摘要翻译:
我们提出了一种新的基于循环伏安法的实验技术,它不仅可以区分吸附层中的不连续相变和连续相变,而且可以从连续相变体系的动力学分析中相当准确地恢复平衡行为。不连续相变(成核和生长)的电化学一级反转曲线(EC-FORC)图,如发生在欠电位沉积中,以负区域为特征,而连续相变,如发生在Ag(100)上的Br电吸附中,则不存在负区域。此外,对于连续相变的体系,即使在很高的扫描速率下,单个EC-FORC的极小值也会跟踪平衡曲线。由于EC-FORC方法只需对传统循环伏安法中使用的恒电位仪进行简单的重新编程即可获得实验数据,我们认为该方法对于电化学沉积体系的简单、快速、原位分析具有重要的潜力。
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英文标题:
《EC-FORC: A New Cyclic Voltammetry Based Method for Examining Phase
Transitions and Predicting Equilibrium》
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作者:
Ibrahim Abou Hamad, Daniel T. Robb, Mark A. Novotny, Per Arne Rikvold
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Chemical Physics 化学物理学
分类描述:Experimental, computational, and theoretical physics of atoms, molecules, and clusters - Classical and quantum description of states, processes, and dynamics; spectroscopy, electronic structure, conformations, reactions, interactions, and phases. Chemical thermodynamics. Disperse systems. High pressure chemistry. Solid state chemistry. Surface and interface chemistry.
原子、分子和团簇的实验、计算和理论物理-状态、过程和动力学的经典和量子描述;光谱学,电子结构,构象,反应,相互作用和相。化学热力学。分散系统。高压化学。固态化学。表面和界面化学。
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一级分类:Physics 物理学
二级分类:Materials Science 材料科学
分类描述:Techniques, synthesis, characterization, structure. Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术,合成,表征,结构。结构相变,力学性质,声子。缺陷,吸附质,界面
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
We propose a new, cyclic-voltammetry based experimental technique that can not only differentiate between discontinuous and continuous phase transitions in an adsorbate layer, but also quite accurately recover equilibrium behavior from dynamic analysis of systems with a continuous phase transition. The Electrochemical first-order reversal curve (EC-FORC) diagram for a discontinuous phase transition (nucleation and growth), such as occurs in underpotential deposition, is characterized by a negative region, while such a region does not exist for a continuous phase transition, such as occurs in the electrosorption of Br on Ag(100). Moreover, for systems with a continuous phase transition, the minima of the individual EC-FORCs trace the equilibrium curve, even at very high scan rates. Since obtaining experimental data for the EC-FORC method would require only a simple reprogramming of the potentiostat used in conventional cyclic-voltammetry experiments, we believe that this method has significant potential for easy, rapid, in-situ analysis of systems undergoing electrochemical deposition.
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PDF链接:
https://arxiv.org/pdf/706.1055


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