The effective pH at the solid-liquid interface and the local ion distribution during complex electrochemical reactions

复杂电化学反应过程中固液界面的有效pH值和局部离子分布

• 批准号: 246217805
• 负责人: Professor Dr. Karl Mayrhofer
• 金额: --
• 依托单位: Abteilung RU-B: Electrocatalysis
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246217805?language=en
• 关键词: effective; pH; solid; liquid; interface

Heterogeneous catalytic reactions in un- or only weakly buffered, neutral media, which are typical conditions for natural environments, are often dominated by the pH value directly at the liquid/solid interface. Although this is highly important and well-known for several research studies in various fields related to surface and interface chemistry, the effect of the interface pH and its complex relation to reaction rates of pH dependent reactions, mass transport of educts and products, and bulk pH value can only be determined quantitatively for very facile systems. In this project the effect of the interface pH and the whole ion distribution close to the electrode surface will be investigated on a fundamental level, in order to derive an improved understanding and a general model for heterogeneous reactions in neutral media. The experimental investigations are based on special ion-selective, local methods, which are applied initially for facile reactions on ideal systems and later for kinetically constrained reactions like the electrochemical oxygen reduction even on inhomogeneous, realistic surfaces. The understanding of the complex relationships that affect the interface pH will be finally utilized for the improvement of applications in corrosion protection and related topics.

在非缓冲或仅弱缓冲的中性介质中的非均相催化反应（其是自然环境的典型条件）通常由直接在液/固界面处的pH值主导。虽然这是非常重要的和众所周知的几个研究在各个领域有关的表面和界面化学，界面pH值的影响和它的复杂关系的反应速率的pH值依赖的反应，质量运输的离析物和产品，和散装pH值只能定量确定非常容易的系统。在这个项目中，界面pH值和整个离子分布接近电极表面的影响将在一个基本的水平上进行研究，以获得一个更好的理解和中性介质中的非均相反应的一般模型。实验研究是基于特殊的离子选择性，本地的方法，这是适用于最初的理想系统上的简易反应，后来的动力学约束的反应，如电化学氧还原，即使在不均匀的，现实的表面。对影响界面pH值的复杂关系的理解最终将用于改进腐蚀防护和相关主题的应用。

项目成果

Oxygen and hydrogen evolution reactions on Ru, RuO2, Ir, and IrO2 thin film electrodes in acidic and alkaline electrolytes: A comparative study on activity and stability

• DOI: 10.1016/j.cattod.2015.08.014
• 发表时间: 2016-03-15
• 期刊: CATALYSIS TODAY
• 影响因子: 5.3
• 作者: Cherevko, Serhiy;Geiger, Simon;Mayrhofer, Karl J. J.
• 通讯作者: Mayrhofer, Karl J. J.

Numerical Simulation of an Electrochemical Flow Cell with V-Shape Channel Geometry

• DOI: 10.1149/2.0261512jes
• 发表时间: 2015-01-01
• 期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
• 影响因子: 3.9
• 作者: Kulyk, Nadiia;Cherevko, Serhiy;Mayrhofer, Karl J. J.
• 通讯作者: Mayrhofer, Karl J. J.

Effect of hydrogen carbonate and chloride on zinc corrosion investigated by a scanning flow cell system

• DOI: 10.1016/j.electacta.2015.01.217
• 发表时间: 2015-03-20
• 期刊: ELECTROCHIMICA ACTA
• 影响因子: 6.6
• 作者: Laska, Claudius A.;Auinger, Michael;Mayrhofer, Karl J. J.
• 通讯作者: Mayrhofer, Karl J. J.

Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction

• DOI: 10.1149/2.0181611jes
• 发表时间: 2016-01-01
• 期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
• 影响因子: 3.9
• 作者: Geiger, Simon;Kasian, Olga;Cherevko, Serhiy
• 通讯作者: Cherevko, Serhiy