Remarkable capacity retention of nanostructured manganese oxide upon cycling as an electrode material for supercapacitor

P. Ragupathy, Dae Hoon Park, Guy Campet, H. N. Vasan, Seong Ju Hwang, Jin Ho Choy, N. Munichandraiah

Research output: Contribution to journalArticle

212 Citations (Scopus)

Abstract

Electrochemical capacity retention of nearly X-ray amorphous nanostructured manganese oxide (nanoMnO2) synthesized by mixing directly KMnO 4 with ethylene glycol under ambient conditions for supercapacitor studies is enhanced significantly. Although X-ray diffraction (XRD) pattern of nanoMnO2 shows poor crystallinity, it is found that by Mn K-edge X-ray absorption near edge structure (XANES) measurement that the nanoMnO 2 obtained is locally arranged in a δ-MnO2-type layered structure composed of edge-shared network of MnO6 octahedra. Field emission scanning electron microscopy and XANES measurements show that nanoMnO2 contains nearly spherical shaped morphology with δ-MnO2 structure, and 1D nanorods of α-MnO 2type structure (powder XRD) in the annealed (600 d̀C) sample. Volumetric nitrogen adsorption - desorption isotherms, inductively coupled plasma analysis, and thermal analysis are carried out to obtain physicochemical properties such as surface area (230 m2 g-l), porosity of nanoMnO2 (secondary mesopores of diameter 14.5 nm), water content, composition, etc., which lead to the promising electrochemical properties as an electrode for supercapacitor. The nanoMnO2 shows a very high stability even after 1200 cycles with capacity retention of about 250 F g -1.

Original languageEnglish
Pages (from-to)6303-6309
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number15
DOIs
Publication statusPublished - 2009 Apr 16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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