Electrochemically Seed-Mediated Synthesis of Sub-10 nm Tetrahexahedral Pt Nanocrystals Supported on Graphene with Improved Catalytic Performance
Electrochemically Seed-Mediated Synthesis of Sub-10 nm Tetrahexahedral Pt Nanocrystals Supported on Graphene with Improved Catalytic Performance
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石墨烯负载的亚 10 nm 四六面体 Pt 纳米晶体的电化学种子介导合成具有改进的催化性能
DOI：
10.1021/jacs.5b13473
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发表时间：
2016
影响因子：
15
通讯作者：
Sun Shi Gang
中科院分区：
文献类型：
--
作者：
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
控制Pt纳米晶体的表面结构，特别是创造具有丰富活性阶位的高指数切面，是提高催化性能的有效途径。然而，现有的高折射率面形Pt纳米材料颗粒尺寸较大，严重阻碍了其实际应用。在这项研究中，我们报道了一种新的电化学种子介导方法，通过石墨烯支撑的{210}高折射率面包裹的亚10 nm的四面体Pt NCs （THH Pt NCs）合成。尺寸为~ 3nm的Pt纳米颗粒作为高密度晶体种子在小尺寸控制中发挥关键作用。所制得的THH Pt NCs在乙醇电氧化中表现出比商用Pt/C催化剂更高的质量活性。我们进一步证明，这种方法也适用于重塑商业Pt/C，在表面上创建高指数面，从而提高质量活性和稳定性。
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.