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

doi:10.1149/2.070401jes

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

16 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 language	English
Pages (from-to)	A137-A141
Journal	Journal of the Electrochemical Society
Volume	161
Issue number	1
DOIs	https://doi.org/10.1149/2.070401jes
Publication status	Published - 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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This output contributes to the following UN Sustainable Development Goals (SDGs)

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

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.",

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T1 - Study on the electrochemical kinetics of manganese dioxide/multiwall carbon nanotube composite by voltammetric charge analysis

AU - Yoon, Seung Beom

AU - Song, Hyun Kon

AU - Roh, Kwang Chul

AU - Kim, Kwang Bum

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

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

Abstract

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