE for ORR. The rechargeable ZAB assembled with the composite catalyst as an air-electrode exhibits a power density of 195 mA cm(-2) and excellent durability of 430 hours (1270 cycles) of a charge-discharge cycle test. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/89299 |
| 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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