Fig. 2: Correlation between the concentration of oxygen vacancy and ORR activity of cobalt-based perovskite oxides.
From: Prediction of perovskite oxygen vacancies for oxygen electrocatalysis at different temperatures
a Illustration of how area polarization resistance (ASPR) is determined from Nyquist plot over LSCF cathode at 600 °C in a symmetric cell configuration shown in the inset schematics. b, c The ORR activity (mean values ± S.D.) at 450 °C as a function of the (b) measured (mean values ± S.D.) and (c) ML-predicted oxygen vacancy concentration. The measurements of δM and ASPRs were repeated for three times. d The evolution of the optimal oxygen vacancies for ORR activity as a function of operating temperatures. e, f Comparison of DFT-calculated (e) formation and (f) mobility of the oxygen vacancy in the perovskite lattice.
