Nano ZnO-activated carbon composite electrodes for supercapacitors

M. Selvakumar, D. Krishna Bhat, A. Manish Aggarwal, S. Prahladh Iyer, G. Sravani

Research output: Contribution to journalArticle

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Abstract

A symmetrical (p/p) supercapacitor has been fabricated by making use of nanostructured zinc oxide (ZnO)-activated carbon (AC) composite electrodes for the first time. The composites have been characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction analysis (XRD). Electrochemical properties of the prepared nanocomposite electrodes and the supercapacitor have been studied using cyclic voltammetry (CV) and AC impedance spectroscopy in 0.1 M Na2SO4 as electrolyte. The ZnO-AC nanocomposite electrode showed a specific capacitance of 160 F/g for 1:1 composition. The specific capacitance of the electrodes decreased with increase in zinc oxide content. Galvanostatic charge-discharge measurements have been done at various current densities, namely 2, 4, 6 and 7 mA/cm2. It has been found that the cells have excellent electrochemical reversibility and capacitive characteristics in 0.1 M Na2SO4 electrolyte. It has also been observed that the specific capacitance is constant up to 500 cycles at all current densities.

Original languageEnglish
Pages (from-to)2286-2289
Number of pages4
JournalPhysica B: Condensed Matter
Volume405
Issue number9
DOIs
Publication statusPublished - 01-05-2010

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Zinc Oxide
electrochemical capacitors
activated carbon
Zinc oxide
zinc oxides
Activated carbon
Electrodes
Capacitance
composite materials
electrodes
capacitance
Composite materials
Electrolytes
Nanocomposites
nanocomposites
Current density
electrolytes
current density
Electrochemical properties
Field emission

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Selvakumar, M., Krishna Bhat, D., Manish Aggarwal, A., Prahladh Iyer, S., & Sravani, G. (2010). Nano ZnO-activated carbon composite electrodes for supercapacitors. Physica B: Condensed Matter, 405(9), 2286-2289. https://doi.org/10.1016/j.physb.2010.02.028
Selvakumar, M. ; Krishna Bhat, D. ; Manish Aggarwal, A. ; Prahladh Iyer, S. ; Sravani, G. / Nano ZnO-activated carbon composite electrodes for supercapacitors. In: Physica B: Condensed Matter. 2010 ; Vol. 405, No. 9. pp. 2286-2289.
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Selvakumar, M, Krishna Bhat, D, Manish Aggarwal, A, Prahladh Iyer, S & Sravani, G 2010, 'Nano ZnO-activated carbon composite electrodes for supercapacitors', Physica B: Condensed Matter, vol. 405, no. 9, pp. 2286-2289. https://doi.org/10.1016/j.physb.2010.02.028

Nano ZnO-activated carbon composite electrodes for supercapacitors. / Selvakumar, M.; Krishna Bhat, D.; Manish Aggarwal, A.; Prahladh Iyer, S.; Sravani, G.

In: Physica B: Condensed Matter, Vol. 405, No. 9, 01.05.2010, p. 2286-2289.

Research output: Contribution to journalArticle

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