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Epitaxial growth of Pd nanoparticles on molybdenum disulfide by sonochemistry and its effects on electrocatalysis

机译:Sonochemisty钼钼酰纳米粒子的外延生长及其对电寄生分析的影响

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摘要

In this work, we have synthesized Pd/MoS2 samples in which about 7 nm sized Pd NPs are formed on a MoS2 surface with the Pd content varied from 14.4 wt% to 33.6 wt% and studied their electrocatalytic activity for oxygen reduction reaction (ORR) in an alkaline medium. The syntheses were achieved by single-step sonochemical reactions between palladium acetylacetonate and 2H-MoS2 in ethylene glycol. Based on the structural characterization data, the Pd NPs are firstly grown epitaxially on the MoS2 surface in the [1-10](Pd)parallel to[100](MoS2) and (111)(Pd)parallel to(001)(MoS2) relationship. As the Pd-content increases, Pd NPs are formed on top of the first layer of Pd NPs as well as on the available MoS2 surface. The epitaxially grown Pd NPs experience a tensile strain and charge-transfer to MoS2, which raises the d-band center of Pd, lowering the on-set potential in ORR. On the other hand, the enhanced adsorption of O-2 on MoS2 can facilitate the ORR kinetics of Pd NPs. The observed ORR data on Pd/MoS2 can be explained as the net result of these two opposing effects of the MoS2 support.
机译:在这项工作中,我们具有合成的Pd / MOS2样品,其中在MOS2表面上形成约7nm大小的Pd NP,PD含量从14.4wt%变化至33.6wt%,并研究了它们的氧还原反应的电催化活性(ORR)在碱性培养基中。通过在乙二醇钯之间的单步交学反应和乙二醇中的2H-MOS2之间的单步交学化学反应来实现合成。基于结构表征数据,PD NP首先在[1-10](PD)中并联至(MOS2)和(111)(PD)平行于(001)(MOS2)(MOS2)在[1-10](Pd)中的MOS2表面上延伸) 关系。随着PD含量的增加,PD NP形成在PD NPS的第一层顶部以及可用的MOS2表面上。外延生长的PD NPS经验拉伸应变和电荷转移到MOS2,其升高了PD的D波段中心,降低了ORR中的开启电位。另一方面,O-2在MOS2上的增强吸附可以促进PD NPS的ORR动力学。可以解释PD / MOS2上的观察到的ORR数据作为MOS2支撑件的这两个相对效果的净结果。

著录项

  • 来源
    《RSC Advances》 |2016年第53期|共6页
  • 作者

    Lee Eunjik; Kwon Young-Uk;

  • 作者单位

    Sungkyunkwan Univ SKKU Adv Inst Nanotechnol Suwon 440746 South Korea;

    Sungkyunkwan Univ SKKU Adv Inst Nanotechnol Suwon 440746 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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