TY - JOUR
T1 - Effect of heat treatment on material characteristics and pseudo-capacitive properties of manganese oxide prepared by anodic deposition
AU - Chang, Jeng Kuei
AU - Chen, Yi Lun
AU - Tsai, Wen Ta
N1 - Funding Information:
The authors are grateful to the National Science Council of the Republic of China for financially supporting this research under Contract No. NSC 92-2216-E-006-043.
PY - 2004/9/3
Y1 - 2004/9/3
N2 - Hydrous manganese oxide with amorphous structure is prepared by anodic deposition in manganese acetate solution. The effect of heat treatment (100-700°C) on the material characteristics of the oxides is investigated. The thermal property of the deposited oxide is examined by thermogravimetric and differential thermal analyses. Dehydration, organic-matter decomposition, oxidation and crystallization of the manganese oxide as a function of temperature are examined. Glancing angle X-ray diffraction, scanning electron microscope and X-ray photoelectron spectroscopy are carried out to explore, respectively, the crystal structure, surface morphology and chemical state of the oxide electrodes. It is found that the as-deposited manganese oxide, with an amorphous structure and fibrous feature, is further oxidized and tends to tangle with increasing annealing temperature (below 500°C). When the temperature uses above 500°C, the formation of crystalline oxide is confirmed. Cyclic voltammetry is also performed to evaluate the electrochemical performance of the oxide electrodes annealed at various temperatures. Excellent pseudo-capacitive behaviour of the oxide electrodes is revealed at a low annealing temperature (≤200°C). The cyclic stability of the deposited manganese oxide is significantly improved by introducing proper heat treatment.
AB - Hydrous manganese oxide with amorphous structure is prepared by anodic deposition in manganese acetate solution. The effect of heat treatment (100-700°C) on the material characteristics of the oxides is investigated. The thermal property of the deposited oxide is examined by thermogravimetric and differential thermal analyses. Dehydration, organic-matter decomposition, oxidation and crystallization of the manganese oxide as a function of temperature are examined. Glancing angle X-ray diffraction, scanning electron microscope and X-ray photoelectron spectroscopy are carried out to explore, respectively, the crystal structure, surface morphology and chemical state of the oxide electrodes. It is found that the as-deposited manganese oxide, with an amorphous structure and fibrous feature, is further oxidized and tends to tangle with increasing annealing temperature (below 500°C). When the temperature uses above 500°C, the formation of crystalline oxide is confirmed. Cyclic voltammetry is also performed to evaluate the electrochemical performance of the oxide electrodes annealed at various temperatures. Excellent pseudo-capacitive behaviour of the oxide electrodes is revealed at a low annealing temperature (≤200°C). The cyclic stability of the deposited manganese oxide is significantly improved by introducing proper heat treatment.
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U2 - 10.1016/j.jpowsour.2004.03.076
DO - 10.1016/j.jpowsour.2004.03.076
M3 - Article
AN - SCOPUS:4243121654
SN - 0378-7753
VL - 135
SP - 344
EP - 353
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 1-2
ER -