Physicochemical factors that affect the pseudocapacitance and cyclic stability of Mn oxide electrodes

Jeng-Kuei Chang*, Chiung Hui Huang, Ming Tsung Lee, Wen Ta Tsai, Ming Jay Deng, I. Wen Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


Manganese (Mn) oxide was prepared by anodizing metallic Mn film that was electrodeposited in n-butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide (BMP-NTf2) ionic liquid. Different anodization courses, namely potentiostatic and cyclic voltammetric methods, led to variations in physical and chemical characteristics of the Mn oxides, and therefore in their pseudocapacitive performance. Evolution of the microstructure, residual weight, and chemical state of the Mn oxides with the charge-discharge cycling number was studied using a scanning electron microscope (SEM), an atomic absorption spectroscope, and an X-ray photoelectron spectroscope, respectively. The analytical results indicate that the electrochemical stability of Mn oxide is mainly determined by its microstructure; the more fibrous (or porous) oxide had a greater durability against cyclic charge-discharge. Moreover, the chemically hydrous state was found to be the most crucial factor that governed the mass specific capacitance of Mn oxide.

Original languageEnglish
Pages (from-to)3278-3284
Number of pages7
JournalElectrochimica Acta
Issue number12
StatePublished - 30 Apr 2009


  • Cyclic stability
  • Ionic liquid
  • Mn oxide
  • Pseudocapacitance
  • Supercapacitor


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