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Oxygen exchange kinetics on solid oxide fuel cell cathode materials—general trends and their mechanistic interpretation

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Abstract

The compilation of measured effective rate constants for oxygen surface exchange on mixed conducting perovskites, which covers a great variety of compositions ranging from (La,Sr)MnO3−δ to (La,Sr)(Co,Fe)O3−δ and (Ba,Sr)(Co,Fe)O3−δ, demonstrates the importance of ionic conductivity—i.e., high oxygen vacancy concentration as well as vacancy mobility—as a key factor for the surface oxygen exchange rate. This interpretation is corroborated by ab initio calculations, which indicate that the approach of an oxygen vacancy to oxygen intermediates adsorbed on the surface is the rate determining step for a number of perovskites.

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Acknowledgment

The authors thank G. Cristiani, B. Stuhlhofer, S. Schmid for PLD film preparation and microelectrode structuring, and G. Gδtz for XRD (MPI for Solid State Research, Stuttgart), J. Fleig (Technical University, Vienna), M.M. Kuklja (University of Maryland), and E. Heifets for fruitful discussions. L.W. thanks the Hans L. Merkle-Stiftung im Stifterverband fur die Deutsche Wissenschaft for financial support and Y.A.M. was partly supported by EC FP7 NASA-OTM (Grant No. 228701).

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  1. Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany

    Lei Wang, Rotraut Merkle, Yuri A. Mastrikov, Eugene A. Kotomin & Joachim Maier

  2. University of Maryland, College Park, Maryland, 20742-2115, USA

    Yuri A. Mastrikov

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  1. Lei Wang
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Wang, L., Merkle, R., Mastrikov, Y.A. et al. Oxygen exchange kinetics on solid oxide fuel cell cathode materials—general trends and their mechanistic interpretation. Journal of Materials Research 27, 2000–2008 (2012). https://doi.org/10.1557/jmr.2012.186

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