fig3

Figure 3. (A) Feature importance of the ionic descriptors based on the sensitivity analysis of the ANN model; (B) ASR values of Sr_0.9Cs_0.1Co_0.9Nb_0.1O₃ in a symmetrical cell measured for 800 h in air at 550 °C; (C) ML-assisted process for predicting oxygen vacancy concentrations; The ORR activity at 450 °C as a function of the (D) measured and (E) ML-predicted oxygen vacancy concentration. A-site and B-site: In cathode materials, ABO₃-type perovskite oxides, such as LaCoO₃, LaCrO₃, LaNiO₃, etc., are commonly studied. For the doping of these oxides, the cell where the La element is located is generally referred to as the A-site, and the cell where Co/Cr/Ni is located is the B-site. ISA: Ionic Lewis acids are usually substances capable of accepting electron pairs. ASR: This refers to the resistance encountered when the current passes through a unit area of electrode material. Tolerance factor (t): A parameter used to measure the relationship between the size of different ionic radii and the stability of the crystal structure in a given crystal structure. Ionic electronegativity: A measure of an atom’s ability to attract electrons when forming an ionic bond. It reflects the combined effect of an atom’s electron affinity and ionization potential in a molecule or crystal. ANN: Artificial neural network; ASR: area-specific resistance; ML: machine learning; ORR: oxygen reduction reaction.