共 35 条
Physicochemical factors that affect the pseudocapacitance and cyclic stability of Mn oxide electrodes
被引:49
作者:
Chang, Jeng-Kuei
[1
]
Huang, Chiung-Hui
[1
]
Lee, Ming-Tsung
[1
]
Tsai, Wen-Ta
[1
]
Deng, Ming-Jay
[2
]
Sun, I-Wen
[2
]
机构:
[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Dept Chem, Tainan 70101, Taiwan
关键词:
Mn oxide;
Supercapacitor;
Pseudocapacitance;
Cyclic stability;
Ionic liquid;
MANGANESE OXIDE;
THIN-FILM;
ELECTROCHEMICAL CAPACITORS;
HYDROTHERMAL SYNTHESIS;
IONIC LIQUID;
BEHAVIOR;
PERFORMANCE;
D O I:
10.1016/j.electacta.2008.12.042
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
Manganese (Mn) oxide was prepared by anodizing metallic Mn film that was electrodeposited in n-butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide (BMP-NTf2) ionic liquid. Different anodization courses, namely potentiostatic and cyclic voltammetric methods, led to variations in physical and chemical characteristics of the Mn oxides, and therefore in their pseudocapacitive performance. Evolution of the microstructure, residual weight, and chemical state of the Mn oxides with the charge-discharge cycling number was studied using a scanning electron microscope (SEM), an atomic absorption spectroscope, and an X-ray photoelectron spectroscope, respectively. The analytical results indicate that the electrochemical stability of Mn oxide is mainly determined by its microstructure; the more fibrous (or porous) oxide had a greater durability against cyclic charge-discharge. Moreover, the chemically hydrous state was found to be the most crucial factor that governed the mass specific capacitance of Mn oxide. (C) 2008 Elsevier Ltd. All rights reserved.
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页码:3278 / 3284
页数:7
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