Graphene hydrogel bridged pyrolysis strategy: Carbon cladded Fe2N nanoparticles in graphene matrix for efficient oxygen reduction reaction
The development of efficient, durable and inexpensive materials as alternatives to precious-metal-based catalyst towards oxygen reduction reaction (ORR) is extremely desirable but challenging. Herein, a facile hydrogel-bridged pyrolysis strategy was presented to construct N-doped graphene embedded with Fe 2 N nanoparticles (NPs) as an efficient ORR catalyst. By virtue of the synergistic contribution of enhanced mass transfer derived from graphene hydrogel network and intrinsic catalytic activity of well-dispersed Fe 2 N NPs, the as-prepared Fe 2 N/NC-1 exhibits exceptional activity and durability for ORR with an onset potential of 1.06 V and a half-wave potential of 0.90 V vs RHE in 0.1 M KOH, which outperforms the state-of-the-art Pt/C catalyst. Moreover, the carbon-shell structure around the Fe 2 N NPs can be clearly identified, which could benefit the long-term durability, and significantly preserve the catalytic activity and selectivity in acidic media. This work provides an effective method and insightful exploration for the design of non-precious-metal carbon-based electrocatalysts and their application in efficient energy conversion.
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