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Oxygen reduction reaction in solid oxide fuel cells

Kamboj, V and Ranjan, C (2022) Oxygen reduction reaction in solid oxide fuel cells. [Book Chapter]

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Official URL: https://doi.org/10.1016/B978-0-323-88508-9.00011-2


Solid oxide fuel cells (SOFCs) remain one of the most commercially well-established technologies. In recent years, they have gained enormous attention because of their excellent efficiency and fuel flexibility. At the heart of a typical SOFC cell lies is a ceramic membrane electrode assembly which consists of an air cathode and a fuel anode separated by a dense solid electrolyte. The chemistry of SOFCs essentially involves a gas–solid electrode interface operational at high temperatures (600–1000°C). The presence of a dense oxygen ion-conducting solid electrolyte which is ionically connected to two catalytically active electrodes results in complexities at the level of material synthesis and interface engineering. As in other fuel cell systems, the oxygen reduction reaction remains one of the most challenging reactions within the SOFC. But, by the sheer nature of the solid-ceramic design, additional challenges such as compatibility of thermal expansion coefficients of materials, temperature-sensitive ionic conductivity arise. The materials, operational principles, degradation mechanisms, and strategies to mitigate them are very different from conventional ambient temperature liquid electrolyte-based designs. This has significant consequences in both material design and measurement strategies. A considerable amount of material research has gone into developing materials and interfaces that can carry out the desired catalytic reactions besides conducting ions and electrons to the required interfaces. A host of materials that include perovskites such as LaSrMnO x , double perovskites (e.g., Sr2FeMoO x ), Riddlesden–Popper phases (e.g., La2NiO4), pyrochlores, and many more phases have been discussed in the chapter. The chapter introduces the readers to basic concepts and measurement strategies in SOFCs. Special attention has been paid to material design principles, synthesis techniques, and deposition strategies to obtain the desired interfaces. The chapter also covers challenges to ORR activity and electrode stability arising out of material instability or environmental factors such as the presence of H2O and CO2. Wherever possible, an attempt has been made to emphasize the chemical principles behind the choice and design of materials.

Item Type: Book Chapter
Publication: Oxygen Reduction Reaction: Fundamentals, Materials, and Applications
Publisher: Elsevier
Additional Information: The copyright for this article belongs to Elsevier.
Keywords: ORR activity; Perovskite; Pyrochlores; Riddlesden–Popper phase; Solid electrolyte
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 06 Oct 2022 08:45
Last Modified: 06 Oct 2022 08:45
URI: https://eprints.iisc.ac.in/id/eprint/77148

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