能源化学(英文版) ›› 2019, Vol. 38 ›› Issue (11): 34-40.DOI: 10.1016/j.jechem.2019.01.001

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Rechargeable Zn-air batteries initiated by nickel-cobalt bimetallic selenide

Changqi Suna,c, Xiaosong Guob, Jingyan Zhangc, Genliang Hana, Daqiang Gaoc, Xiaoping Gaoa   

  1. a Key Laboratory of Sensor and Sensing Technology, Gansu Academy of Sciences, Lanzhou 730000, Gansu, China;
    b College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China;
    c Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, Gansu, China
  • 收稿日期:2018-10-29 修回日期:2019-01-07 出版日期:2019-11-15 发布日期:2020-12-18
  • 通讯作者: Daqiang Gao, gaodq@lzu.edu.cn; Xiaoping Gao, gao_xp02@163.com
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (Grant nos. 11474137), the Fundamental Research Funds for the Central Universities (Grant nos. LZUMMM2018017, lzujbky-2018-121), Key Research and Development Plan of Gansu Province (No. 18YF1GA088) and Scientific research project of colleges and universities in gansu province (No. 2018A-205).

Rechargeable Zn-air batteries initiated by nickel-cobalt bimetallic selenide

Changqi Suna,c, Xiaosong Guob, Jingyan Zhangc, Genliang Hana, Daqiang Gaoc, Xiaoping Gaoa   

  1. a Key Laboratory of Sensor and Sensing Technology, Gansu Academy of Sciences, Lanzhou 730000, Gansu, China;
    b College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China;
    c Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, Gansu, China
  • Received:2018-10-29 Revised:2019-01-07 Online:2019-11-15 Published:2020-12-18
  • Contact: Daqiang Gao, gaodq@lzu.edu.cn; Xiaoping Gao, gao_xp02@163.com
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (Grant nos. 11474137), the Fundamental Research Funds for the Central Universities (Grant nos. LZUMMM2018017, lzujbky-2018-121), Key Research and Development Plan of Gansu Province (No. 18YF1GA088) and Scientific research project of colleges and universities in gansu province (No. 2018A-205).

摘要: A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the development of Zn-air batteries. In this work, porous (Ni,Co)Se2 nanosheets were synthesized by selenizing NiCo2O4 nanosheets. By regulating the conductivity and morphology of the sample, the prepared porous (Ni,Co)Se2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to NiCo2O4 nanosheets. The aqueous Zn-air battery using porous (Ni,Co)Se2 nanosheets as the air cathode exhibits superior charge and discharge performance (1.98 V for charging and 1.17 V for discharging), high specific capacity (770 mAh/g), and excellent cycle stability (140 h). These results indicate that the porous (Ni,Co)Se2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries.

关键词: Electrocatalyst, Zn-air batteries, Oxygen evolution reaction, Oxygen reduction reaction

Abstract: A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the development of Zn-air batteries. In this work, porous (Ni,Co)Se2 nanosheets were synthesized by selenizing NiCo2O4 nanosheets. By regulating the conductivity and morphology of the sample, the prepared porous (Ni,Co)Se2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to NiCo2O4 nanosheets. The aqueous Zn-air battery using porous (Ni,Co)Se2 nanosheets as the air cathode exhibits superior charge and discharge performance (1.98 V for charging and 1.17 V for discharging), high specific capacity (770 mAh/g), and excellent cycle stability (140 h). These results indicate that the porous (Ni,Co)Se2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries.

Key words: Electrocatalyst, Zn-air batteries, Oxygen evolution reaction, Oxygen reduction reaction