LAUSR

We reported a detailed mechanistic study of the oxygen reduction reaction (ORR) on the model Ag(111) surface in alkaline solution by using density functional theory (DFT) and Kinetic Monte Carlo (KMC) simulations, in which multiple pathways involving either 2 e− or 4 e− mechanisms were included. The theoretical modelling presented is able to reproduce the experimentally measured polarization curves in both low and high potential regions. An electrochemical 4 e− network including both a chemisorbed water (*H2O)‐mediated 4 e− associative pathway and the conventional associative pathway was identified to dominate the ORR mechanism. On the basis of the mechanistic understanding derived from these calculations, the ways to promote the ORR on Ag(111) were provided, including facilitating *OH removal, **O2 reduction by *H2O, and suppressing **O2 desorption. Finally, the origin of the different ORR behaviors of Ag(111) and Pt(111) was also discussed in detail.