Tuning the Co Oxidation State in Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta)by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity - Aegerter, D; Borlaf, M; Fabbri, E; Clark, AH; Nachtegaal, M; Graule, T; Schmidt, TJ (Catalysts, 2020)