Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 50, Pages 27938-27945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b10083
Keywords
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Funding
- National Natural Science Foundation of China [51271135, 51202180]
- program for New Century Excellent Talents in university [NCET-12-0455]
- Natural Science Foundation of Shaanxi Province [2015JM5166]
- Fundamental Research Funds for the Central Universities
- project of Innovative Team of Shanxi Province [2013KCT-05]
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PtNi3 bimetallic concave octahedrons with a majority of platinum atoms deposited on the frames were synthesized in ethylene glycol solution. The high angle annular dark field scanning transmission electron microscopy (HAAD-STEM) characterizations and energy-dispersive X-ray spectroscopy (EDS) analysis reveal that the Pt frames have a thickness of less than 2 nm, which surround a nickel core thus forming a quasi core-shell concave octahedral nanoparticle (NP). The element-specific anisotropic growth followed by the nanoscale phase segregation and subsequent oxidation of Ni riched facets are responsible for the formation of the concave nanostructure. The PtNi3 quasi core-shell concave octahedrons exhibit substantially enhanced electrocatalytic properties toward methanol oxidation and hydrogen evolution reaction compared with that of the commercial Pt/C, suggesting that the Ni riched Pt-Ni NPs can be used as a potential candidate for methanol oxidation reaction (MOR) or hydrogen evolution reaction (HER) catalysts with the low utilization of Pt.
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