Controlling oxygen electrocatalysis on model oxide surfaces using electrolyte design

使用电解质设计控制模型氧化物表面上的氧电催化

• 批准号: 397636017
• 负责人: Dr. Marcel Risch
• 金额: --
• 依托单位: Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/397636017?language=en
• 关键词: Controlling; oxygen; electrocatalysis; model; oxide

The oxygen evolution reaction (OER) is one of the most fundamental processes for energy storage both in nature and technology. The high overpotential of the OER is one of the grand challenges faced in oxygen electrocatalysis and significant improvement is key for sustainable production of renewable energy carriers in a future hydrogen economy. Virtually all previous studies of activity and mechanism focused on the composition and structure of the catalytic electrode, while this project focuses on the influence of the electrolyte to identify structure-activity relationships. It is expected that hydrogen bonding can lower the relative formation energies of intermediates and products, which will lead to a reduction of the high overpotential of the reaction. The strength of hydrogen bonding in ionic liquids can be tuned systematically, thereby making them ideal model electrolytes to derive novel descriptors of activity and product yield. Oxygen evolution in model electrolytes with defined amounts of water will be detected by differential electrochemical mass spectroscopy (DEMS), while peroxide species will be simultaneously measured using a channel electrode. The proposed approach is generalizable to other insufficiently understood multi-step reactions on electrocatalytic surfaces, which offers new avenues to understand mechanisms and active sites of electrocatalysis for optimizing their activity.

析氧反应(OER)是自然界和技术上最基本的储能过程之一。OER的高过电势是氧气电催化面临的重大挑战之一，而重大改进是未来氢经济中可再生能源载体可持续生产的关键。几乎所有以前的活性和机理研究都集中在催化电极的组成和结构上，而本项目关注的是电解液的影响，以确定结构-活性关系。预计氢键可以降低中间体和产物的相对生成能，从而降低反应的高过电势。离子液体中氢键的强度可以系统地调节，从而使它们成为理想的模型电解质，以获得新的活性和产物产率的描述符。用差示电化学质谱(DEM)检测具有一定水量的模型电解液中的放氧量，同时使用通道电极同时测量过氧化氢物种。该方法可推广到其他电催化表面的多步反应，为理解电催化的机理和活性中心，优化其活性提供了新的途径。