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Research Article

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

Aixian Shan1,2, Shuoyuan Huang1, Haofei Zhao1, Wengui Jiang1, Xueai Teng1, Yingchun Huang3, Chinping Chen2( ), Rongming Wang1( ), Woon-Ming Lau1,3( )
Beijing Advanced Innovation Center for Materials Genome Engineering, Center for Green Innovation, Beijing Key Laboratory for Magneto- Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
Department of Physics, Peking University, Beijing 100871, China
Shunde Graduate School of University of Science and Technology Beijing, Foshan 528300, China
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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/oleic- acid 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 Ni0.69Pt0.31 truncated octahedrons, Ni0.45Pt0.55 nanomultipods and Ni0.20Pt0.80 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/mgPt for Ni0.20Pt0.80 nanoflowers, 1.2 A/mgPt for Ni0.45Pt0.55 nanomultipods, 0.7 A/mgPt for Ni0.69Pt0.31 truncated octahedrons, and 0.6 A/mgPt 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 Ni0.20Pt0.80 nanoflowers.

Keywords

surface-strainhigh-index facetsNi-Pt alloycontrollable synthesiselectrocatalysis

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 3088-3097
DOI: 10.1007/s12274-020-2978-3
Cite this article:
Shan A, Huang S, Zhao H, et al. Atomic-scaled surface engineering Ni-Pt nanoalloys towards enhanced catalytic efficiency for methanol oxidation reaction. Nano Research, 2020, 13(11): 3088-3097. https://doi.org/10.1007/s12274-020-2978-3
Topics:
Binary alloysCatalystsCatalytic oxidation Density functional theoryPlatinum alloys

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Received: 26 May 2020
Revised: 08 July 2020
Accepted: 09 July 2020
Published: 18 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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