Synthesis of polypyrrole film by pulse galvanostatic method and its application as supercapacitor electrode materials |
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| Authors: | Jing Zhang Ling-Bin Kong Heng Li Yong-Chun Luo Long Kang |
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| Affiliation: | (1) State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050 Lanzhou, People’s Republic of China;(2) Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education, Lanzhou University of Technology, 730050 Lanzhou, People’s Republic of China; |
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| Abstract: | Polypyrrole (PPy) film-coated stainless steel electrodes were prepared from aqueous solution containing 0.5 M p-toluene sulphonic acid and 0.1 M pyrrole using pulse galvanostatic method (PGM) and galvanostatic method (GM). The morphology was characterized by scanning electron microscopy. The electrochemical properties of PPy films were investigated with cyclic voltammetry, charge–discharge tests, and ac impedance spectroscopy. The results showed that the PGM-PPy films exhibited higher specific capacitance, better high-rate discharge ability and lower resistance, and were more promising for applications in supercapacitor than GM-PPy films. The specific capacitance (SC) of PGM-PPy films was 403 F g−1 in 1 M H2SO4 electrolyte and 281 F g−1 in 1 M NaNO3 electrolyte. |
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