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Citation: LI Jia-Yu, QI Li, WANG Hong-Yu. Analysis of Electrochemical Performances of Different Mesoporous Manganese Dioxide Materials by Quartz Crystal Microbalance[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(4): 560-564. doi: 10.11895/j.issn.0253-3820.160599 shu

Analysis of Electrochemical Performances of Different Mesoporous Manganese Dioxide Materials by Quartz Crystal Microbalance

LI Jia-Yu ^1,2, ,
QI Li ¹ ,
WANG Hong-Yu ¹

1.
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2.
University of Science and Technology of China, Hefei 230026, China

Received Date: 11 August 2016
Revised Date: 12 December 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21571173) and the National Basic Research Program of China (No. 2012CB932800)

The mesoporous manganese dioxide (MnO₂) materials were synthesized by the calcinations of manganese carbonate (MnCO₃) precursors in air atmosphere at 300, 350 and 400℃. The slurries of MnO₂ and binder were sprayed on the quartz electrodes. Quartz crystal microbalance (QCM) was conducted with cyclic voltammetry to analyze the electrochemical behaviors of the three MnO₂ samples in 0.1 mol/L sodium sulfate (Na₂SO₄). The mass of the three samples were generally increased during potential cycling, especially in the first stage, which suggested that an irreversible reaction process occurred. The as-synthesized MnO₂ at 300℃ had the better electrochemical stability and capacity retentivity. The three materials were assembled to (-) active carbon/MnO₂ (+) supercapacitors and the charge-discharge tests were conducted. The results showed that 35%-40% capacity loss was occurred in the initial cycling, and the total discharge capacities of MnO₂ formed at 300℃, 350℃, 400℃ were 15.9, 12.9, 11.7 mA h/g, respectively. The detection results of QCM method were consistent with that of the charge-discharge tests, suggesting that this QCM method could be used for distinguishing the electrochemical performance of mesoporous MnO₂ materials.
- Quartz crystal microbalance,
- Manganese dioxide,
- Mesoporous materials,
- Supercapacitor
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