Low-cost preparation of durable electrocatalysts
is vital for energy
storage and conversion. Here, we integrated two methods of synthesizing
isolated iron atoms into a special carbon matrix as an advanced electrocatalyst.
Atomic Fe isolation and graphene nanomeshes or curved carbon nanoshells
were almost synthesized simultaneously. The hierarchical atomic Fe/carbon
material with 0.53 atom % Fe exhibited superior oxygen reduction reaction
(ORR) performance to Pt–C (20 wt % Pt) with 40 mV more positive
onset potential, larger current density, and stronger methanol-tolerant
capability. We demonstrated that the catalytic active sites were Fe
isolation and coordinated with nitrogen in the porous curved carbon-graphene
matrix. This strategy could be developed into a general approach to
prepare atomic metal/carbon electrocatalysts.
Hetero-layered iron–nitrogen coordination between g-C3N4 and graphene nanomeshes was developed for superior electrocatalytic activity in the oxygen reduction reaction.
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