Model-based Analysis of Oxygen and CO2 Reduction Reaction Kinetics on Silver Electrodes

基于模型的银电极上氧气和二氧化碳还原反应动力学分析

• 批准号: 316985431
• 负责人: Professorin Dr.-Ing. Tanja Vidakovic-Koch
• 金额: --
• 依托单位: Fachgruppe Elektrochemische Energieumwandlung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316985431?language=en
• 关键词: Model; based; Analysis; Oxygen; CO2

In this project kinetics of oxygen (ORR) and carbon dioxide reduction (CO2R) on polycrystalline silver electrodes are studied. The aim is to improve the basic understanding of the kinetics of electrochemical reactions under atypical conditions, e.g. in highly concentrated solutions (ORR) and in presence of side reactions (CO2R). In addition, the results of this project will be used to understand the limitations of ORR and CO2R in technical gas diffusion electrodes. The method of choice to study this processes is nonlinear frequency response analysis (NFRA). Having in mind high interest of scientific community in nonlinear dynamic methods, another objective of this project is to further develop NFRA method. This will be possible through the systematic investigation of various electrochemical reactions on a silver electrode (ORR, HER, CO2R), which cover a wide range of complex electrochemical reaction mechanisms (with electrochemical, chemical steps and previous reactions in electrolytes). The ORR and CO2R reactions include the formation of intermediate (hydrogen peroxide) or by-products (H2) which reduce selectivity compared to the desired product (OH and CO for ORR or CO2R respectively). Therefore it is interesting to demonstrate whether periodic operation can influence product selectivity for CO2R, which is not only of practical but also of fundamental importance.

在此项目中，研究了多晶银电极上氧（ORR）和二氧化碳还原（CO2R）的动力学。目的是提高对非典型条件下电化学反应动力学的基本理解，例如在高度浓缩的溶液（ORR）中，并存在侧面反应（CO2R）。此外，该项目的结果将用于了解技术气体扩散电极中ORR和CO2R的局限性。研究此过程的选择方法是非线性频率响应分析（NFRA）。考虑到科学界在非线性动态方法中的高度兴趣，该项目的另一个目标是进一步开发NFRA方法。通过对银电极（ORR，HER，CO2R）进行各种电化学反应的系统研究，这将是可能的，该反应涵盖了广泛的复杂电化学反应机制（具有电化学，化学步骤和电解质中的先前反应）。 ORR和CO2R反应包括与所需产品相比（分别为ORR或CO2R的OH和CO）的中间体（过氧化氢）或副产品（H2）的形成。因此，有趣的是证明定期操作是否可以影响CO2R的产品选择性，这不仅是实际的，而且具有根本重要性。