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Atomic-scaled surface engineering Ni-Pt nanoalloys towards enhanced catalytic efficiency for methanol oxidation reaction.
- Source :
- Nano Research; Nov2020, Vol. 13 Issue 11, p3088-3097, 10p
- Publication Year :
- 2020
-
Abstract
- 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<subscript>0.69</subscript>Pt<subscript>0.31</subscript> truncated octahedrons, Ni<subscript>0.45</subscript>Pt<subscript>0.55</subscript> nanomultipods and Ni<subscript>0.20</subscript>Pt<subscript>0.80</subscript> 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<subscript>Pt</subscript> for Ni<subscript>0.20</subscript>Pt<subscript>0.80</subscript> nanoflowers, 1.2 A/mg<subscript>Pt</subscript> for Ni<subscript>0.45</subscript>Pt<subscript>0.55</subscript> nanomultipods, 0.7 A/mg<subscript>Pt</subscript> for Ni<subscript>0.69</subscript>Pt<subscript>0.31</subscript> truncated octahedrons, and 0.6 A/mg<subscript>Pt</subscript> 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<subscript>0.20</subscript>Pt<subscript>0.80</subscript> nanoflowers. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 13
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 145492523
- Full Text :
- https://doi.org/10.1007/s12274-020-2978-3