Co9S8-Ni3S2/CuMn2O4-NiMn2O4 and MnFe2O4-ZnFe2O4/graphene as binder-free cathode and anode materials for high energy density supercapacitors

Chandu V.V.Muralee Gopi, Rajangam Vinodh, Sangaraju Sambasivam, Ihab M. Obaidat, Saurabh Singh, Hee Je Kim

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

An essential route to improve the energy density of asymmetric supercapacitor (ASC) is to develop unique, smart and highly-efficient positive and negative current collectors with hierarchical combination of various electroactive materials. Herein, we developed a multicomponent integration of hierarchical Co9S8-Ni3S2 nanoparticles anchored on CuMn2O4-NiMn2O4 nanosheet arrays (Co-Ni-S NPs/Cu-Ni-Mn-O NSAs) and rhombus-like shaped MnFe2O4-ZnFe2O4 nanocrystals are grown on the graphene-ink nanosheets (Mn-Zn-Fe-O/G-ink), which were effectively applied as a superior binder-free cathode and anode electrodes for ASCs. The hierarchical Co-Ni-S NPs/Cu-Ni-Mn-O NSAs and Mn-Zn-Fe-O/G-ink electrode architectures show large surface area, high conductivity and provide rich active sites for redox reactions. As a result, the electrochemical properties of Co-Ni-S NPs/Cu-Ni-Mn-O NSAs and Mn-Zn-Fe-O/G-ink electrodes deliver that both have excellent specific capacities (263 and 149.44 mA h g−1 at 2 A g−1), superior rate capabilities (86.54% and 92.64% even at 20 A g−1) and remarkable cycling stabilities (97.39% and 94.83% over 5000 cycles), respectively. Furthermore, an asymmetric supercapacitor (ASC) assembled using the Co-Ni-S NPs/Cu-Ni-Mn-O NSAs as positive electrode and Mn-Zn-Fe-O/G-ink as negative electrode with an aqueous KOH electrolyte. The energy and power densities of the ASC are calculated based on the weight of the electroactive materials. As a result, the ASC delivers ultrahigh energy and power densities of 75.65 W h kg−1 and 6629.53 W kg−1 as well as achieve exceptional cycling stability of 96.89% retention with 98.26% of columbic efficiency over 5000 cycles. These attractive results of binder-free advanced current collectors with composites of various active materials and favorable architectures paves a path for the engineering of new class collectors for high-performance ASCs.

Original languageEnglish
Article number122640
JournalChemical Engineering Journal
Volume381
DOIs
Publication statusPublished - Feb 1 2020

Keywords

  • CoS-NiS nanoparticles
  • CuMnO-NiMnO nanosheet arrays
  • Energy density
  • Graphene-ink
  • MnFeO-ZnFeO
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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