The adsorption of hydrogen on the surface of gold nanoparticles deposited on a graphite support was studied in the presence of an external electric field by means of scanning tunneling microscopy (STM) and spectroscopy (STS). Hydrogen was adsorbed from the gas phase onto the surface of gold nanoparticles synthesized by impregnation-precipitation method. During the adsorption process, the STM tip was removed from the surface of the sample so that the measurable tunneling current could not flow, and potential differences of various polarities were applied to the vacuum gap between the sample and the grounded tip. Thus, the system of the STM tip and sample surface formed an asymmetric capacitor inside which an inhomogeneous electric field existed. No hydrogen adsorption was observed in the case of a positive potential difference, while dissociative adsorption of hydrogen took place in the cases of zero and negative potential differences. The ability to control the adsorption process of hydrogen by means of a weak electric field was demonstrated.

中文翻译：

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电场阻止氢吸附在负载的金纳米颗粒上

通过扫描隧道显微镜 (STM) 和光谱学 (STS) 研究了在外部电场存在下沉积在石墨载体上的金纳米粒子表面上的氢吸附。氢气从气相吸附到通过浸渍沉淀法合成的金纳米粒子的表面。在吸附过程中，STM针尖从样品表面移开，使可测量的隧道电流无法流动，并在样品与接地针尖之间的真空间隙施加各种极性的电位差。因此，STM 尖端和样品表面的系统形成了一个不对称的电容器，其中存在不均匀的电场。在正电位差的情况下没有观察到氢吸附，而氢的解离吸附发生在零和负电位差的情况下。证明了通过弱电场控制氢吸附过程的能力。