Electrochemical kinetics investigation of Li4Ti5O12/reduced graphene oxide nanocomposite using voltammetric charge analysis

Seung Beom Yoon, Hyun Kyung Kim, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The electrochemical kinetic properties of a Li4Ti5O12 (LTO)/reduced graphene oxide (RGO) nanocomposite were systematically investigated using cyclic voltammetry (CV). Since there are several factors that influence the electrochemical kinetics of LTO depending on the potential scan rate, the kinetic properties of LTO in the nanocomposite were evaluated by analyzing the scan rate dependence of the voltammetric charge, as measured by CV. When we formed a nanocomposite of LTO and electrically conductive RGO, the number of surface electrochemical reaction sites increased and that of the bulk electrochemical reaction sites decreased. This led to an improvement in the kinetics related to Li+ ion diffusion in LTO. The range of scan rates for which the voltammetric charge was decreased by the kinetic limitations ascribed to diffusion was reduced because of the decrease in the effective diffusion length and the increase in the diffusion area, compared to commercial LTO particles. Thus, unlike previous studies, we report that the improved rate capability of the composite with RGO is ascribed to enhanced diffusion properties in the bulk electrochemical reaction sites rather than an increase in the electrical conductivity, which is a surface property.

Original languageEnglish
Pages (from-to)A667-A673
JournalJournal of the Electrochemical Society
Volume162
Issue number4
DOIs
Publication statusPublished - 2015 Jan 1

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Oxides
Graphene
Nanocomposites
nanocomposites
graphene
Kinetics
oxides
kinetics
Cyclic voltammetry
diffusion length
surface properties
Surface properties
Ions
electrical resistivity
composite materials
Composite materials
ions

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The electrochemical kinetic properties of a Li4Ti5O12 (LTO)/reduced graphene oxide (RGO) nanocomposite were systematically investigated using cyclic voltammetry (CV). Since there are several factors that influence the electrochemical kinetics of LTO depending on the potential scan rate, the kinetic properties of LTO in the nanocomposite were evaluated by analyzing the scan rate dependence of the voltammetric charge, as measured by CV. When we formed a nanocomposite of LTO and electrically conductive RGO, the number of surface electrochemical reaction sites increased and that of the bulk electrochemical reaction sites decreased. This led to an improvement in the kinetics related to Li+ ion diffusion in LTO. The range of scan rates for which the voltammetric charge was decreased by the kinetic limitations ascribed to diffusion was reduced because of the decrease in the effective diffusion length and the increase in the diffusion area, compared to commercial LTO particles. Thus, unlike previous studies, we report that the improved rate capability of the composite with RGO is ascribed to enhanced diffusion properties in the bulk electrochemical reaction sites rather than an increase in the electrical conductivity, which is a surface property.",
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Electrochemical kinetics investigation of Li4Ti5O12/reduced graphene oxide nanocomposite using voltammetric charge analysis. / Yoon, Seung Beom; Kim, Hyun Kyung; Roh, Kwang Chul; Kim, Kwang Bum.

In: Journal of the Electrochemical Society, Vol. 162, No. 4, 01.01.2015, p. A667-A673.

Research output: Contribution to journalArticle

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