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

7 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

Fingerprint

Manganese oxide
manganese oxides
Sol-gels
gels
coatings
Coatings
Oxide films
oxide films
Cyclic voltammetry
spinel
Powders
Capacitance
capacitance
nanostructure (characteristics)
cycles
sol-gel processes
Crystallite size
Sol-gel process
manganese oxide
heat treatment

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

Cite this

High supercapacitive performance of sol-gel ZnO-doped manganese oxide coatings. / Chen, Chin Yi; Chiang, Chi Ying; Shih, Shao Ju; Tsay, Chien Yie; Lin, Chung Kwei.

In: Thin Solid Films, Vol. 528, 15.01.2013, p. 61-66.

Research output: Contribution to journalArticle

Chen, Chin Yi ; Chiang, Chi Ying ; Shih, Shao Ju ; Tsay, Chien Yie ; Lin, Chung Kwei. / High supercapacitive performance of sol-gel ZnO-doped manganese oxide coatings. In: Thin Solid Films. 2013 ; Vol. 528. pp. 61-66.
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