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Controlled growth of polypyrrole microtubes on disposable pencil graphite electrode and their supercapacitor behavior
Published in Elsevier Ltd
2019
Volume: 324
   
Abstract
In the present study, we have reported a simple, facile and robust method for the controlled growth of polypyrrole microtubes (PPy MTs) on pencil graphite electrodes (PGE) via potentiostatic deposition without using any templates or structure-directing agents. The crucial role of the supporting electrolytes in dictating the formation of microtubules is analyzed and their nucleation – growth mechanism has been studied using the well-known Scharifker - Hills and Palomer – Pardove models. These microtubules modified pencil graphite electrodes exhibit a satisfactory supercapacitor behavior which has been demonstrated using voltammetric, charge-discharge and impedance studies. It has been observed that, the tubular-like geometry of PPy is more preferable for supercapacitor behavior than other morphology of PPy in the present context. Moreover, the influences of temperature on the specific capacitance and cycle stability have also been investigated. The effect of supporting electrolytes on the supercapacitive behavior of PPy MTs modified PGE have also been analyzed and a significant enhancement in the specific capacitance value with improved rate capability is observed in acidic medium than that of neutral medium. The profound increase in the magnitude of the specific capacitance of the bare pencil graphite electrodes upon modification with PPy MTs has been ascribed to its enhanced surface roughness, fractal dimension and porosity. © 2019 Elsevier Ltd
About the journal
JournalData powered by TypesetElectrochimica Acta
PublisherData powered by TypesetElsevier Ltd
ISSN00134686
Open AccessNo
Concepts (19)
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    Capacitance
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    Electric discharges
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    Electrolytes
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    Fractal dimension
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    Graphite
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    Morphology
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    Polypyrroles
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    Supercapacitor
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    Surface roughness
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    Voltammetry
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    Micro-tubes
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    PENCIL GRAPHITE ELECTRODE
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    PENCIL GRAPHITES
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    POTENTIOSTATIC DEPOSITION
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    RAGONE PLOT
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    STRUCTURE DIRECTING AGENTS
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    SUPERCAPACITIVE BEHAVIOR
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    Supporting electrolyte
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    GRAPHITE ELECTRODES