Probing Bias-Dependent Electrochemical Gas–Solid Reactions in (LaxSr1–x)CoO3–δ Cathode Materials (pages 5027–5036)
Amit Kumar, Francesco Ciucci, Donovan Leonard, Stephen Jesse, Mike Biegalski, Hans Christen, Eva Mutoro, Ethan Crumlin, Yang Shao-Horn, Albina Borisevich and Sergei V. Kalinin
Version of Record online: 17 APR 2013 | DOI: 10.1002/adfm.201202401
Spatial variability of bias-dependent electrochemical processes on a (La0.5Sr0.5)2CoO4±δ modified (LaxSr1–x)CoO3–δ surface is studied using first-order reversal curve method in electrochemical strain microscopy. Reversible oxygen reduction/evolution reaction (ORR/OER) is activated at voltages as low as 3–4 V. The degree of bias-induced transformation increases with applied bias. ORR/OER is shown to be activated in grains at relatively low biases and larger voltages at grain boundaries.