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

研究成果: 雜誌貢獻文章同行評審

33 引文 斯高帕斯(Scopus)

摘要

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.
原文英語
頁(從 - 到)1277-1281
頁數5
期刊Surface and Coatings Technology
202
發行號4-7
DOIs
出版狀態已發佈 - 十二月 15 2007
對外發佈

ASJC Scopus subject areas

  • 化學 (全部)
  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學

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