Abstract
The electrochemical oxidation of H2 and CO was studied on Ni- CeO2 anodes using a specific cell design characterized by a Luggin-type reference electrode. The consistency of this configuration was verified theoretically using a numerical model. The oxidation rates were measured by cyclic- voltammetry and electrochemical impedance spectroscopy (EIS) at temperatures between 700 and 800{degree sign}C and at different H2 and CO partial pressures. EIS results were analyzed following a validation and deconvolution procedure. EIS fitting parameters were rationalized using a method developed for conventional Ni-YSZ anodes. Typically, two main arcs composed the complex impedance of Ni/CeO2. In H2, the charge transfer reactions were not limiting but the rate of the process related to the lower peak-frequency arc decreased with anodic overpotential, indicating diffusion limitations in this region. In CO, charge transfer limitations were evident. The design and procedure developed in this study is useful for characterizing the processes in SOFC anodes.
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