Metal-organic framework derived carbon-coated spherical bimetallic nickel-cobalt sulfide nanoparticles for hybrid supercapacitors

Wei Cao, Yu Liu, Fang Xu, Qing Xia, Guoping Du, Zhaoyang Fan, Nan Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Metal organic frameworks (MOFs) are an ideal platform to construct electroactive materials for electrochemical energy storage due to their unique structure and excellent porosity. However, it is still a challenge to make full use of their structural advantages to rationally design multi-component electrode materials for high-performance supercapacitors. Herein, carbon-coated spherical sulfide nanoparticles are reported by simultaneous carbonization and sulfurization using bimetal/monometal-based MOFs as the precursors. The NiCo2S4@C and NiS@C composite nanoparticles have excellent electronic conductivity, large porosity and high electrochemical reaction activity. In particular, the bimetallic NiCo2S4@C-based electrode exhibits a high specific capacity of 948.9 C g−1 at 1 A g−1. Furthermore, a hybrid supercapacitor assembled with NiCo2S4@C as the positive electrode and activated carbon as the negative electrode achieves a high energy density of 43.8 Wh kg−1 with power density at 799.1 W kg−1, and a capacitance retention rate of 81.9% after being subjected to 5000 cycles of charge and discharge. The results suggests using MOFs as precursors is a feasible strategy to synthesize advanced sulfide-based multi-component materials for electrochemical energy storage.

Original languageEnglish (US)
Article number138433
JournalElectrochimica Acta
Volume385
DOIs
StatePublished - Jul 20 2021
Externally publishedYes

Keywords

  • Carbon-coated nanoparticles
  • Electrochemical performance
  • Hybrid supercapacitor
  • MOFs
  • Transition metal sulfide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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