GOALI: Probing Temporospatial Correlations at the Nanoscale in High-Temperature Electrocatalysts

GOALI：探测高温电催化剂纳米尺度的时空相关性

• 批准号: 1435968
• 负责人: Stuart Adler
• 金额: $ 45万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1435968&HistoricalAwards=false
• 关键词: GOALI; Probing; Temporospatial; Correlations; Nanoscale

Abstract Title: GOALI: New Scanning Probe Methods for Imaging Local Activity in Electrocatalysts on Nanometer Length ScalesA key requirement for our nation's future energy infrastructure is an ability to efficiently interconvert chemical (fuel) and electrical forms of energy. Such interconversion is facilitated by using oxide electrocatalysts at high temperature, which provide highly active surfaces upon which molecules and electrons can interact. Unfortunately the factors governing activity and degradation of electrocatalysts are not very well understood. This project seeks to develop new scanning probe methods that can image in real time, and during operation at up to 500-600°C, where and when reactions occur on the surface, with nanometer resolution. This GOALI award brings together Professors Stuart Adler and Jiangyu Li with expertise in electrocatalysis and scanning probe methods at the University of Washington and Dr. Roger Proksch, head of the research staff at Asylum Research, a leading developer of scanning probe instruments to develop an advanced high-temperature scanning probe system. This instrument and the resulting research work will lead to major advances in how we study electrocatalysts, as well as provide key insights leading to new technological advances in electrocatalysis. The project will also provide advanced graduate education to two PhD students, provide research opportunities for undergraduates, and support the mentorship of Seattle-area K-12 students in pursuing a deeper scientific education. A universal challenge facing development of high temperature electrocatalysts is a lack of fundamental understanding of physical and chemical rates at local length scales (10-50 nm). A growing body of research shows that the composition, structure, and properties of these materials near solid-solid or gas-solid interfaces deviate substantially from the bulk. The purpose of this GOALI is to develop scanning probe techniques (based on measurement of local lattice strain, conductivity, and surface work function) to quantify and image local rates in porous high-temperature electrocatalysts under in-situ conditions. This project seeks to 1) link strain, work function, and other locally measurable properties to variations in charged defect concentrations, 2) implement scanning probe techniques in-situ on working electrodes as witnesses of local dynamics, and 3) extend the current experimental capabilities to access higher temperatures (500-600°C). Ultimately, the active region of a porous electrode will be imaged as a function of variables, resulting in the extraction of basic information about relative rates of molecular reactions, surface transport, and bulk transport occurring at a local level near the electrode/electrolyte interface.

摘要标题：目标：纳米尺度电催化剂局部活性成像的新扫描探针方法我国未来能源基础设施的一个关键要求是能够有效地相互转换化学（燃料）和电能形式。 通过在高温下使用氧化物电催化剂来促进这种相互转化，氧化物电催化剂提供分子和电子可以在其上相互作用的高活性表面。 不幸的是，控制电催化剂的活性和降解的因素还不是很清楚。 该项目旨在开发新的扫描探针方法，可以在真实的时间成像，并在高达500-600°C的操作过程中，在哪里和何时在表面上发生反应，具有纳米分辨率。 这个GOALI奖项汇集了华盛顿大学在电催化和扫描探针方法方面具有专业知识的Stuart Adler教授和Jiangyu Li教授以及Asylum Research研究人员负责人Roger Proksch博士，Asylum Research是扫描探针仪器的领先开发商，旨在开发先进的高温扫描探针系统。这种仪器和由此产生的研究工作将导致我们如何研究电催化剂的重大进展，并提供关键的见解，导致电催化的新技术进步。 该项目还将为两名博士生提供高级研究生教育，为本科生提供研究机会，并支持西雅图地区K-12学生的导师，以追求更深入的科学教育。高温电催化剂的开发所面临的普遍挑战是缺乏对局部长度尺度（10-50 nm）下的物理和化学速率的基本理解。 越来越多的研究表明，这些材料在固-固或气-固界面附近的组成、结构和性质与本体材料有很大的不同。 该GOALI的目的是开发扫描探针技术（基于局部晶格应变，电导率和表面功函数的测量），以量化和成像多孔高温电催化剂在原位条件下的局部速率。 该项目旨在1）将应变，功函数和其他局部可测量的属性与带电缺陷浓度的变化联系起来，2）在工作电极上原位实施扫描探针技术作为局部动态的见证，以及3）扩展当前的实验能力以获得更高的温度（500-600°C）。最终，多孔电极的活性区域将被成像为变量的函数，从而提取关于在电极/电解质界面附近的局部水平发生的分子反应、表面传输和本体传输的相对速率的基本信息。