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首页> 外文期刊>RSC Advances >Epitaxial growth of Pd nanoparticles on molybdenum disulfide by sonochemistry and its effects on electrocatalysis
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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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In this work, we have synthesized Pd/MoS _(2) samples in which about 7 nm sized Pd NPs are formed on a MoS _(2) 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-MoS _(2) in ethylene glycol. Based on the structural characterization data, the Pd NPs are firstly grown epitaxially on the MoS _(2) surface in the [1?10] _(Pd) ||[100] _(MoS _(2) ) and (111) _(Pd) ||(001) _(MoS _(2) ) 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 MoS _(2) surface. The epitaxially grown Pd NPs experience a tensile strain and charge-transfer to MoS _(2) , 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 MoS _(2) can facilitate the ORR kinetics of Pd NPs. The observed ORR data on Pd/MoS _(2) can be explained as the net result of these two opposing effects of the MoS _(2) support.
机译：在这项工作中，我们具有合成的PD / MOS _（2）样品，其中在MOS _（2）表面上形成约7nm大小的Pd NP，PD含量从14.4wt％变化至33.6wt％，并研究了它们的电催化碱性介质中氧还原反应（ORR）的活性。通过在乙二醇中的乙酰丙酮酸钯和2H-MOS _（2）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 NPS首先在[1？10] _（PD）|| [100] _（MOS _（2））和（111）中在MOS _（2）表面上延伸在MOS _（2）表面上。（MOS _（2））和（111） _（pd）||（001）_（mos _（2））关系。随着PD含量的增加，PD NP形成在PD NP的第一层顶部以及可用的MOS _（2）表面上。外延生长的PD NPS体验拉伸应变和电荷转移到MOS _（2），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）对MOS _（2）的增强吸附可以促进PD NPS的ORR动力学。 PD / MOS _（2）上的观察到的ORR数据可以解释为MOS _（2）支持的这两个相反效果的净结果。

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