Study on the electrochemical kinetics of manganese dioxide/multiwall carbon nanotube composite by voltammetric charge analysis

Seung Beom Yoon, Hyun Kon Song, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Electrochemical properties of MnO2/multiwall carbon nanotube (MWCNT) composites were investigated by using cavity microelectrodes (CME). Electrochemical kinetics of the MnO2/MWCNT composites were studied by analyzing the scan rate dependence of voltammetric charge,which wasmeasured by cyclic voltammetry (CV) at various scan rates ranging from 20mVs-1 to 1000mVs-1. Based on several mathematical models, the relationship between voltammetric charge and scan rate was interpreted systematically. At slow scan rates, ion diffusion in MnO2 dominantly determined the rate of the overall electrochemical process. However, the faradaic reaction of Mn3+/Mn4+ at the MnO2 surface competed with mass transfer in terms of kinetics when the potential scan rate was higher than 400 mV s-1.

Original languageEnglish
Pages (from-to)A137-A141
JournalJournal of the Electrochemical Society
Volume161
Issue number1
DOIs
Publication statusPublished - 2014

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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