Size Dependence of Charge State of Pd Nanoparticles on the Al2O3/NiAl(110) Surface by Kelvin Probe Force Microscopy,The Journal of Physical Chemistry C

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Size Dependence of Charge State of Pd Nanoparticles on the Al2O3/NiAl(110) Surface by Kelvin Probe Force Microscopy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acs.jpcc.0c07488
Shanrong Zou ₁ , Hirotaka Yokoyama ₁ , Yasuhiro Sugawara ₁ , Yan Jun Li ₁

Affiliation

The charge state of palladium nanocatalysts can alter the catalytic conversion process and is required for understanding the important catalytic reactions in applications. However, the charge state of palladium nanoparticles (NPs) has not been understood yet completely. Here, we investigate the size dependence of the charge state of Pd NPs deposited on an Al₂O₃/NiAl(110) surface by noncontact atomic force microscopy and Kelvin probe force microscopy at room temperature. We found that Pd NPs adsorbed on the line defects on the surface were negatively charged and the charge state increased with the NP size. Furthermore, Pd NPs show a different size variation on two types of line defects. We consider the work function change affected by the charging behavior mainly according to the classical model for small metallic spheres. We demonstrate that the charge state variation of the adsorbed Pd NPs on the line defects was affected by its size change mainly, which results in the variation of charge state difference. Our results provide insights into the mechanisms of catalytic reactions.

中文翻译：

Kelvin探针力显微镜观察Pd纳米粒子在Al ₂ O ₃ / NiAl（110）表面上电荷态的大小依赖性

钯纳米催化剂的电荷状态可以改变催化转化过程，是理解应用中重要催化反应所必需的。但是，钯纳米粒子（NPs）的电荷状态尚未完全了解。在这里，我们研究沉积在Al ₂ O ₃上的Pd NPs电荷状态的大小依赖性/ NiAl（110）表面通过非接触原子力显微镜和开尔文探针力显微镜在室温下进行。我们发现，吸附在表面线缺陷上的Pd NPs带负电，并且电荷状态随NP尺寸的增加而增加。此外，Pd NP在两种类型的线缺陷上显示出不同的尺寸变化。我们主要根据小金属球的经典模型来考虑受充电行为影响的功函数变化。我们证明，在线缺陷上吸附的Pd NPs的电荷状态变化主要受其尺寸变化的影响，这导致电荷状态差异的变化。我们的结果提供了对催化反应机理的见解。

更新日期：2020-10-02

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