The high temperature cathodic reduction of the water molecule at the interface PtCeO2-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 CeO2-x layer. At higher currents a lack of any apparent additional, nonohmic contribution to the 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. © 1985.
Barbi, G., Mari, C. (1985). High temperature electrochemical reduction of the water molecule at cerium dioxide electrodes. SOLID STATE IONICS, 15(4), 335-343 [10.1016/0167-2738(85)90138-9].
High temperature electrochemical reduction of the water molecule at cerium dioxide electrodes
MARI, CLAUDIO MARIA
1985
Abstract
The high temperature cathodic reduction of the water molecule at the interface PtCeO2-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 CeO2-x layer. At higher currents a lack of any apparent additional, nonohmic contribution to the 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. © 1985.
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