Double-Layer MnCo2S4@Ni-Co-S Core/Shell Nanostructure on Nickel Foam for High-Performance Supercapacitor

Kun Yu, Wing Man Tang, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

A double-layer MnCo2S4@Ni-Co-S (MCS@NCS) core/shell nanocomposite is successfully deposited on nickel foam using a facile and simple method which includes a hydrothermal treatment and an electrochemical deposition and exhibits excellent electrochemical performance. With the introduction of sulfur via a sulfurization process, the MnCo2S4 nanorods have larger specific surface area compared to the MnCo2O4 nanorods and can serve as porous scaffolds for loading a large amount of additional active materials, facilitating electron transport and ion diffusion. The deposited Ni-Co-S nanosheet on MnCo2S4 can further increase the electro-active surface area and electrical conductivity as well as reinforce the mechanical stability of the whole electrode. Combining both structural and electrochemical advantages, the electrode with MCS@NCS heterostructures has high areal capacitance (10.14 F cm−2 at 1 mA cm−2). An asymmetric supercapacitor with Ni foam-activated carbon as the negative electrode and Ni foam-MCS@NCS as the positive electrode is fabricated and shows remarkable high areal capacitance (1.92 F cm−2 at 1 mA cm−2) and good cycling stability (72% capacitance retention after 5000 cycles), demonstrating its great potential as an efficient energy storage device for electronic systems.

Original languageEnglish
Article number1800147
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume215
Issue number18
DOIs
Publication statusPublished - 19 Sep 2018

Keywords

  • asymmetric supercapacitors
  • core-shell nanocomposite
  • energy storage
  • transition metal sulfides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this