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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Pt-Ru and Pt-Ru-P/Carbon Nanocomposites: Synthesis, Characterization, and Unexpected Performance as Direct Methanol Fuel Cell (DMFC) Anode Catalysts
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Pt-Ru and Pt-Ru-P/Carbon Nanocomposites: Synthesis, Characterization, and Unexpected Performance as Direct Methanol Fuel Cell (DMFC) Anode Catalysts

机译:Pt-Ru和Pt-Ru-P /碳纳米复合材料:直接甲醇燃料电池(DMFC)阳极催化剂的合成,表征和意外性能

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摘要

Six Pt-Ru/carbon nanocomposites have been prepared, using five different Pt, Ru-bimetallic precursors as sources of metal. Nanocomposites prepared from precursors lacking phosphorus contain Pt-Ru nanocrystals that are highly dispersed on the carbon support, as expected. However, nanocomposites prepared from precursors possessing phosphorus contain a mixture of face-centered-cubic Pt-Ru alloy nanocrystals and primitivecubic nanocrystals of an interstitial ternary metal phosphide phase identified as PtRuP_2. Nanocomposites containing substantial amounts of nano-PtRuP_2 perform as well as a commercial Pt/Ru/carbon nanocomposite in the role of an anode catalyst in direct methanol fuel cells. Although the exclusion of metal phosphide phases in Pt-Ru nanocomposite syntheses is best achieved by eliminating all sources of phosphorus, the presence of Pt-Ru nanocomposite syntheses is best achieved by eliminating all sources of phosphorus, the presence of PtRuP_2 in such nanocomposites does not poison methanol electrooxidation. Investigation of the synthesis and electrocatalytic reactivity of pure PtRuE_x (where E denotes a main-group heteroelement) phases is suggested.
机译:使用五种不同的Pt Ru-双金属前驱体作为金属源,已经制备了六种Pt-Ru /碳纳米复合材料。如所预期的那样,由缺乏磷的前体制备的纳米复合材料包含高度分散在碳载体上的Pt-Ru纳米晶体。然而,由具有磷的前体制备的纳米复合材料包含面心立方Pt-Ru合金纳米晶体和间隙三元金属磷化物相的原始立方纳米晶体(标识为PtRuP_2)的混合物。含有大量纳米PtRuP_2的纳米复合材料的性能与市售Pt / Ru /碳纳米复合材料一样,在直接甲醇燃料电池中具有阳极催化剂的作用。尽管通过消除所有磷源可以最好地实现Pt-Ru纳米复合材料中金属磷化物相的排除,但通过消除所有磷源可以最佳地实现Pt-Ru纳米复合物合成的存在,但在此类纳米复合物中PtRuP_2的存在并非如此毒甲醇电氧化。建议研究纯PtRuE_x(其中E表示主族杂元素)相的合成和电催化反应性。

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