Microwave-assisted synthesis of hybrid CoxNi1-x(OH) 2 nanosheets: Tuning the composition for high performance supercapacitor

Gen Chen, Steven S. Liaw, Binsong Li, Yun Xu, Marco Dunwell, Shuguang Deng, Hongyou Fan, Hongmei Luo

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

Hybrid CoxNi1-x(OH)2 nanosheets have been successfully synthesized via a facile microwave-assisted synthetic route. The size of CoxNi1-x(OH)2 nanosheets decreases with the increase of nickel amount; however, the layered crystal structure can be maintained at any ratios of Co:Ni due to the chemical and physical similarities between these two elements. The lattice spacing of the hexagonal nanosheets can be slightly varied by adjusting the ratios of Co:Ni. The hybrid Co 0.2Ni0.8(OH)2 hexagonal nanosheets deliver a high capacity of above 1170 F g-1 at a current density of 4 A g -1. The higher specific capacitance of Co0.2Ni 0.8(OH)2 nanosheets than their monometallic counterpart could be attributed to the enhancement of the electro-active sites participated in the redox reaction due to the possible valence interchange or charge hopping between Co and Ni cations. These results indicate the importance of layered hydroxide nanosheets with tuned transition-metal composition for high-performance energy storage devices.

Original languageEnglish (US)
Pages (from-to)338-343
Number of pages6
JournalJournal of Power Sources
Volume251
DOIs
StatePublished - Apr 1 2014
Externally publishedYes

Keywords

  • Electrochemical
  • Hybrid hydroxides
  • Microwave-assisted
  • Nanosheet
  • Supercapacitors

ASJC Scopus subject areas

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

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