Adsorption of anions on Ag nanostructured electrodes on HOPG

ABSTRACT The structure and properties of the electrochemical interface result from the interactions that occur between the different components of an electrolytic solution and the metal electrode. In particular, the anion / metal interactions have been of great interest in recent years, mainly due to the development of new techniques that have allowed the study of in situ and ex situ tests of the characteristics of this chemical adsorption bond. Specifically adsorbed ions modify the charge distribution and the structure of the interface, affecting the processes that occur in this interface. Therefore the detailed knowledge of the anion / electrode interactions are extremely important, such as the electrochemical processes of corrosion, UPD and Electrocatalysis. This paper aims to analyze the tendency of synthesized nanostructured electrodes (Ag / HOPG) to adsorb anions, such as Cl- and Br-. The results indicate that the Ag nanostructures have the ability to adsorb anions, but the behavior is different from their monocrystals.摘要 电化学界面的结构与性质，源自电解液各组分与金属电极之间的相互作用。近年来，阴离子与金属的相互作用受到学界广泛关注，这主要得益于一系列新兴技术的发展，使得研究者得以开展该化学吸附键特性的原位与非原位测试研究。特异性吸附离子可改变界面的电荷分布与结构，进而影响界面内发生的各类过程。因此，深入明晰阴离子与电极间的相互作用，对于腐蚀、欠电位沉积（Underpotential Deposition，UPD）及电催化（Electrocatalysis）等电化学过程而言至关重要。本研究旨在分析合成的纳米结构电极（银/高定向热解石墨，Ag/HOPG）吸附氯离子（Cl⁻）与溴离子（Br⁻）等阴离子的趋势。研究结果表明，银纳米结构具备吸附阴离子的能力，但其行为与其单晶态存在显著差异。