A Mathematical Model of Oxide/Carbon Composite Electrode for Supercapacitors

Hansung Kim, Branko N. Popov

Research output: Contribution to journalArticle

58 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
Pages (from-to)A1153-A1160
JournalJournal of the Electrochemical Society
Volume150
Issue number9
DOIs
Publication statusPublished - 2003 Sep

All Science Journal Classification (ASJC) codes

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

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