期刊
NANO ENERGY
卷 61, 期 -, 页码 397-403出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.04.093
关键词
Alloys; Electrocatalysis; Platinum; Nanocrystals; Fractal
类别
资金
- National Basic Research Program of China [2015CB932301]
- National Key Research and Development Program of China [2017YFA0206500, 2017YFA0206801]
- National Natural Science Foundation of China [21603178, 21671163, 21721001, 21773190, 21802110]
- China Postdoctoral Science Foundation [2016M602066, 2017T100468]
Architectural engineering of noble metal nanocrystals can result in structural diversity and complexity, thereby providing catalysts with multifunctional properties. Herein, a unique Sierpinski gasket-like Pt-Ag octahedral alloy nanostructure with a three-dimensional hyperbranched architecture containing abundant well-defined Pt-rich {111} stable facets and dense low-coordinated active sites is reported. Unlike the well-accepted long-range limiting diffusion govened growth model for fractal structures, our success relies on creating local depletion layer near the crystal surface by surfactant. The as-prepared Sierpinski gasket-like Pt-Ag octahedral nanocrystals allows us to achieve three milestones for electrocatalysts, i.e. high catalytic activity, great durability, and stability towards the methanol oxidation reaction in acidic media. Specifically, the catalyst shows a high specific activity (6.61 mA cm(-2), is superior than most of reported Pt-based catalysts), outstanding COads-poisoning tolerance and stability (the morphology and composition of the catalyst are preserved after 2000 cycles). This study points to a new approach to develop highly efficient catalysts in the form of fractal nanostructures with structural diversity and complexity to balance the delicate trade-off between activity and stability of catalysts.
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