In situ raman spectroelectrochemistry of oxygen species on gold electrodes in high temperature molten carbonate melts

Takashi Itoh, Koji Abe, Kaoru Dekko, Mohamed Mohamedi, Isamu Uchida, Atsuo Kasuya

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20 Citations (Scopus)

Abstract

In order to clarify the reaction mechanisms for oxygen reduction related to Superoxide and peroxide ions in molten carbonates, we have attempted to obtain in situ Raman spectra on a gold electrode by a surface-enhanced Raman scattering technique at the three-phase boundary under potentiostatic conditions. In situ experiments were carried out with a gold electrode in molten (62 + 38)mol% (Li + K)CO3 eutectic at 923 K and in molten Li2CO3, at 1123 K. Raman lines at 1047, 1080, and 800 cm-1 appeared for the (62 + 38)mol% (Li + K)CO3, and at 735 cm-1 for the Li2CO3 single melt. These Raman lines are assigned to the stretching vibration of Superoxide ions (1047 and 1080 cm-1), and peroxide ions (800 and 735 cm-1). These oxide species may be associated with the oxygen reduction at the three-phase boundary interface. The results suggest the oxygen reduction in a Li2CO3 melt involves peroxide ions, while the reduction in a (62 + 38)mol% (Li + K)CO3 melt involves both peroxide and Superoxide ions.

Original languageEnglish
Pages (from-to)A2042-A2046
JournalJournal of the Electrochemical Society
Volume151
Issue number12
DOIs
Publication statusPublished - 2004

ASJC Scopus subject areas

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

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