期刊
ADVANCED ENERGY MATERIALS
卷 7, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201601172
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资金
- National Natural Science Foundation of China [21376122, 21273116]
- National and Local Joint Engineering Research Center of Biomedical Functional Material
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science Engineering [DE-SC0005397]
A promising bifunctional electrocatalyst is reported for air cathodes consisting of Ni3Fe nanoparticles embedded in porous nitrogen-doped carbon sheets (Ni3Fe/N-C sheets) by a facile and effective pyrolysis-based route with sodium chloride (NaCl) crystals as a template. The Ni3Fe/N-C sheets show excellent catalytic activity, selectivity, and durability toward both the oxygen-reduction and oxygen-evolution reactions (ORR and OER). They are shown to provide a superior, low-cost cathode for a rechargeable Zn-air battery. At a discharge-charge current density of 10 mA cm(-2), the Ni3Fe/N-C sheets enable a Zn-air battery to cycle steadily up to 420 h with only a small increase in the round-trip overpotential, outperforming the more costly Pt/C + IrO2 mixture catalyst (160 h). With the simplicity and scalability of the synthetic approach and its remarkable bifunctional electrocatalytic performance, the Ni3Fe/N-C sheets offer a promising rechargeable air cathode operating at room temperature in an alkaline electrolyte.
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