Microflower-like nickel sulfide-lead sulfide hierarchical composites as binder-free electrodes for high-performance supercapacitors

Cheol Hwan Mun, Chandu V.V. Muralee Gopi, Rajangam Vinodh, Sangaraju Sambasivam, Ihab M. Obaidat, Hee Je Kim

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Nickel sulfide (NiS), lead sulfide (PbS) and composite of NiS-PbS hybrid are deposited onto nickel (Ni) foam current collector via a simple and cost-effective chemical bath deposition route and utilized as a binder-free battery-type electrode materials for supercapacitor applications. High-performance NiS and highly-stable PbS electrodes are rationally designed to develop a new class NiS-PbS electroactive material. Surface morphological and structural studies indicate that the NiS-PbS composite exhibits a beautiful morphology of nanosheet based microflower structures. Such hierarchical microflower structures provide abundant Faradic active sites and enable the fast redox reactions. As result, the NiS-PbS composite exhibits a higher specific capacity of 125.89 mA h g−1 at a current density of 2 A g−1 in 3 M KOH electrolyte solution, and it is 1.62 and 2.67 times higher than the bare NiS and PbS electrodes. In addition, NiS-PbS composite delivers excellent cycling stability retaining 88.97% of initial capacitance after 3000 cycles, which is much larger than that of NiS (76.86%) and PbS (82.72%) electrodes. Our results demonstrate that the microflower structured NiS-PbS composites are promising for supercapacitor applications.

Original languageEnglish
Article number100925
JournalJournal of Energy Storage
Volume26
DOIs
Publication statusPublished - Dec 2019

Keywords

  • Battery-type behavior
  • Composite
  • Microflower
  • NiS-PbS
  • Supercapacitor

ASJC Scopus subject areas

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

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