• 文献标题:   Ultrahigh energy density asymmetric electrochemical capacitors based on flower-like ZnO/Co3O4 nanobundle arrays and stereotaxically constricted graphene
  • 文献类型:   Article
  • 作  者:   HU N, GONG WH, HUANG L, SHEN PK
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Guangxi Univ
  • 被引频次:   18
  • DOI:   10.1039/c8ta10113b
  • 出版年:   2019

▎ 摘  要

In this study, unique hierarchical flower-like ZnO/Co3O4 nanobundle arrays grown on nickel foam have been synthesized via a facile hydrothermal method. The morphology evolution of the ZnO/Co3O4 nanobundles arrays for different contents and reaction times was investigated in detail. The hierarchical structures of the ZnO/Co3O4 nanobundle arrays have a large contact area with electrolyte, and have the advantage of excellent ion diffusion and good electronic transport. Consequently, when used as supercapacitors, the ZnO/Co3O4 nanobundle array electrodes show remarkable specific capacitance of up to 1983 F g(-1) at a current density of 2 A g(-1) and 833 F g(-1) at a higher current density of 20 A g(-1), and 84.5% of the specific capacitance was still retained at 10 A g(-1) after 5000 cycles. Furthermore, a ZnO/Co3O4 NBs-1//stereotaxically constricted graphene asymmetric supercapacitor device was also produced and was shown to exhibit an ultrahigh energy density of 70.4 W h kg(-1) at a power density of 779.8 W kg(-1). The ZnO/Co3O4 nanobundle electrodes display excellent electrochemical performance, which makes them promising electrode materials for practical application in supercapacitors.