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 language | English |
|---|---|
| Pages (from-to) | 61-66 |
| Number of pages | 6 |
| Journal | Thin Solid Films |
| Volume | 528 |
| DOIs | |
| Publication status | Published - Jan 15 2013 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - High supercapacitive performance of sol-gel ZnO-doped manganese oxide coatings
AU - Chen, Chin Yi
AU - Chiang, Chi Ying
AU - Shih, Shao Ju
AU - Tsay, Chien Yie
AU - Lin, Chung Kwei
PY - 2013/1/15
Y1 - 2013/1/15
N2 - 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.
AB - 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.
KW - Cyclic voltammetry
KW - Manganese oxide
KW - Sol-gel
KW - Supercapacitor
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=84872945869&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84872945869&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2012.09.092
DO - 10.1016/j.tsf.2012.09.092
M3 - Article
AN - SCOPUS:84872945869
VL - 528
SP - 61
EP - 66
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
ER -