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.

在化学系化学测量和成像项目的支持下，匹兹堡大学雨宫茂教授和他的团队正在开发新的电化学方法，可以识别反应中间体和氢电催化的可能反应途径。该项目的重点是获得对氢电催化的深入了解，这对于可持续和清洁氢燃料的高效生产和利用以及电化学科学技术的许多重要领域至关重要。迫切需要可靠地识别氢电催化的分子机制，不仅可以了解铂族金属的优异电催化活性，而且还可以设计基于廉价且地球丰富的元素的替代性优质电催化剂。来自代表性不足群体的学生将通过参与为拟议研究开发先进电化学仪器以及为本科实验室实施复杂的电催化计算模拟来体验跨学科培训。该项目专注于氢析出和氢析出的定量研究。氧化反应来解决这些两步双电子反应的混合途径。雨宫实验室正在开发的新纳米电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特性提供机会。具体来说，Amemiya教授和他的研究小组正在开发和应用基于扫描电化学显微镜的瞬态纳米间隙伏安法，以分别确定每个电子转移和吸附步骤的热力学和动力学参数。通过使用表面原子排列明确的清洁单晶金属可以获得可靠的反应参数。将根据弱吸附金属和强吸附金属的每个相关反应的实验确定参数建立火山图，并将为改进电催化剂的合理设计提供有价值的指导。该奖项反映了 NSF 的法定使命，并被认为值得支持通过使用基金会的智力优点和更广泛的影响审查标准进行评估。