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Preparation and electrochemical properties of nanofiber poly(2,5-dihydroxyaniline)/activated carbon composite electrode for supercapacitor

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Abstract

In this study, poly(2,5-dihydroxyaniline) (PDHA) was successfully prepared by electrochemical method on the surface of active carbon (AC) electrodes. The physical and electrochemistry properties of PDHA/AC composite electrode compared with pure AC electrode were investigated by scanning electronic microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy, cycle life test. From SEM, PDHA presents nanofiber network morphology. The diameter of the nanofiber PDHA is about 200–300 nm. PDHA/AC composite electrode shows redox peaks in CV curve and voltage plateaus in galvanostatic charge–discharge curve, and all these indicate that PDHA/AC composite electrode has more advantages. The maintenance of the capacitance compared to initial cycle capacitance of composite electrode is about 90% during the charge–discharge cycles. In conclusion, The PDHA/AC composite electrode shows much higher specific capacitance (958 F g−1), better power characteristics, longer cycle life. Therefore, PDHA/AC composite electrodes were more promising for application in capacitor. This can be attributed to the introduction of nanofiber PDHA. The effect and role of PDHA in the composite electrodes were also discussed in detail.

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Abbreviations

PDHA:

Poly(2,5-dihydroxyaniline)

AC:

Active carbon

PDHA/AC:

Poly(2,5-dihydroxyaniline)/activated carbon

SEM:

Scanning electronic microscope

CV:

Cyclic voltammetry

EIS:

Electrochemical impedance spectroscopy

C:

Carbon

PVDF:

Polyvinylidene fluoride

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Acknowledgements

We would like to thank the National Natural Science Foundation of China (Grant No. 50642011) and the Natural Science Foundation of Shandong Province of China (Grant No. 2006GG2207006) for the financial support.

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Authors and Affiliations

  1. Institute of Material Science and Engineering, Ocean University of China, Qingdao, 266100, People’s Republic of China

    Lan Liu, Wei Wang, Wu-yuan Zou, Ben-lin He, Ming-liang Sun, Min Wang & Xue-fei Xu

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  1. Lan Liu
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  2. Wei Wang
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  3. Wu-yuan Zou
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  4. Ben-lin He
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  5. Ming-liang Sun
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  6. Min Wang
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Correspondence to Wei Wang.

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Liu, L., Wang, W., Zou, Wy. et al. Preparation and electrochemical properties of nanofiber poly(2,5-dihydroxyaniline)/activated carbon composite electrode for supercapacitor. J Solid State Electrochem 14, 2219–2224 (2010). https://doi.org/10.1007/s10008-010-1051-7

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  • DOI: https://doi.org/10.1007/s10008-010-1051-7

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