HIGH TEMPERATURE ELECTROCHEMICAL REDUCTION OF THE WATER MOLECULE AT CERIUM DIOXIDE ELECTRODES
The high temperature cathodic reduction of the water molecule at the interface Pt/CeO-(2-x) Double Layer Electrode - Yttria Stabilized Zirconia has been investigated. Two different rate determining processes are involved depending on the current density. In the low current density range a Tafel's type kinetic behaviour was found, with an activation free enthalpy around 22 kcal/mole. The rate determining process has been identified in the transport of the oxygen atoms through the CeO-(2-x) layer. At high currents a lack of any apparent additional, nonohmic contribution to the total overvoltage was put into evidence. At any rate, such DLE resulted in a worsening of the energetic yield of the cathodic process with respect to the porous platinum/YSZ as well as Pt/cerium doped YSZ.
Bibliographic Reference: SOLID STATE IONICS, VOL. 15 (1985), PP. 335-343
Record Number: 1989124031000 / Last updated on: 1987-01-01
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