Morphology controlled high performance supercapacitor behaviour of the Ni-Co binary hydroxide system

Xiang Sun, Gongkai Wang, Hongtao Sun, Fengyuan Lu, Mingpeng Yu, Jie Lian

Research output: Contribution to journalArticle

117 Scopus citations

Abstract

The morphology evolution of the Ni-Co binary hydroxides was studied varying from nanosheets, to nanoplate-nanospheres, to nanorods and to a nanoparticle geometry by simply controlling the Co:Ni ratio in the initial reactant. High capacitances of 1030 F g-1 and 804 F g-1 can be achieved in the 1-D nanorod morphology at mass loading of 1 mg cm-2 and 2.8 mg cm-2 at a current density of 3 A g-1, respectively. To demonstrate its practical application, the binary hydroxide electrode was coupled with chemically-reduced graphene (CG) forming an asymmetric supercapacitor in order to improve the potential window and thus energy density. The asymmetric supercapacitor delivers a high energy density of 26.3 Wh kg -1 at the power density of 320 W kg-1. The approach of controlling morphology and crystallinity of the binary system for optimizing supercapacitive performance may be applied developing other promising multiply metal hydroxide/oxide systems for supercapacitor applications.

Original languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalJournal of Power Sources
Volume238
DOIs
StatePublished - Apr 22 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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