Masahiro Seo - Electro-Chemo-Mechanical Properties of Solid Electrode Surfaces

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Surface stress is the mechanical work unique for a solid surface which is elastically deformed due to low mobility of the component atoms. When the potential is applied to a solid metal electrode in electrolyte solution, the surface stress of the solid electrode changes depending on the applied potential due to the electrochemical reaction taking place on the electrode such as electro-sorption or electro-deposition. Reversely, when a solid metal electrode is elastically strained, the potential of the electrode varies depending on the degree of the surface strain. In addition, when a surface oxide film (anodic oxide film) is formed and grown on a solid metal electrode during anodic oxidation, stress is generated in the film and the film stress varies depending on the conditions of anodic oxidation. The properties of solid electrode surfaces associated with the correlation between electrochemical and mechanical phenomena are named electro-chemo-mechanical properties.

This book deals with the electro-chemo-mechanical properties of solid electrode surfaces that are useful for a deep insight into the interfacial phenomena such as electro-catalytic reaction, surface film formation and corrosion. This text is aimed at graduates and senior undergraduates studying interfacial electrochemistry and materials science or those beginning research work in the fields and related areas.

In Chap..

In Chap. , the controversial arguments made so far for surface thermodynamics of a solid electrode are reviewed to find a clue for solving the thermodynamic issues.

Stresses generated in anodic oxide films on a solid metal electrode are influenced by many factors associated with the film formation and growth mechanism. In Chap..

I would like to acknowledge the colleagues of Corrosion Research Group at Hokkaido University who gave me a strong motivation for the preparation of this book. I wish to thank postdoctoral and graduate students studied in my laboratory for their contribution to this book. Finally, I am grateful to my wife, Hiroko, for her constant support.

Surface thermodynamics is fundamentals for understanding of the electro-chemo-mechanical properties of solid electrode surfaces. This chapter deals with surface thermodynamics of a solid electrode. In the interface region of two phases, the properties vary between those of bulk phase. Surface thermodynamics treats the interface region of two phases as one phase, i.e., surface phase (or interphase). At first, the explanation for the concept of a surface phase (or interphase) has to precede the derivation of the general equations of surface thermodynamics. Surface stress is the most important thermodynamic parameter to characterize a solid electrode since the changes in surface stress are directly associated with the electro-chemo-mechanical properties. The derivation of the relationship between surface stress and surface tension for a solid electrode is indispensable for distinguishing a solid electrode from a liquid electrode such as mercury electrode. The electrocapillary curve (surface stress vs. potential or surface tension vs. potential) derived for the electrified interface of a solid electrode is different from that (surface tension vs. potential) derived for the electrified interface of a liquid electrode. The comparison between the electrocapillary curves obtained experimentally for the electrified interfaces of gold (solid) and mercury (liquid) electrodes is necessitated to confirm the difference between electrocapillary curves derived thermodynamically for the electrified interfaces of solid and liquid electrodes.