Microwave-assisted non-aqueous homogenous precipitation of nanoball-like mesoporous α-Ni(OH) 2 as a precursor for NiO x and its application as a pseudocapacitor

Xianqing Tian, Changming Cheng, Lei Qian, Baozhan Zheng, Hongyan Yuan, Shunping Xie, Dan Xiao*, Martin M F CHOI

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)

Abstract

A novel facile and template-free method to prepare a nanoball-like NiO x material has been developed. The preparation involves the synthesis of an α-Ni(OH) 2 precursor by microwave heating and calcination of the precursor. The NiO x material possesses a nanoball-like structure with a large surface area. The pseudo-capacitive properties of the NiO x material were evaluated by cyclic voltammetry and electro-chemical impedance spectroscopy in 6 M KOH solution. The specific capacitances were 951, 796, 713 and 650 F g -1, corresponding to the scan rates of 2.0, 5.0, 10 and 20 mV s -1, respectively. The NiO x material also showed excellent cycling stability and maintained 92% of its maximum specific capacitance after 1000 cycles. The hybrid supercapacitor based on this NiO x material exhibited moderate energy density and power density.

Original languageEnglish
Pages (from-to)8029-8035
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number16
DOIs
Publication statusPublished - 28 Apr 2012

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

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