Abstract
Solid oxide cells are among the most promising technologies for energy or chemical production as fuel cells or electrolyzers, respectively. In this context, the choice of oxygen electrode materials plays a vital role in the oxygen reduction reaction (ORR) and in the oxygen evolution reaction (OER). Here, the combination of important structural, chemical, physical, microstructural, and electrical characteristics is necessary to maximize the kinetics of these reactions for these applications. For this reason, this chapter summarizes the basic mechanisms that govern ORR and OER, the currently available electrode materials used for these applications, the most used characterization techniques for the determination of critical parameters such as surface exchange and oxygen diffusion, and the failure mechanism of oxygen electrodes for high-temperature electrolyzers.
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