期刊
ADVANCED MATERIALS
卷 34, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202109188
关键词
core-shell structures; epitaxial growth; highly crystalline nanocages; interfacial lattice plane mismatch; oxygen reduction reaction
类别
资金
- National Basic Research Program of China [2017YFA0206702]
- Natural Science Foundation of China [21925110, 21890751, 91745113, 22102170]
- National Program for Support of Top-Notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK 2060190084]
- Major Program of Development Foundation of Hefei Center for Physical Science and Technology [2016FXZY001]
- Users with Excellence Project of Hefei Science Center CAS [2021HSC-UF004]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB36000000]
The epitaxial growth of highly crystalline Pt3Ni overlayer on earth-abundant nickel carbide is reported, forming Ni3C@Pt3Ni core-shell nanoparticles with a well-defined interface through a new lattice-match-directed synthetic strategy. Derived from such core-shell nanostructures, ultrathin highly crystalline Pt3Ni nanocages have an advantageous configuration of oxygen reduction reaction (ORR)-favored facets and inherently high active surface area for the ORR, bringing high mass activity and specific activity.
Structure engineering strategies such as core-shell and hollow nanostructures are effective pathways to improve the utilization of noble metals for catalysis. However, nowadays materials design based on these strategies still largely rely on precious metal templates. Herein, the epitaxial growth of highly crystalline Pt3Ni overlayer on earth-abundant nickel carbide is reported, forming Ni3C@Pt3Ni core-shell nanoparticles with a well-defined interface through a new lattice-match-directed synthetic strategy. Derived from such core-shell nanostructures, ultrathin highly crystalline Pt3Ni nanocages have an advantageous configuration of oxygen reduction reaction (ORR)-favored facets and inherently high active surface area for the ORR, bringing high mass activity and specific activity as much as 4.71 A mg(Pt)(-1) and 5.14 mA cm(-2), which are 26 and 20 times to that of commercial Pt/C, respectively. This novel epitaxial growth of platinum opens up new avenues to rationally design highly active and economical electrocatalysts.
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