fig1

Figure 1. (A) ORR mechanism in acidic (blue line) and alkaline (red line) electrolytes and proposed pathways for ORR. Reproduced with the permission of Ref.^[31] Copyright 2021, Elsevier. (B) Trends in oxygen reduction activity plotted as a function of the oxygen binding energy. Reproduced with permission of Ref.^[34] Copyright 2004, American Chemical Society. (C) Relationship between the d-band center of Pt and the current density at 0.9 V (vs. RHE) for the ORR. The Pt NPs were deposited on support materials (a)-(s) shown on the right. Reproduced with the permission of Ref.^[36] Copyright 2021, American Chemical Society.