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Citation: XU Guorong, LI Yubing, DONG Wenhao, TANG Anping. Preparation of Mn₃O₄ Nanoparticles in Alkaline Solution and Their Application in Supercapacitor[J]. Chinese Journal of Applied Chemistry, ;2015, 32(6): 701-707. doi: 10.11944/j.issn.1000-0518.2015.06.140360 shu

Preparation of Mn₃O₄ Nanoparticles in Alkaline Solution and Their Application in Supercapacitor

1.
School of Chemistry and Chemical Engineering, Hu'nan University of Science and Technology, Xiangtan, Hu'nan 411201, China

Corresponding author: XU Guorong,
Received Date: 22 October 2014
Available Online: 13 February 2015
Fund Project: 湖南省科技厅资助项目(2012GK3098) (2012GK3098)

Mn₃O₄nanoparticles were prepared in alkaline solution and their electrochemical characteristics were investigated. The obtained Mn₃O₄ nanoparticles were characterized by scanning electron microscopy(SEM), X-ray diffraction analysis(XRD), cyclicvoltammetry(CV), galvanostatic charge/discharge(GC/D),and electrochemical impedance spectroscopy(EIS). The Mn₃O₄ nanoparticles can be prepared directly in NaOH and NH₃ solution. MnCO₃ is only obtained in Na₂CO₃ solution,and can be transformed to Mn₃O₄ nanoparticles in the presence of NaOH. The crystalline sizes of the Mn₃O₄ nanoparticles prepared in NaOH,NH₃ and Na₂CO₃solution are 29.5 nm, 20.2 nm and 36.3 nm, respectively. The Mn₃O₄ nanoparticles could be conditioned and inverted to birnessite-type MnO₂. A specific capacitance of 239 F/g is obtained for the conditioned Mn₃O₄ nanoparticles prepared in NH₃ solution at a current rate of 0.25 A/g.Therefore,the Mn₃O₄ nanoparticles obtained in NH₃ solution can be a promising electrode materials for supercapacitors.
- supercapacitor,
- manganous manganic oxide,
- chemical precipitation,
- electrochemical properties
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Preparation of Mn₃O₄ Nanoparticles in Alkaline Solution and Their Application in Supercapacitor