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Size dependent oxygen reduction and methanol oxidation reactions: catalytic activities of PtCu octahedral nanocrystals

机译：大小的依赖减少氧气和甲醇氧化反应:催化PtCu活动八面体纳米晶体

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The synthetic control through colloidal synthesis led to a remarkable increase in platinum mass activity in octahedral nanocrystals with a Pt-rich surface. In this manuscript, we demonstrate that the ratio of surfactant can tune the size of Pt surface enriched PtCu nano-octahedra from 8 to 18 nm with homogeneous size and shape on the carbon support. For the nano-octahedra, the Pt-rich surface has been determined by high-angle annular dark field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. The Pt-rich surface exhibits an increasing compressive strain with increasing surface of the {111} facets. With increasing surface, the PtCu nano-octahedra display higher oxygen reduction reaction (ORR) activity, which however leads to higher onset over-potentials in the methanol oxidation reaction (MOR) and CO-stripping. This observed trend for a series of size-selected nano-octahedra demonstrates the benefits of controlling the strained {111} Pt surface for the ORR and MOR activity.
机译：通过胶体合成合成控制导致铂金质量显著增加活动在八面体纳米晶体Pt-rich表面。证明表面活性剂的比例可以调整Pt表面丰富PtCu的大小与均匀nano-octahedra从8到18海里大小和形状的碳的支持。nano-octahedra, Pt-rich表面由高纬度环形暗场决定扫描透射电子显微镜和能量色散x射线光谱。表面展示越来越压缩应变增加表面的{111}面。增加表面,PtCu nano-octahedra显示更高的氧还原反应(ORR)活动,然而导致更高的发作over-potentials甲醇氧化(铁道部)和CO-stripping反应。为一系列size-selected趋势nano-octahedra演示的好处控制紧张的{111}Pt的表面奥尔和铁道部活动。

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