期刊
SYNTHETIC METALS
卷 175, 期 -, 页码 138-145出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2013.05.013
关键词
Unipolar pulse electro-polymerization; Polypyrrole film; Supercapacitor; High cycle stability
资金
- National Natural Science Foundation of China [21276173]
- Natural Science Foundation of Shanxi Province [2012011020-5, 2012011006-1]
- International Joint Research Project of Shanxi Province [2011081028]
- JSPS KAKENHI Grant [24651066]
- Grants-in-Aid for Scientific Research [24651066] Funding Source: KAKEN
Polypyrrole (PPy) film was fabricated on platinum substrate by a facile unipolar pulse electro-polymerization (UPEP) method. Mechanism for the formation of highly stable PPy film was proposed based on the chronoamperogram obtained during the polymerization process. Structure, surface morphology and hydrophilic property of the PPy film prepared using either UPEP method or potentiostatic method (PM) were characterized by Fourier transfer infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and contact angle goniometer, respectively. Electrochemical performances of PPy films prepared by UPEP and PM were compared using cyclic voltammetry (CV), galvanostatic charge/discharge tests and electrochemical impedance spectroscopy (EIS) in 1.0 M of KCl solution. It is found that the PPy film prepared by UPEP method under the conditions of ultra short on-time pulse (10 ms) and low temperature (10.0 degrees C) showed an ordered structure with reduced chain defects and exhibited high specific capacitance and excellent cycling stability in neutral solution. The capacitance of such a PPy film electrode retained 93.6% of its initial value even after 50,000 charge/discharge cycles. The specific capacitance of the UPEP PPy film reached 406.0 F g(-1) at a scan rate of 5 mV s(-1) when temperature, pulse potential, pulse time ratio (t(on)/t(off)) and pulse cycles were 10.0 degrees C, 0.7V, 10 ms/100 ms and 12,000, respectively. (c) 2013 Elsevier B.V. All rights reserved.
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