Graphene-supported non-precious metal electrocatalysts for oxygen reduction reactions: the active center and catalytic mechanism

摘要: In this work, non-precious metal catalysts (FeCoN) were loaded onto the surface of N-modified graphene (N-G), graphite and activated carbon during a simple yet effective chemical process. The oxygen reduction reaction (ORR) performance as-prepared with different pyrolysis temperatures evaluated in 0.5 M H2SO4. use N-G at temperature 750 °C yielded highest catalyst activity, while both nitrides (MeN) pyridinic N demonstrated as active center for ORR. pyridinic-N, which sits surrounding MeN works synergistically to enhance catalytic activity MeN/N-G composite. A maximum power density output 130 mW cm−2 0.25 V was achieved membrane electrode assembly (MEA) using FeCoN-N-G cathode catalyst. mechanism ORR nature are discussed.