Abstract
PrxCe1-xO2-δ can potentially serve as both cathode and anode in solid oxide fuel cells given that it exhibits significant mixed ionic-electronic conductivity (MIEC) under both cathodic and anodic conditions. While MIEC depends strongly on oxygen nonstoichiometry δ, there have been few ways to extract this information reliably and in situ, particularly for thin films. In this work, this is achieved by analysis of chemical capacitance values extracted from impedance spectroscopy data obtained on electrochemical cells of the form Pr0.1Ce0.9O2−δ/ Y0.16Zr0.84O1.92 / Pr0.1Ce0.9O2−δ operating at temperatures between 500 to 700 oC and over the pO2 range of 10-31-10-16 atm. The enthalpy of reduction for the Pr0.1Ce0.9O2−δ thin film is derived.
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