Supercapacitive properties of spray pyrolyzed iron-added manganese oxide powders deposited by electrophoretic deposition technique

Sheng Chang Wang, Chin Yi Chen, Tzu Chin Chien, Pee Yew Lee, Chung Kwei Lin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Nanocrystalline iron-added manganese oxide powders were prepared by spray pyrolysis (SP) from manganese acetate and iron nitrate solutions at 400 °C. The as-obtained powders were subsequently deposited onto graphite substrates via an electrophoretic deposition technique (EPD). The as-prepared powders were examined by transmission electron microscopy (TEM) and X-ray diffractometry (XRD); the electrochemical properties of the coatings were further examined by cycling voltammetry (CV). Structural investigation by TEM and XRD revealed that the as-deposited coatings exhibited Mn3O4 phase with nanocrystalline structure. CV examinations showed that the iron addition significantly improved the electrochemical properties of the Mn-oxide powder coatings. The specific capacitance of as-deposited Mn-oxide coating was increased from 202 F/g to 232 F/g when 2 at.% of iron was added. Even after 1200 cycles of life test, the iron-added coatings exhibited higher cycling efficiency (~ 78% of the initial maximum capacitance) than that unadded one (~ 60% of its maximum value).

Original languageEnglish
Pages (from-to)1234-1238
Number of pages5
JournalThin Solid Films
Volume517
Issue number3
DOIs
Publication statusPublished - Dec 1 2008
Externally publishedYes

Keywords

  • Cyclic voltammetry
  • Cycling efficiency
  • Electrophoretic deposition
  • Iron
  • Manganese oxide
  • Spray pyrolysis
  • Supercapacitor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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