Research Progress in Nano-Structured MnO2 as Electrode Materials for Supercapacitors: A Review

Ting-Ting Liu1,3, Guang-Jie Shao1,2,*, Ming-Tong Ji3 and Zhi-Peng Ma1

1Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P.R. China

2State key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P.R. China

3Northeast Petroleum University at Qinhuangdao, Qinhuangdao 066004, P.R. China

*Corresponding author: Tel/Fax: +86 335 8061569; E-mail: shaogj145@163.com

Abstract

Manganese dioxide has been considered to be promising electrode materials for supercapacitors in terms of its abundant storage, low cost and superior electrochemica1 performance. Synthetic methods of preparing nano-structured MnO2 were summarized systematically and the recent developments were reviewed. The methods involved hydrothermal synthesis, sol-gel, chemical co-precipitation, low-temperature solid-state synthesis, electro-deposition, microemulsion, pyrolysis and microwave synthesis. Moreover, the solutions to improve the specific capacitance, electric conductivity and stabilization by doping or composite with carbon materials, metals and conductive polymers were also discussed. Finally, it indicates in the article that composite MnO2 electrode materials will become the main trend in future researches.

Keywords

MnO2, Supercapacitor, Electrode material, Doping, Composite.

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