Journal of Inorganic Materials ›› 2010, Vol. 25 ›› Issue (12): 1268-1272.DOI: 10.3724/SP.J.1077.2010.01268

• Research Paper • Previous Articles     Next Articles

Preparation and Electrochemical Capacitance of α-Ni(OH)2 Synthesized by Microwave-assisted Hydrothermal Method

XIAN Qing-Long 1, LI Juan 1, 2   

  1. (1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China; 2. School of Science, Xi’an Jiaotong University, Xi’an 710049, China)
  • Received:2010-03-26 Revised:2010-05-19 Published:2010-12-20 Online:2010-11-24
  • Supported by:

    National Nature Science Foundation of China(20663006)

Abstract: Ni(OH)2 particles were successfully prepared with Ni(NO3)2·6H2O as the raw material and CO(NH2)2 as the precipitation agent by microwave-assisted hydrothermal method. The obtained Ni(OH)2 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical measurements. XRD results showed that the as-prepared Ni(OH)2 particles had the typical α-phase. The SEM images revealed that the synthesized α-Ni(OH)2 particles were well dispersed and ball-flower like with diameters of 0.5-3 μm which consisted of the aggregated flakes. Electrochemical properties were studied by cyclic voltammograms (CV) and galvanostatic charge-discharge tests in 6 mol/L KOH electrolyte. All the tests showed that the reactants ratio affected the morphologies and the electrochemical capacitance of the materials. When the molar ratio of the CO(NH2)2 to Ni(NO3)2·6H2O was 3:1, the obtained α-Ni(OH)2 had the maximal initial special capacity; when the molar ratio was 2:1, the α-Ni(OH)2 had the best cycle storage performance.

Key words: microwave-assisted hydrothermal method, α-Ni(OH)2, supercapacitor

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