Ingenious construction of hierarchical spherical nanostructures by in-situ confining Ni–Co–Mn hydroxide nanosheets inside/outside hollow carbon nanospheres for high-performance hybrid supercapacitors

Yan Zhou, Zixin Jia, Yiting Shen, Liyuan Wei, Siyuan Zhao, Yingying Han, Peng Chen, Chang Xu, Xiangmei Cui, Jingwen Sun, Xiaoping Ouyang, Xin Wang, Junwu Zhu, Shugang Pan, Yongsheng Fu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Although the hollow nanostructures as supercapacitor electrodes possess great advantages, the huge interior void seriously hindered the enhancement of volumetric power and energy densities. In this work, a hierarchical spherical nanostructure has been successfully designed and constructed by confining Ni–Co–Mn hydroxide nanosheets inside/outside hollow carbon nanospheres. The hollow carbon nanospheres show unique spatial confinement effect and surface-confined effect, which can well control the size of the Ni–Co–Mn hydroxide nanosheets about 340 nm encapsulated inside hollow carbon nanospheres as well as the thickness of Ni–Co–Mn hydroxide nanosheets (~13 nm) wrapped outside hollow carbon nanospheres. This ingenious hierarchical spherical nanostructure significantly enhanced the electrical conductivity and structural stability of Ni–Co–Mn hydroxide nanosheets as well as the packing density of electrode materials. Benefiting from the structural and compositional features, the as-obtained electrode achieves a high volumetric capacity (1455.2 C cm−3), favorable rate performance, and long cycle life. Impressively, the assembled hybrid supercapacitor device shows a high specific energy of 44.9 Wh kg−1 at the 793.5 W kg−1 and a high capacitance retention ratio of 91.8% after 10,000 cycles.

Original languageEnglish
Article number102380
JournalJournal of Energy Storage
Volume36
DOIs
StatePublished - 1 Apr 2021
Externally publishedYes

Keywords

  • Confined growth
  • Hollow carbon nanospheres
  • Hybrid supercapacitors
  • Ni–Co–Mn hydroxide nanosheets
  • Volumetric capacity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Ingenious construction of hierarchical spherical nanostructures by in-situ confining Ni–Co–Mn hydroxide nanosheets inside/outside hollow carbon nanospheres for high-performance hybrid supercapacitors'. Together they form a unique fingerprint.

Cite this