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Donovan N. Leonard, Amit Kumar, Stephen Jesse, Michael D. Biegalski, Hans M. Christen, Eva Mutoro, Ethan J. Crumlin, Yang Shao-Horn, Sergei V. Kalinin and Albina Y. Borisevich Nanoscale Probing of Voltage Activated Oxygen Reduction/Evolution Reactions in Nanopatterned (LaxSr1-x)CoO3-δ Cathodes Advanced Energy Materials 3

Article first published online: 4 MAR 2013 | DOI: 10.1002/aenm.201200681

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Mechanisms of electrochemical processes in a cobaltite film are studied using dynamic electrochemical strain microscopy. The reversible oxygen reduction/evolution process starts at 3–4 V, and an irreversible process causing surface deformation manifests above 10–12 V. Post-mortem focused-ion beam milling and atomic resolution electron microscopy show that surface deformation is due to local amorphization.

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