Electrode Kinetics at the Palladium/Ceramic Oxide Electrolyte Interface

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Abstract
The high temperature electrochemistry of the palladium/stabilized zirconia interface has been studied as a function of temperature and oxygen partial pressure by impedance spectroscopy and potentiodynamic methods. Two arcs for the electrode impedance were observed above the thermodynamic decomposition temperature of . At a temperature immediately below this, the interfacial resistance increased by approximately two orders of magnitude. This large increase in electrode resistance was attributed to a cathodic charge transfer reaction. This observation has been exploited to develop new oxygen sensors. The energy of activation for the electrode processes was calculated at temperatures above the decomposition temperature of .
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