Electrochemically Seed-Mediated Synthesis of Sub-10 nm Tetrahexahedral Pt Nanocrystals Supported on Graphene with Improved Catalytic Performance
详细信息 查看全文
- 作者：Shuo Liu ; Na Tian ; Ai-Yun Xie ; Jia-Huan Du ; Jing Xiao ; Li Liu ; Hong-Yu Sun ; Zhi-Ying Cheng ; Zhi-You Zhou ; Shi-Gang Sun
- 刊名：Journal of the American Chemical Society
- 出版年：2016
- 出版时间：May 11, 2016
- 年：2016
- 卷：138
- 期：18
- 页码：5753-5756
- 全文大小：354K
- 年卷期：0
- ISSN：1520-5126
文摘
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.