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首页> 外文期刊>RSC Advances >Improving the catalytic activity of Au/Pd core-shell nanoparticles with a tailored Pd structure for formic acid oxidation reaction
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Improving the catalytic activity of Au/Pd core-shell nanoparticles with a tailored Pd structure for formic acid oxidation reaction

机译：用甲酸氧化反应的定制Pd结构改善Au / Pd核壳纳米粒子的催化活性

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摘要

Unique morphology-tunable Au/Pd core-shell nanoparticles were synthesized by galvanic replacement of preformed Cu on hollow Au cores using different PdCl2 concentrations. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and electrochemical analysis. The results showed that the structure of the nanocrystalline Pd on the hollow Au core surface was strongly dependent on the PdCl2 concentration. It was found that Pd2+ ions transport and react in the porous Cu layer, helping to create a continuous but porous structure which enlarges the Pd surface area and increases the electrochemical activity. In addition, the Au/Pd core-shell nanoparticles displayed superior electrochemical performance and stability in formic acid oxidation than commercial Pd black, especially for the ones synthesized using 2.5 mM PdCl2. The enhanced electrocatalytic performance may be attributed to the optimum electronic coupling effect caused by the interaction between the specific Pd structure and the hollow Au core.
机译：通过不同的PdCl2浓度在空心Au芯上的预成型Cu的电常用替代，合成独特的形态学可调Au / Pd核 - 壳纳米颗粒。通过X射线衍射（XRD），透射电子显微镜（TEM），X射线光电子能谱（XPS）和电化学分析，表征纳米颗粒。结果表明，中空Au芯表面上的纳米晶体Pd的结构强烈取决于PdCl2浓度。发现PD2 +离子输送并在多孔Cu层中反应，有助于产生连续但多孔结构，该结构扩大Pd表面积并增加电化学活性。此外，Au / Pd核 - 壳纳米颗粒在甲酸氧化中显示出优异的电化学性能和富含商业PD黑色的稳定性，特别是对于使用2.5mM PdCl2合成的甲酸氧化稳定性。增强的电催化性能可能归因于由特定PD结构与空心Au芯之间的相互作用引起的最佳电子耦合效果。

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  • 来源
    《RSC Advances》 |2016年第29期|共6页
  • 作者

    Hsu Chiajen; Wei Mingsheng; Wei Zi; Liu Fuqiang;

  • 作者单位

    Univ Texas Arlington Dept Mat Sci &

    Engn Electrochem Energy Lab 501 West First St Room 231 Arlington TX 76019 USA;

    Jiangsu Normal Univ Sch Phys &

    Elect Engn Xuzhou 221116 Peoples R China;

    Univ Texas Arlington Dept Mat Sci &

    Engn Electrochem Energy Lab 501 West First St Room 231 Arlington TX 76019 USA;

    Univ Texas Arlington Dept Mat Sci &

    Engn Electrochem Energy Lab 501 West First St Room 231 Arlington TX 76019 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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