NSF-DFG Echem: Operando Electronic Structure Determination of Iron and its Time-Dependent Dynamics in FexNi100-x(OH)y Electrooxidation Catalysts

NSF-DFG Echem：FexNi100-x(OH)y 电氧化催化剂中铁的操作电子结构测定及其随时间变化的动力学

• 批准号: 2055245
• 负责人: Lauren Greenlee
• 金额: $ 38万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-15 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2055245&HistoricalAwards=false
• 关键词: NSF; DFG; Echem; Operando; Electronic

This project aims to identify the structure of iron within iron-nickel hydroxide catalyst materials. These materials are highly active electrocatalysts for key reactions important to next-generation energy conversion and storage, including water electrolysis to produce hydrogen and battery electrodes. Understanding the chemistry of the iron species underpins the overall goal of designing and synthesizing non-precious metal electrocatalysts to support our future energy economy. These electrocatalyst materials will also likely play a role in other future electrochemical technologies, including chemical conversion and upcycling, biomass conversion, water treatment, and resource recovery. As such, this project, and its pursuit of understanding how iron structure changes in the electrochemical environment, is critical to support national energy security, as well as to advance society toward clean energy technologies. Discoveries made will support a wide range of research activities focused on similar non-precious metal oxides and hydroxides, advancing not only the science of iron-nickel hydroxides but of other similar materials and of synchrotron-based spectroscopy techniques aimed at probing catalyst materials in their operating environments. This U.S.-German collaboration will also strengthen international scientific relationships and contribute to the development of a diverse, globally competitive science and engineering workforce.The overarching research goal of this proposal is to experimentally probe Fe electronic structure under alkaline electrooxidation conditions by combining materials expertise with the x-ray spectroscopy instrumentation and expertise. Collaboratively conducted operando experiments will allow the team to unequivocally describe electronic state(s) of Fe and to understand the time dependency and hysteresis of Fe structural changes in FexNi100-x(OH)y nanocatalysts. The electrocatalytic reaction of focus will be the alkaline oxygen evolution reaction (OER). This project will further scientific understanding of the chemical and electronic structure of the active site for the OER in these catalysts, as well as advance fundamental understanding of Fe in the operando electrooxidative environment. The project will study a series of FexNi100-x(OH)y films and subsequently nanoparticle FexNi100-x(OH)y catalysts with soft x-ray absorption spectroscopy, x-ray emission spectroscopy, and resonant inelastic x-ray scattering. The project will focus on the iron L-edge and the oxygen K-edge of selected materials, and will include development of an operando cell for spectroscopy experiments, as well as detailed electrochemical analysis and in vacuo characterization of the catalyst materials.This project was awarded through the “NSF-DFG Lead Agency Activity in Electrosynthesis and Electrocatalysis (NSF-DFG EChem)" opportunity, a collaborative solicitation that involves the National Science Foundation and Deutsche Forschungsgemeinschaft (DFG).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.

该项目旨在用于进口产生能量转换和存储的关键反应的铁核氧化物材料，包括水电解以产生氢气和电池电极。电催化剂支持我们的未来经济。电化学。类似的材料和基于同步的光谱旨在探测其操作环境中的催化剂。光谱仪器和专业知识。 （OER）。 L边缘和所选材料的氧气，并将包括开发用于光谱实验的Operando细胞的详细电化学分析以及催化剂材料的真空表征。该项目是通过“ NSF-DFG铅在电气合成和电催化中的NSF-DFG铅活性（NSF-DFG echem）Ves Natsche Forschemeschaft（DFG）。该奖项反映了NSF'Sf'sfly的使命，并通过基金会的知识分子和更广泛的影响审查标准，通过评估来获得支持。