Formation of three-dimensional hierarchical pompon-like cobalt phosphide hollow microspheres for asymmetric supercapacitor with improved energy density

Li Ding, Kexiang Zhang, Lin Chen, Zhaozhe Yu, Yunyun Zhao, Guisheng Zhu, Guangcun Chen, Dongliang Yan, Huarui Xu, Aibing Yu

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30 Citations (Scopus)

Abstract

A novel three-dimensional (3D) hierarchical pompon-like CoP hollow microspheres are prepared via a hydrothermal method combined with a subsequent phosphatization treatment. These hollow microspheres present a high specific surface area of roughly 24.6 m 2 g −1 , and a plausible mechanism for their growth is also proposed. The as-obtained materials display an enhanced specific capacitance of 449.4 F g −1 at 1 A g −1 benefited from its unique 3D hierarchical pompon-like hollow structure with a large surface area and high utilization of active materials. Moreover, an asymmetric supercapacitor employing the as-synthesized CoP as the positive electrode and actived carbon (AC) as the negative electrode were successfully assembled, which delivered a high energy density of 22.2 Wh kg −1 at power density of 374.9 W kg −1 with a good cycling performance (80.9% capacitance retention after 3000 cycles). As a practical application test, a unit of three serially-connected ASCs was charged for 15 s and supplied power to, (a) a light emitting diode (LED) and (b) a small LED display screen, each of which worked for more than 35 min and 1 min, respectively. The above results demonstrate that the 3D hierarchical pompon-like CoP hollow microspheres are a promising electrode material for supercapacitor applications.

Original languageEnglish
Pages (from-to)62-71
Number of pages10
JournalElectrochimica Acta
Volume299
DOIs
Publication statusPublished - 10 Mar 2019

Keywords

  • Asymmetric supercapacitor
  • CoP
  • Energy density
  • Hollow microspheres

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