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 eutectic at 923 K and in molten at 1123 K. Raman lines at 1047, 1080, and appeared for the and at for the single melt. These Raman lines are assigned to the stretching vibration of superoxide ions (1047 and and peroxide ions (800 and These oxide species may be associated with the oxygen reduction at the three-phase boundary interface. The results suggest the oxygen reduction in a melt involves peroxide ions, while the reduction in a melt involves both peroxide and superoxide ions. © 2004 The Electrochemical Society. All rights reserved.
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