Instrument Development: Creating a Tunable, Broad bandwidth 2D IR Microscope for Quantitative Imaging of Chemical Dynamics Near Reactive Surfaces

仪器开发：创建可调谐、宽带 2D 红外显微镜，用于对反应表面附近的化学动力学进行定量成像

• 批准号: 2108346
• 负责人: Amber Krummel
• 金额: $ 51.02万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108346&HistoricalAwards=false
• 关键词: Instrument; Development; Creating; Tunable; Broad

With the support of the Chemical Measurement and Imaging (CMI) Program in the Division of Chemistry, Amber Krummel of Colorado State University will study the structures and motions of molecules near electrode surfaces. A major goal is to produce molecular snapshots during the formation and growth of the solid electrolyte interphase (SEI) in a model electrochemical cell. The electrolytes and electrodes used in this project will be chosen to closely model organic battery electrolytes and half-cells contributing to emerging energy storage technologies. Dr. Krummel and her group will be building new capabilities into an emerging imaging technique— 2-dimensional infrared (2D-IR) microscopy. 2D-IR microscopy holds the promise of visualizing the "molecular dance" taking place near electrode surfaces, due to its ability to provide chemical information at ultrafast time scales and its sensitivity to different types of molecular structures. The efforts supported by this funding will produce new chemical imaging tools crucial to many disciplines of science and technology, such as electrochemical processes associated with clean energy technologies, materials science, biotechnology, and geology. The results of the imaging experiments are expected to provide insights into the fundamental characteristics of SEI, which is key for understanding device performance issues encountered in energy storage technologies. Further broadening impacts of the project are Dr. Krummel is helping to train the next generation of spectroscopists and microscopists in the areas of physical chemistry, laser physics, and materials chemistry. The primary goal of building a tunable, broad bandwidth 2D-IR microscope will require integration of knowledge in optical physics, imaging, and ultrafast nonlinear optical spectroscopy tools. Finally, through hands-on mentoring, the researchers in the Krummel group will learn the art of communicating their innovations to broad audiences and principles of community through direct training in diversity, equity, inclusion, and social justice issues within their communities.Developing an imaging modality capable of reporting chemical dynamics at ultrashort timescales and then connecting the observed dynamics to macroscopic observables is extremely attractive. Two-dimensional infrared (2D-IR) spectroscopy is a proven tool for capturing information on chemical structures and dynamics at femtosecond timescales and longer, which limits its recording chemical information about reactions that are extremely fast and key to many crucial chemical processes. This project is expected to significantly reduce the acquisition time of 2D IR spectra, thus making it possible to develop new 2D-IR imaging tools to directly measure molecular interactions across multiple length scales. The scientific inquiry outlined in this project aims to create a new nonlinear optical microscopy tool capable of mapping chemical interactions. The chemical interactions that will be mapped are expected to contain quantitative details of dynamic behaviors in electrolytes near electrode surfaces. The research team will initiate in situ imaging of molecular structures and dynamics during solid electrolyte interphase formation for the first time. These experimentshave to potential to increase knowledge of fundamental driving forces present during SEI formation at electrode surfaces, providing crucial control parameters of the SEI, as well as demonstrating the utility of 2D-IR imaging across a range of scientific disciplines.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.

在化学系化学测量与成像（CMI）项目的支持下，科罗拉多州立大学的Amber Krummel将研究电极表面附近分子的结构和运动。一个主要的目标是在模型电化学电池的固体电解质间相（SEI）的形成和生长过程中产生分子快照。该项目中使用的电解质和电极将被选择来密切模拟有机电池电解质和半电池，为新兴的储能技术做出贡献。克鲁梅尔博士和她的团队将为一种新兴的成像技术——二维红外（2D-IR）显微镜——建立新的能力。由于2D-IR显微镜能够在超快的时间尺度上提供化学信息，并且对不同类型的分子结构具有敏感性，因此它有望可视化发生在电极表面附近的“分子舞蹈”。该基金支持的努力将产生对许多科学和技术学科至关重要的新型化学成像工具，例如与清洁能源技术、材料科学、生物技术和地质学相关的电化学过程。成像实验的结果有望提供对SEI基本特征的见解，这是理解储能技术中遇到的设备性能问题的关键。进一步扩大该项目的影响是，克鲁梅尔博士正在帮助培养物理化学、激光物理和材料化学领域的下一代光谱学家和显微镜学家。构建可调谐的宽带2D-IR显微镜的主要目标将需要集成光学物理，成像和超快非线性光学光谱工具方面的知识。最后，通过实践指导，克鲁梅尔小组的研究人员将通过在社区内进行多样性、公平、包容和社会正义问题的直接培训，学习将他们的创新成果传达给广大受众的艺术和社区原则。开发一种成像模式，能够在超短时间尺度上报告化学动力学，然后将观察到的动力学与宏观可观察到的结果联系起来，这是非常有吸引力的。二维红外（2D-IR）光谱学是一种经过验证的工具，用于在飞秒或更长时间尺度上捕获化学结构和动力学信息，这限制了它记录有关极快反应的化学信息，并对许多关键化学过程至关重要。该项目有望显著缩短二维红外光谱的采集时间，从而使开发新的二维红外成像工具成为可能，从而直接测量跨多个长度尺度的分子相互作用。在这个项目中概述的科学探究旨在创建一种新的非线性光学显微镜工具，能够绘制化学相互作用。将被绘制的化学相互作用预计将包含电极表面附近电解质动态行为的定量细节。研究小组将首次在固态电解质间相形成过程中进行分子结构和动力学的原位成像。这些实验有可能增加对电极表面SEI形成过程中存在的基本驱动力的了解，提供SEI的关键控制参数，并展示2D-IR成像在一系列科学学科中的实用性。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。