Charge storage performance of doped carbons prepared from polyaniline for supercapacitors |
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| Authors: | Limin Li Enhui Liu Haijie Shen Yanjing Yang Zhengzheng Huang Xiaoxia Xiang and Yingying Tian |
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| Institution: | (1) Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Hunan, 411105, People’s Republic of China; |
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| Abstract: | Doped carbons have been prepared from polyaniline for supercapacitors. The morphology of samples has been characterized by
scanning electron microscope, the surface chemical composition of samples has been investigated by X-ray photoelectron spectroscopy,
and the surface area of samples has been calculated by Brunauer–Emmett–Teller measurement. Electrochemical properties have
been studied by cyclic voltammograms, galvanostatic charge/discharge, and electrochemical impedance spectroscopy measurements
in 6 mol L−1 potassium hydroxide. Their charge storage performance has been evaluated, and the effect of nitrogen atomic functionalities
on the pseudocapacitive property has been studied. The experimental results have proved two mechanisms of energy storage in
doped carbons: double-layer formation and pseudocapacitance. The overall specific capacitance of doped unactivated carbon
is mainly attributed to pseudocapacitance, that of doped activated carbon prepared by physical activation is attributed to
the synergic effect of pseudocapacitance and double-layer capacitance, but that of doped activated carbon prepared by chemical
activation is mainly attributed to double-layer capacitance. |
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