Electrochemically Seed-Mediated Synthesis of Sub-10 nm Tetrahexahedral Pt Nanocrystals Supported on Graphene with Improved Catalytic Performance

Controlling the surface structure of Pt nanocrystals (NCs), especially creating high-index facets with abundant active step sites, is an effective approach to enhance catalytic performances. However, the available high-index faceted Pt NCs have large particle sizes, which severely impedes their prac...

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Veröffentlicht in:Journal of the American Chemical Society 2016-05, Vol.138 (18), p.5753-5756
Hauptverfasser: Liu, Shuo, Tian, Na, Xie, Ai-Yun, Du, Jia-Huan, Xiao, Jing, Liu, Li, Sun, Hong-Yu, Cheng, Zhi-Ying, Zhou, Zhi-You, Sun, Shi-Gang
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Sprache:eng
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Zusammenfassung:Controlling the surface structure of Pt nanocrystals (NCs), especially creating high-index facets with abundant active step sites, is an effective approach to enhance catalytic performances. However, the available high-index faceted Pt NCs have large particle sizes, which severely impedes their practical applications. In this study, we reported a new electrochemically seed-mediated method, by which sub-10 nm tetrahexahedral Pt NCs (THH Pt NCs) enclosed with {210} high-index facets supported on graphene were synthesized. Pt nanoparticles of ∼3 nm in size as high-density crystal seeds play a key role in the small-sized control. The obtained THH Pt NCs exhibited a higher mass activity than commercial Pt/C catalyst for ethanol electrooxidation. We further demonstrated that this method is also valid for reshaping commercial Pt/C, to create high-index facets on surfaces and thus to improve both mass activity and stability.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b13473