Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (1): 75-82.DOI: 10.11944/j.issn.1000-0518.2019.01.180034

• Full Papers • Previous Articles     Next Articles

Synthesis and Electrochemical Properties of NiO Nanomaterials with Different Morphologies

FU Wanchenab,LI Qianab,FENG Dongdongab,WANG Weiab*()   

  1. aDepartment of Chemical Engineering,College of Environment Science and Engineering
    bKey Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Ministry of Education,Chang'an University,Xi'an 710054,China
  • Received:2018-02-02 Accepted:2018-05-24 Published:2019-01-01 Online:2019-01-04
  • Contact: WANG Wei
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51678059), the Natural Science Fundation of Shaanxi Province(No.2016JM5065), the Fundamental Research Foundation for the Central Universities(No.300102298202)

Abstract:

NiO nanosheets have been synthesized via a facile solvothermal route using water-ethylene glycol as solvent and polyvinyl pyrrolidone(PVP) as surfactant. These NiO nanosheets were interweaved with each other to form hierarchical flower-shaped structures. Nanocubes and nanospheres were also obtained through changing the reaction temperature and solvent. The electrochemical tests were conducted using a three-electrode system in 6 mol/L KOH with the as-synthesized NiO as the working electrode. Electrochemical properties were characterized by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. NiO nanosheets exhibit the highest specific capacitance(402 F/g at current density of 0.5 A/g) and the best rate capability(80.1% capacitance retention from 0.5 A/g to 4 A/g). NiO nanosheets also show excellent cycle stability, only lost 9.7% after 1000 cycles.

Key words: solvothermal, NiO nanomaterials, supercapacitors, capacitive performance