Supersonically sprayed rGO/ZIF8 on nickel nanocone substrate for highly stable supercapacitor electrodes

Edmund Samuel, Bhavana Joshi, Chanwoo Park, Ali Aldalbahi, Mostafizur Rahaman, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Reduced graphene oxide (rGO) decorated with dodecahedral ZIF8 was prepared using an easy and cost-effective co-precipitation method and deposited over nickel nanocones by a scalable supersonic cold spraying technique. The structure and morphology of ZIF8 were retained even after post-annealing under argon at 500 °C. Cyclic voltammetry analyses confirmed the excellent electrochemical performance of the rGO/ZIF8 composite, attributed to the dodecahedral structure of ZIF8, high electrical conductivity of rGO, and the nanocone textured substrate. The hierarchical morphology of ZIF8, the rGO nanosheets, and the nanocones (Ni) was confirmed by scanning and transmission electron microscopy. A three-fold enhancement of the specific capacitance (336 F⋅g‒1 at a current density of 1 A⋅g‒1) and long-term cycling performance with 96% retention were achieved after 10,000 cycles. The rGO/ZIF8 Ni-nanocone samples exhibited a high specific energy, capacitance, rate capability, and superior stability in comparison to previously reported supercapacitor electrodes.

Original languageEnglish
Article number137154
JournalElectrochimica Acta
Volume362
DOIs
Publication statusPublished - 2020 Dec 1

Keywords

  • Nickel nanocone
  • Supercapacitor
  • Supersonic cold spraying
  • ZIF8
  • rGO

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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