Analysis of Electrochemical Performances of Different Mesoporous Manganese Dioxide Materials by Quartz Crystal Microbalance
10.11895/j.issn.0253-3820.160599
- VernacularTitle:石英晶体微天平分析不同介孔二氧化锰材料的电化学性能
- Author:
Jiayu LI
;
Li QI
;
Hongyu WANG
- Keywords:
Quartz crystal microbalance;
Manganese dioxide;
Mesoporous materials;
Supercapacitor
- From:
Chinese Journal of Analytical Chemistry
2017;45(4):560-564
- CountryChina
- Language:Chinese
-
Abstract:
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.
