An asymmetric supercapacitor with excellent cycling performance realized by hierarchical porous NiGa2O4 nanosheets

Shude Liu, Kwan San Hui, Kwun Nam Hui, Hai Feng Li, Kar Wei Ng, Jincheng Xu, Zikang Tang, Seong Chan Jun

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Rational design of the composition and electrochemically favorable structural configuration of electrode materials are highly required to develop high-performance supercapacitors. Here, we report our findings on the design of interconnected NiGa2O4 nanosheets as advanced cathode electrodes for supercapacitors. Rietveld refinement analysis demonstrates that the incorporation of Ga into NiO leads to a larger cubic lattice parameter that promotes faster charge-transfer kinetics, enabling significantly improved electrochemical performance. The NiGa2O4 electrode delivers a specific capacitance of 1508 F g-1 at a current density of 1 A g-1 with a capacitance retention of 63.7% at 20 A g-1, together with excellent cycling stability after 10000 charge-discharge cycles (capacitance retention of 102.4%). An asymmetric supercapacitor device was assembled by using NiGa2O4 and Fe2O3 as cathode and anode electrodes, respectively. The ASC delivers a high energy density of 45.2 W h kg-1 at a power density of 1600 W kg-1 with exceptional cycling stability (94.3% cell capacitance retention after 10000 cycles). These results suggest that NiGa2O4 can serve as a new class cathode material for advanced electrochemical energy storage applications.

Original languageEnglish
Pages (from-to)19046-19053
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number36
DOIs
Publication statusPublished - 2017 Jan 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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