“…Development of electrocatalysts with high activity and durability toward the oxygen reduction reaction (ORR) is of great importance because the sluggish kinetics at the cathode usually limits the energy conversion efficiency and performance of fuel cells. − Nowadays, the high-performance electrocatalysts developed and broadly employed for ORR still depend on precious platinum (Pt) and its alloys, yet they still suffer numerous obstacles, including high cost, limited reserve, and various instability problems of Pt for large-scale commercialization. − Therefore, alternative solutions based on carbon-based non-noble metal catalysts, as well as their derivatives and related composites, such as metal oxides, , metal sulfide, , heteroatom doped, − etc., have been explored to develop optimal materials for ORR catalysis over the past decade. Especially, metal/nitrogen-codoped carbon (M/N-C, M = Fe, Co, Ni, etc.…”