Synthesis and Characterization of Nickel-doped Manganese Dioxide Electrode Materials for Supercapacitors

Autor: Dong Jie, Hou Zhenzhong, Zhao Qiuli, Yang Qinghao
Jazyk: English<br />French
Rok vydání: 2019
Předmět:
Zdroj: E3S Web of Conferences, Vol 79, p 03002 (2019)
Druh dokumentu: article
ISSN: 2267-1242
DOI: 10.1051/e3sconf/20197903002
Popis: Nickel-doped manganese dioxide (Ni-MnO2) synthesized by sol-gel method has been used as an electrode material for supercapacitors. The structure and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). Results showed that the nickel-doped manganese dioxide sample exhibited irregular particles with the diameter of about 500 nm. The crystallographic structure of MnO2 was the poorly crystallized γ-MnO2. The doping ratio had a great influence on the electrochemical properties of the materials. When the molar ratio of Ni/Mn was 3/100, the specific capacitance of Ni-MnO2 achieved to 252.61 F/g. After 2000 charge/discharge cycles, the specific capacitance of Ni-MnO2 was still maintained at 74.36%, which was attributed to its excellent cycling stability.
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