Mn–N–C with High‐Density Atomically Dispersed Mn Active Sites for the Oxygen Reduction Reaction

. Notably, the durability of the Mn-N-C catalyst in PEMFC is reported for the first time, showing only 18.4% decay after 30 000 square-wave cycles. This work provides a unique perspective and a systematic design strategy for building feasible nonprecious metal catalysts with a high active site density, addressing the challenges of inefficiency and performance limitations across various electrocatalytic applications.