Morphology-dependent enhancement of the pseudocapacitance of template-guided tunable polyaniline nanostructures

Wei Chen, Rakhi Raghavan Baby, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

Polyaniline is one of the most investigated conducting polymers as supercapacitor material for energy storage applications. The preparation of nanostructured polyaniline with well-controlled morphology is crucial to obtaining good supercapacitor performance. We present here a facile chemical process to produce polyaniline nanostructures with three different morphologies (i.e., nanofibers, nanospheres, and nanotubes) by utilizing the corresponding tunable morphology of MnO2 reactive templates. A growth mechanism is proposed to explain the evolution of polyaniline morphology based on the reactive templates. The morphology-induced improvement in the electrochemical performance of polyaniline pseudocapacitors is as large as 51% due to the much enhanced surface area and the porous nature of the template-guided polyaniline nanostructures. In addition, and for the first time, a redox-active electrolyte is applied to the polyaniline pseudocapacitors to achieve significant enhancement of pseudocapacitance. Compared to the conventional electrolyte, the enhancement of pseudocapacitance in the redox-active electrolyte is 49%-78%, depending on the specific polyaniline morphology, reaching the highest reported capacitance of 896 F/g for polyaniline full cells so far. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)15009-15019
Number of pages11
JournalThe Journal of Physical Chemistry C
Volume117
Issue number29
DOIs
StatePublished - Jul 12 2013

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank Olga Zausalina for the graphical illustration design. W.C. acknowledges support from the KAUST Graduate Fellowship. R.B.R. acknowledges support from SABIC Postdoctoral Fellowship. HA acknowledges the support from the KAUST baseline fund.

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • General Energy
  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials

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