Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 38, Pages 21511-21520Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06708
Keywords
oxygen electrocatalysts; iron carbide; graphitic layers; oxygen reduction reaction; oxygen evolution reaction
Funding
- National Natural Science Foundation of China [21176083, 21471056, 21236003, 21206042]
- Basic Research Program of Shanghai [13NM1400700, 13NM1400701]
- Fundamental Research Funds for the Central Universities
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It is highly crucial and challenging to develop bifunctional oxygen electrocatalysts for oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs) in rechargeable metal-air batteries and unitized regenerative fuel cells (URFCs). Herein, a facile and cost-effective strategy is developed to prepare mesoporous Fe-N-doped graphene-like carbon architectures with uniform Fe3C nanoparticles encapsulated in graphitic layers (Fe3C@NG) via a one-step solid-state thermal reaction. The optimized Fe3C@NG800-0.2 catalyst shows comparable ORR activity with the state-of-the-art Pt/C catalyst and OER activity with the benchmarking RuO2 catalyst. The oxygen electrode activity parameter Delta E (the criteria for judging the overall catalytic activity of bifunctional electrocatalysts) value for Fe3C@NG800-0.2 is 0.780 V, which surpasses those of Pt/C and RO2 catalysts as well as those of most nonprecious metal catalysts. Significantly, excellent long-term catalytic durability holds great promise in fields of rechargeable metal-air batteries and URFCs.
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