High supercapacitive performance of sol-gel ZnO-doped manganese oxide coatings

Chin Yi Chen, Chi Ying Chiang, Shao Ju Shih, Chien Yie Tsay, Chung Kwei Lin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In the present study, ZnO-doped manganese (Mn) oxide coatings were prepared as a function of ZnO content (≤ 40 at.%) by sol-gel process. After post heat treatment at 300 °C, the influences of ZnO on the microstructural characteristics and pseudocapacitive performance of the Mn-oxide films were investigated. The structural analyses identified the sol-gel ZnO-doped Mn-oxide powder as a tetragonal Mn3O4 phase with a nanocrystalline structure. The formation of ZnxMn3 - xO4 spinel occurred when ZnO content was ≥ 20 at.%. The crystallite size of Mn-oxide powder increased when a small amount of ZnO was added, and then decreased when larger amounts were added. The cyclic voltammetry (CV) data showed that the specific capacitance (SC) of the Mn-oxide film in 1 M Na2SO 4 electrolyte can be increased from 236 F/g to 301 F/g at 25 mV/s by doping with 10 at.% ZnO. The formation of spinel tended to inhibit the SC value of the films. After activation of the Mn-oxide film, however, a relatively high cycling efficiency of > 85% was obtained for all compositions after 1200 CV cycles.

Original languageEnglish
Pages (from-to)61-66
Number of pages6
JournalThin Solid Films
Volume528
DOIs
Publication statusPublished - Jan 15 2013
Externally publishedYes

Keywords

  • Cyclic voltammetry
  • Manganese oxide
  • Sol-gel
  • Supercapacitor
  • Zinc oxide

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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