3D yolk-shell NiGa2S4 microspheres confined with nanosheets for high performance supercapacitors

Shude Liu, Kwang Ho Kim, Je Moon Yun, Aniruddha Kundu, K. Vijaya Sankar, Umakant M. Patil, Chaiti Ray, Seong Chan Jun

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Recent advances in the development of two-dimensional transition-metal chalcogenides (2D TMCs) have opened up new avenues for supercapacitor applications. However, they still suffer from limited specific capacitance and poor rate capability due to their poor interfacial properties and simple geometry. Here, we propose a facile strategy for the synthesis of yolk-shell NiGa2S4 microspheres comprising crumpled nanosheets supported on nickel foam. The robust structure not only highly facilitates the electron and charge transportation but also efficiently alleviates the volume expansion during redox reactions, contributing to excellent electrochemical behaviors in terms of specific capacitance and rate capability. Significantly, an asymmetric supercapacitor based on the prepared NiGa2S4 as the positive electrode and N,S-codoped graphene/Fe2O3 (N,S-G/Fe2O3) as the negative electrode delivers a high energy density of 43.6 W h kg-1 at a power density of 961 W kg-1 and retains an energy density of 22.2 W h kg-1 even at 15 974 W kg-1. These impressive results may provide a new perspective to develop high energy and power density storage systems for practical applications.

Original languageEnglish
Pages (from-to)6292-6298
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number13
DOIs
Publication statusPublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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