Pseudocapacitive properties of carbon nanotube/manganese oxide electrode deposited by electrophoretic deposition

Chin Yi Chen, Tzu Chin Chien, Yu Chen Chan, Chung Kwei Lin, Sheng Chang Wang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Nanocrystalline manganese oxide powder prepared by spray pyrolysis (SP) was mixed with multi-walled carbon nanotubes (MWCNTs) in a suspension and subsequently co-coated onto graphite substrates via an electrophoretic deposition technique (EPD). The deposited coatings with or without CNTs mix were examined by X-ray diffractometry (XRD); the coatings were examined by cycling voltammetry (CV) and charge/discharge tests. Structural investigation by XRD revealed that the as-deposited Mn-oxide powder exhibited Mn3O4 phase with nanocrystalline structure. The CNTs/Mn-oxide coatings exhibited a porous structure with some hollow or fractured Mn-oxide particles inserted and possessed a high surface area for the electrochemical redox reactions. CV examination showed that the porous CNTs/Mn-oxide coatings exhibited the high specific capacitance of 260 F/g which was higher than the value (234 F/g) of Mn-oxide coatings without CNTs mix at a scan rate of 25 mV/s. After 500 cycles of CV tests, the specific capacitance decreased to 228 F/g, showing a comparatively good efficiency of 88%. The high CV cycling stability of CNTs/Mn-oxide mixture is due to the fact that the CNTs network existent in between the Mn-oxide particles inhibits the structural breakdown of Mn-oxide particles during the repetitive insertion-expulsion of cations from aqueous electrolyte.

Original languageEnglish
Pages (from-to)482-485
Number of pages4
JournalDiamond and Related Materials
Volume18
Issue number2-3
DOIs
Publication statusPublished - Feb 2009
Externally publishedYes

Keywords

  • Carbon nanotube
  • Cyclic voltammetry
  • Cycling stability
  • Electrophoretic deposition
  • Manganese oxide
  • Supercapacitor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Chemistry(all)

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