A Mathematical Model of Oxide/Carbon Composite Electrode for Supercapacitors

Hansung Kim, Branko N. Popov

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

A pseudo two-dimensional model is developed for the general application of supercapacitors consisting of an oxide/carbon composite electrode. The model takes into account the diffusion of protons in the oxide particle by employing the method of superposition. RuO2/carbon system is modeled as a specific example. From the simulation data, it is found that the oxide particle size and proton diffusion coefficient have an enormous effect on the performance at high discharge rate due to the limitation of proton transport into RuO2 particles. With increasing carbon ratio, the porosity of electrode increases, which causes the potential drop in solution phase to decrease. However, excess of carbon lowers the total capacitance because the pseudocapacitance from RuO2 decreases. Finally, the present model successfully provides a methodology to optimize cell configurations and operating conditions.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume150
Issue number9
DOIs
Publication statusPublished - 2003 Sep 1

Fingerprint

electrochemical capacitors
Oxides
mathematical models
Carbon
Mathematical models
Protons
Electrodes
composite materials
electrodes
oxides
carbon
Composite materials
protons
data simulation
two dimensional models
Capacitance
diffusion coefficient
Porosity
capacitance
Particle size

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

Cite this

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A Mathematical Model of Oxide/Carbon Composite Electrode for Supercapacitors. / Kim, Hansung; Popov, Branko N.

In: Journal of the Electrochemical Society, Vol. 150, No. 9, 01.09.2003.

Research output: Contribution to journalArticle

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