Atomic-scaled surface engineering Ni-Pt nanoalloys towards enhanced catalytic efficiency for methanol oxidation reaction

Surface engineering is known as an effective strategy to enhance the catalytic properties of Pt-based nanomaterials. Herein, we report on surface engineering Ni-Pt nanoalloys with a facile method by varying the Ni doping concentration and oleylamine/oleicacid surfactant-mix. The alloy-composition, e...

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Bibliographic Details
Published in:Nano research 2020-11, Vol.13 (11), p.3088-3097
Main Authors: Shan, Aixian, Huang, Shuoyuan, Zhao, Haofei, Jiang, Wengui, Teng, Xueai, Huang, Yingchun, Chen, Chinping, Wang, Rongming, Lau, Woon-Ming
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Catalysis
Catalysts
Chemistry and Materials Science
Condensed Matter Physics
Density functional theory
Efficiency
Lattice strain
Materials Science
Methanol
Nanoalloys
Nanomaterials
Nanotechnology
Octahedrons
Oxidation
Platinum
Research Article
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Summary:Surface engineering is known as an effective strategy to enhance the catalytic properties of Pt-based nanomaterials. Herein, we report on surface engineering Ni-Pt nanoalloys with a facile method by varying the Ni doping concentration and oleylamine/oleicacid surfactant-mix. The alloy-composition, exposed facet condition, and surface lattice strain are, thereby manipulated to optimize the catalytic efficiency of such nanoalloys for methanol oxidation reaction (MOR). Exemplary nanoalloys including Ni 0.69 Pt 0.31 truncated octahedrons, Ni 0.45 Pt 0.55 nanomultipods and Ni 0.20 Pt 0.80 nanoflowers are thoroughly characterized, with a commercial Pt/C catalyst as a common benchmark. Their variations in MOR catalytic efficiency are significant: 2.2 A/mg Pt for Ni 0.20 Pt 0.80 nanoflowers, 1.2 A/mg Pt for Ni 0.45 Pt 0.55 nanomultipods, 0.7 A/mg Pt for Ni 0.69 Pt 0.31 truncated octahedrons, and 0.6 A/mg Pt for the commercial Pt/C catalysts. Assisted by density functional theory calculations, we correlate these observed catalysis-variations particularly to the intriguing presence of surface interplanar-strains, such as {111} facets with an interplanar-tensile-strain of 2.6% and {200} facets with an interplanar-tensile-strain of 3.5%, on the Ni 0.20 Pt 0.80 nanoflowers.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2978-3