Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 34, Pages 28509-28516Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06153
Keywords
graphene; Fe; core-shell; pH-universal; oxygen reduction reaction
Funding
- Shanghai Municipal Natural Science Foundation [17ZR1432200]
- National Natural Science Foundation of China [21774095]
- Fundamental Research Funds for the Central Universities [0400219376]
- Tongji University
- Young Thousand Talented Program
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Development of high-performance nonprecious metals and their nanocomposites as oxygen reduction electrocatalysts is critical but still challenging for fuel cells and metal-air batteries. Here, we introduce a synthetic strategy to fabricate graphite-wrapped Fe core-shell nanoparticles anchored on graphene as an efficient and stable pH-universal electrocatalyst for oxygen reduction reaction (ORR). The coordination among Fe3+, ellagic acid, and graphene oxide would drive the formation of a sandwichlike assembly, which was subsequently converted into graphene-supported Fe@graphitic carbon core-shell nanoparticles (denoted as GEF). The obtained GEFs exhibited remarkable ORR activity and durability in a wide range of pHs. Most notably, GEF pyrolized at 900 degrees C showed that the onset and half-wave potential at 1.01 and 0.90 V were more positive than those of a commercial Pt/C (onset and half-wave potential: 0.94 and 0.84 V) in alkaline media. Meanwhile, it also demonstrated comparable or even better activity as compared with the commercial Pt/C catalysts in acidic and neutral electrolytes.
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