Probing the Interfacial behavior of nanostructured electrocatalysts for environmentally relevant catalytic systems

探索环境相关催化系统纳米结构电催化剂的界面行为

• 批准号: RGPIN-2018-06602
• 负责人: Brisard, Gessie
• 金额: $ 1.75万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=679941
• 关键词: Probing; Interfacial; behavior; nanostructured; electrocatalysts

Development and viability of important renewable energy technologies are inextricably linked to the electrochemical performance of their related catalytical materials. The composition of an electrocatalyst's surface and its atomic structure have a crucial influence on its performance characteristics, i.e. its catalytic activity and reaction selectivity. The fundamental understanding of catalytic processes is as meaningful for society as the search for new materials necessary for the commercialization of electrochemical device as alternative energy systems. In both cases, electrochemistry continues to play a pivotal role. Of various catalytic processes examined on electroactive materials, carbon dioxide reduction reaction (CRR) is a relevant processes with environmental applications and can be excellent candidate to be used as model systems for testing new electrodes. The proposed research program is focus on initiating a study of the kinetics and mechanism of those redox processes at nanostructured alloys, modified surfaces and well-defined surfaces for the elucidation and the understanding of the interfacial and electrochemical phenomena involved in electrocatalytic processes (adsorption phenomena, electrodeposition and nucleation). We proposed to modify the surface state selectively to study its role in the nature of the reaction intermediates and products. By the proper choice of the nature and stoechiometry of the participant metal in the electrocatalysts, it is possible to design substrate with various adsorption capability, mobility and structural geometry to inhibit or control the side reactions and to enhance the process efficiency. The research program is focusing on the role of the “ensemble-effect” and the nature of the interface metal-electrolyte, namely for CRR and ORR, two relevant electrochemical reactions. New CO2 conversion systems will be explore with solvents such as room temperature ionic liquids as well as with conventional aqueous media. In order to understand the impact of surface modifications and surface structure on the electrochemical activity and selectivity of (in)organic molecules, the reaction mechanisms and products will be investigate using on-line Electrochemical Mass Spectrometry and Rotating ring-disk Electrodes as complementary techniques. In-situ X-ray Absorption Spectroscopy will also be explore as a powerful technique to study surfaces of the designed electrocatalysts . Technologically, this research aims to provide results that will, on the short or long term, leads towards a better fundamental understanding of bifunctionnality of active materials and, ultimately, should lead to improved electrocatalysts for energy conversion and environmental applications.***

重要的可再生能源技术的发展和可行性与其相关催化材料的电化学性能密不可分，电催化剂的表面组成及其原子结构对其性能特征（即催化活性和反应选择性）具有至关重要的影响。催化过程的研究对于社会来说与寻找电化学装置作为替代能源系统商业化所需的新材料一样有意义，在这两种情况下，电化学仍然发挥着关键作用。在电活性材料上检查的各种催化过程中，二氧化碳还原反应（CRR）是与环境应用相关的过程，可以作为测试新电极的模型系统的优秀候选者。纳米结构合金、改性表面和明确表面的氧化还原过程的动力学和机制，用于阐明和理解电催化过程中涉及的界面和电化学现象（吸附现象、电沉积和我们提出选择性地改变表面状态来研究其在反应中间体和产物的性质中的作用，通过正确选择电催化剂中参与者的性质和化学计量，可以设计具有各种吸附能力的基底。 、迁移率和结构几何形状来抑制或控制副反应并提高工艺效率该研究项目的重点是“整体效应”的作用和金属-电解质界面的性质。 CRR 和 ORR 这两个相关的电化学反应将使用室温离子液体等溶剂以及传统的水介质进行探索，以了解表面改性和表面结构对电化学活性和选择性的影响。有机分子的反应机理和产物将使用在线电化学质谱和旋转环盘电极作为补充技术进行研究，还将探索原位 X 射线吸收光谱。研究设计的电催化剂表面的强大技术从技术上讲，这项研究旨在提供短期或长期的结果，使人们更好地了解活性材料的双功能，并最终改进能源电催化剂。转换和环境应用。***