Spin State versus Potential of Zero Charge as Predictors of Density-Dependent Oxygen Reduction in M-N-C Electrocatalysts
This study demonstrates that the potential of zero charge (PZC), rather than spin state, is the superior predictor for density-dependent oxygen reduction activity and selectivity in M-N-C electrocatalysts, as PZC-driven shifts in the interfacial electric field modulate adsorption energetics to explain performance trends across varying metal-site densities.