SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2024, Vol. 67 ›› Issue (3): 1-8.DOI: 10.1016/j.cjche.2023.11.020

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An effective strategy of constructing multi-metallic oxides of ZnO/CoNiO2/CoO/C microflowers for improved supercapacitive performance

Wei Guo1, Yan Zhang2, Xiaxin Lei1, Shuang Wang2,3,   

  1. 1 College of Physics, Taiyuan University of Technology, Jinzhong 030600, China;
    2 College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China;
    3 Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2023-08-24 Revised:2023-11-03 Online:2024-06-01 Published:2024-03-28
  • Contact: Shuang Wang,E-mail address:wangshuang@tyut.edu.cn.
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (22078215) and Research Project by Shanxi Scholarship Council of China (2021-055).

An effective strategy of constructing multi-metallic oxides of ZnO/CoNiO2/CoO/C microflowers for improved supercapacitive performance

Wei Guo1, Yan Zhang2, Xiaxin Lei1, Shuang Wang2,3,   

  1. 1 College of Physics, Taiyuan University of Technology, Jinzhong 030600, China;
    2 College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China;
    3 Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China
  • 通讯作者: Shuang Wang,E-mail address:wangshuang@tyut.edu.cn.
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (22078215) and Research Project by Shanxi Scholarship Council of China (2021-055).

Abstract: In this work, a new ZnO/CoNiO2/CoO/C metal oxides composite is prepared by cost-effective hydrothermal method coupled with annealing process under N2 atmosphere. Notably, the oxidation-defect annealing environment is conducive to both morphology and component of the composite, which flower-like ZnO/CoNiO2/CoO/C is obtained. Benefited from good chemical stability of ZnO, high energy capacity of CoNiO2 and CoO and good conductivity of C, the as-prepared sample shows promising electrochemical behavior, including the specific capacity of 1435 C·g-1 at 1 A·g-1, capacity retention of 87.3% at 20 A·g-1, and cycling stability of 90.5% for 3000 cycles at 5 A·g-1, respectively. Furthermore, the prepared ZnO/CoNiO2/CoO/C/NF//AC aqueous hybrid supercapacitors device delivers the best specific energy of 55.9 W·h·kg-1 at 850 W·kg-1. The results reflect that the as-prepared ZnO/CoNiO2/CoO/C microflowers are considered as high performance electrode materials for supercapacitor, and the strategy mentioned in this paper is benefit to prepare mixed metal oxides composite for energy conversion and storage.

Key words: Composites, Electrochemistry, Hydrothermal, Transition metal oxides, Structural control, Supercapacitors

摘要: In this work, a new ZnO/CoNiO2/CoO/C metal oxides composite is prepared by cost-effective hydrothermal method coupled with annealing process under N2 atmosphere. Notably, the oxidation-defect annealing environment is conducive to both morphology and component of the composite, which flower-like ZnO/CoNiO2/CoO/C is obtained. Benefited from good chemical stability of ZnO, high energy capacity of CoNiO2 and CoO and good conductivity of C, the as-prepared sample shows promising electrochemical behavior, including the specific capacity of 1435 C·g-1 at 1 A·g-1, capacity retention of 87.3% at 20 A·g-1, and cycling stability of 90.5% for 3000 cycles at 5 A·g-1, respectively. Furthermore, the prepared ZnO/CoNiO2/CoO/C/NF//AC aqueous hybrid supercapacitors device delivers the best specific energy of 55.9 W·h·kg-1 at 850 W·kg-1. The results reflect that the as-prepared ZnO/CoNiO2/CoO/C microflowers are considered as high performance electrode materials for supercapacitor, and the strategy mentioned in this paper is benefit to prepare mixed metal oxides composite for energy conversion and storage.

关键词: Composites, Electrochemistry, Hydrothermal, Transition metal oxides, Structural control, Supercapacitors