Characterization of spray pyrolyzed manganese oxide powders deposited by electrophoretic deposition technique

Chin Yi Chen, Yang Ru Lyu, Cherng Yuh Su, Hong Ming Lin, Chung Kwei Lin

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Nanocrystalline manganese oxide powders were prepared by spray pyrolysis (SP) from manganese acetate solution at 400 °C. The as-obtained powders were subsequently coated onto graphite substrates via an electrophoretic deposition technique (EPD). The as-prepared powders were examined by transmission electron microscopy (TEM), X-ray diffractometry (XRD), synchrotron X-ray absorption spectroscopy (XAS); the coatings were further examined by cycling voltammetry (CV). Experimental results showed that manganese oxide powders prepared at 400 °C were hollow spherical particles with fractured shells and possessed high surface area. CV examination showed that the as-deposited coatings also exhibited the highest specific capacitance of 275 F/g. After hundreds of CV cycles, the specific capacitance decreased to 234 F/g, which was still comparable to values reported in the literature. Structural investigation by TEM and XRD revealed that the as-deposited coatings exhibited Mn3O4 phase with amorphous-like structure. While synchrotron XAS results showed that the manganese had a valence of + 2.67, it was transited into tetravalent manganese after cyclic voltammetry.

Original languageEnglish
Pages (from-to)1277-1281
Number of pages5
JournalSurface and Coatings Technology
Volume202
Issue number4-7
DOIs
Publication statusPublished - Dec 15 2007
Externally publishedYes

Keywords

  • Cyclic voltammetry
  • Electrophoretic deposition
  • Manganese oxide
  • Supercapacitor
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Fingerprint Dive into the research topics of 'Characterization of spray pyrolyzed manganese oxide powders deposited by electrophoretic deposition technique'. Together they form a unique fingerprint.

  • Cite this