Abstract
Bismuth ruthenate and erbia-stabilized bismuth oxide (ESB) composites were studied as prospective cathode materials for solid oxide fuel cells (SOFCs) operating at intermediate temperatures (IT). Phase chemistry between bismuth ruthenate and ESB was studied using differential thermal analysis and X-ray diffraction (XRD). Symmetrical cells were fabricated on gadolinium- doped ceria electrolytes and studied by electrochemical impedance spectroscopy. -ESB composite electrodes showed area specific resistance values significantly lower than single-phase bismuth ruthenate electrodes, with the best performance from composite electrodes containing ESB. At , composite electrodes containing ESB exhibited an area specified resistance of as compared to for . Introduction of the ESB phase reduced the rate limiting charge transfer and surface-diffusion steps in the oxygen reduction reaction, resulting in improved electrode performance.
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