Facilely synthesized honeycomb-like NiCo2O4 nanoflakes with an increased content of oxygen vacancies as an efficient cathode catalyst for Li-O2 batteries

Kefan Song, Xiulan Hu, Wenjie Gao, Zeyu Liu, Handan Qiao, Takahiro Ishizaki, Xiaodong Shen

研究成果: Article査読

抄録

The development of high energy density Li-O2 batteries is restricted by the sluggish kinetics of both the oxygen reduction reaction and the oxygen evolution reaction, and developing an efficient cathode catalyst is the key to resolving this issue. In present study, interconnected honeycomb-like NiCo2O4 nanoflakes are synthesized by facile electrochemical deposition on carbon cloth (CC) and subsequent heat treatment. Compared with NiO and Co3O4, suitably sized NiCo2O4 nanoflakes benefit from a vital synergistic effect of components Co and Ni and are expected to show superior OER/ORR performance. The presence of redox couples Co3+/Co2+ and Ni2+/Ni3+ and abundant oxygen vacancies in NiCo2O4 allow Li-O2 batteries deliver satisfactory cycle durability and high discharge/recharge capacities. Li-O2 batteries that use the NiCo2O4/CC cathodes exhibit high specific discharge capacities of 8388 mA h g−1 and 5238 mA h g−1 at 200 mA g−1 and 400 mA g−1, respectively, and deliver a long lifetime of 102 cycles with a capacity limit of 500 mA h g−1 at 340 mA g−1, thereby suggesting that honeycomb-like NiCo2O4 nanoflakes are a promising cathode catalyst.

本文言語English
論文番号162774
ジャーナルJournal of Alloys and Compounds
898
DOI
出版ステータスPublished - 2022 3月 25

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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