Potential-induced stress in the solid-liquid interface: Au(111) and Au(100) in an HClO4 electrolyte
Potential-induced stress in the solid-liquid interface: Au(111) and Au(100) in an HClO4 electrolyte
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DOI：
10.1016/s0039-6028(96)01252-6
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发表时间：
1997-03-20
期刊：
影响因子：
1.9
通讯作者：
Grossmann, A
中科院分区：
文献类型：
--
作者：
Ibach, H;Bach, CE;Grossmann, A
采用悬臂弯曲法测定了0.1M HClO4中Au（111）和Au（100）的电位诱导界面应力。用电化学STM观察了晶体板的弯曲。通过对弯曲弹性理论的重新考虑，表明包括液体部分在内的整个界面对测量应力有贡献。在测量界面应力的同时，利用STM观察了两个表面重建的电位引起的提升。利用在- 140和960 mV与SCE之间循环电位后表面仍处于未重建状态的事实，可以独立确定与表面重建和ClO4-离子的特异性吸附相关的应力。特定吸附引起的应力在大小上与真空中表面吸附引起的应力相当。在重建理论模型的背景下，讨论了与重建相关的表面应力变化。结果支持应力是Au（111）上重构的驱动力，而Au（100）上与重构相关的应力松弛不是迫使表面进入重构状态的足够能量来源的观点。(C) 1997爱思唯尔科学有限公司
The cantilever bending method is applied to the determination of the potential-induced interface stress for Au(111) and Au(100) in 0.1M HClO4. The bending of the crystal plates was observed using an electrochemical STM. By a reconsideration of the elasticity theory of bending, it is shown that the entire interface including the liquid part contributes to the measured stress. The potential-induced lifting of the reconstruction of the two surfaces was observed using the STM simultaneously with the measurement of the interface stress. By making use of the fact that after cycling the potential between - 140 and 960 mV versus SCE the surfaces remain in an unreconstructed state, one can determine independently the stresses which are associated with the surface reconstruction and with the specific adsorption of ClO4- ions. The stress induced by the specific adsorption is comparable in size to the adsorption-induced stress for surfaces in vacuum. The reconstruction-related changes in the surface stress are discusssed in the context of theoretical models for the reconstruction. The results support the notion that the stress is the driving force for the reconstruction on Au(111), whereas on Au(100) stress relaxation associated with the reconstruction is not a sufficient source of energy to force the surface into the reconstructed state. (C) 1997 Elsevier Science B.V.