Pseudocapacitive performance of manganese oxide coated hierarchical cobalt oxide structure prepared by hydrothermal process

C. K. Lin, P. C. Lin, S. J. Shih, C. J. Chang, J. B. Shi, C. Y. Chen

Research output: Contribution to journalArticle

Abstract

In the present study, a manganese (Mn) oxide deposited hierarchical cobalt (Co) oxide structure was prepared as a supercapacitor electrode by a two-step hydrothermal process. A Co-oxide hierarchical structure was first prepared as a template on a graphite substrate by hydrothermal and post heat treatment (calcination) processes. Subsequently, the Mn-oxide was deposited onto the surface of the Co-oxide template to form a Mn-oxide coated hierarchical Co-oxide structure by a secondary hydrothermal process. The effects of calcination time on the material characteristics and pseudocapacitive performance of the Mn-oxide coated structure were investigated. Experimental results showed that the microstructural properties of hydrothermally synthesized Co-oxide with a snowflake-like morphology varied with the calcination conditions. A great improvement of > 100% in capacitance of the Mn-oxide coating was obtained by using a template with a Co-oxide hierarchical structure. Moreover, with high capacitance, the excellent cycling stability of the Mn-oxide coated hierarchical Co-oxide structure exhibited high potential for practical application as a pseudocapacitor.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 2017

Keywords

  • A. Powders: chemical preparation
  • C. Electrical properties
  • E. Capacitors
  • E. Electrodes
  • Hydrothermal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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