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O2 reduction can occur via 1e−, 2e−, and 4e− pathways to yield O2−, H2O2, and H2O, respectively. Experimentally, it is often difficult to distinguish between the 1e− and 2e− pathways because O2− rapidly disproportionates in acidic and neutral aqueous solutions to H2O2 and O2. In this manuscript, we combine a mathematical model with previous experimental results with O2 reduction electrocatalysts on...