Scanning Electrochemical Microscopy of Single-Crystal Hydrogen Electrocatalysis

单晶氢电催化的扫描电化学显微镜

• 批准号: 2304922
• 负责人: Shigeru Amemiya
• 金额: $ 48万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2304922&HistoricalAwards=false
• 关键词: Scanning; Electrochemical; Microscopy; Single; Crystal

With support from the Chemical Measurement and Imaging Program in the Division of Chemistry, Professor Shigeru Amemiya and his group at the University of Pittsburgh are developing new electrochemical methods that allow for the identification of reactive intermediates and likely reaction pathways for hydrogen electrocatalysis. This project focuses on gaining an advanced understanding of hydrogen electrocatalysis, which is crucial for the efficient production and utilization of sustainable and clean hydrogen fuel and also for many important fields of electrochemical science and technology. Reliable identification of the molecular mechanism of hydrogen electrocatalysis is urgently demanded not only to understand the superior electrocatalytic activity of platinum-group metals but also to design alternative superior electrocatalysts based on inexpensive and earth abundant elements. Students from underrepresented groups will experience interdisciplinary training by participating in the development of advanced electrochemical instruments for the proposed research and in the implementation of the sophisticated computational simulation of electrocatalysis for an undergraduate laboratory.This project is focused on the quantitative study of both hydrogen evolution and oxidation reactions for the resolution of the intermingled pathways of these two-step two-electron reactions. New nanoelectrochemical methods being developed in the Amemiya laboratory will provide an opportunity to measure the adsorption energy of hydrogen atoms as well as establish the electrochemical identity of surface intermediates. Specifically, Professor Amemiya and his research group are developing and applying transient nanogap voltammetry based on scanning electrochemical microscopy to separately determine the thermodynamic and kinetic parameters of each electron transfer and adsorption step. Reliable reaction parameters can be obtained by employing clean single crystal metals with a well defined arrangement of surface atoms. A volcano plot will be established from the experimentally determined parameters of each involved reaction at both weakly and strongly adsorbing metals and will serve as a valuable guide for the rational design of improved electrocatalysts.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学测量和成像计划的支持下，Shigeru Amemiya教授及其匹兹堡大学的小组正在开发新的电化学方法，允许鉴定反应性中间体以及可能的氢电催化反应途径。该项目着重于对氢电催化的深入了解，这对于可持续和清洁氢燃料的有效生产和利用以及电化学科学和技术的许多重要领域至关重要。迫切需要对氢电催化的分子机制的可靠鉴定不仅要了解铂类金属的上电催化活性，而且还要基于廉价和地球丰富的元素设计替代性的上型电催化剂。来自代表性不足的小组的学生将通过参与拟议研究的先进电化学工具的开发以及实施本科实验室的电催化的复杂计算模拟，以进行跨学科培训。该项目的重点是对液压进化和进化和进化和定量研究氧化反应，用于分辨这些两步双电子反应的相互连接途径的氧化反应。在Amemiya实验室开发的新纳米电解化学方法将为测量氢原子的吸附能以及建立表面中间体的电化学认同提供机会。具体而言，Amemiya教授及其研究小组正在基于扫描电化学显微镜的瞬时纳米型伏安法开发和应用瞬态纳米律，以分别确定每个电子传递和吸附步骤的热力学和动力学参数。可靠的反应参数可以通过使用具有明确定义的表面原子排列的清洁单晶金属来获得。从弱和强烈吸附金属的每个涉及反应的实验确定的参数中，将建立一个火山图，并将作为改进的电催化剂的合理设计的宝贵指南。这奖反映了NSF的法定任务，并被视为值得支持的支持。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。