Factors controlling the electrochemical potential window for diamond electrodes in non-aqueous electrolytes

M. Yoshimura, K. Honda, T. Kondo, R. Uchikado, Yasuaki Einaga, Tata N. Rao, D. A. Tryk, A. Fujishima

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The electrochemical behavior of as-deposited diamond was examined in various non-aqueous solvents and supporting electrolytes. The potential for the onset of anodic current was found to be dependent on the nature of the organic solvent, whereas that for the onset of cathodic current was dependent on the type of supporting salt cation. These results indicate that outer-sphere decomposition reactions of the organic solvents are the most important in determining the oxidation potential limit, and those involving cations are the most important in determining the reduction potential limit. These oxidations and reductions were correlated to the HOMO and LUMO energies of the solvents and the supporting electrolyte cations, respectively. The correlations were found to be linear. Electrical double-layer capacitance values were also found to be dependent on the type of electrolyte, and correlations were observed between the capacitance values and the molecular volumes of the solvent as well as between the capacitance and the volumes of the supporting electrolyte cations. The experimental results clearly indicate that the electrical double-layer capacitance values decrease, whereas the thickness of the Helmholz layer increases with increasing volume of the solvated cations.

Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalDiamond and Related Materials
Volume11
Issue number1
DOIs
Publication statusPublished - 2002 Jan
Externally publishedYes

Fingerprint

nonaqueous electrolytes
Diamond
Electrolytes
Cations
Diamonds
Positive ions
diamonds
cations
Capacitance
Electrodes
capacitance
electrodes
electrolytes
Organic solvents
Oxidation
oxidation
Salts
salts
Decomposition
decomposition

Keywords

  • Diamond electrode
  • Electrical double-layer capacitance
  • Electrical potential window
  • Non-aqueous electrolytes
  • Outer-sphere reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Factors controlling the electrochemical potential window for diamond electrodes in non-aqueous electrolytes. / Yoshimura, M.; Honda, K.; Kondo, T.; Uchikado, R.; Einaga, Yasuaki; Rao, Tata N.; Tryk, D. A.; Fujishima, A.

In: Diamond and Related Materials, Vol. 11, No. 1, 01.2002, p. 67-74.

Research output: Contribution to journalArticle

Yoshimura, M. ; Honda, K. ; Kondo, T. ; Uchikado, R. ; Einaga, Yasuaki ; Rao, Tata N. ; Tryk, D. A. ; Fujishima, A. / Factors controlling the electrochemical potential window for diamond electrodes in non-aqueous electrolytes. In: Diamond and Related Materials. 2002 ; Vol. 11, No. 1. pp. 67-74.
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