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：用于对纳米长度的电催化剂中局部活动成像的新扫描探针方法对我们国家未来能源基础设施的关键要求是有效互连化学（燃料）和电气形式的能力。通过在高温下使用氧化物电催化剂来支持这种互转换，后者提供了高度活性的表面，分子和电子可以相互作用。不幸的是，管理活性和电催化剂降解的因素并不十分了解。该项目旨在开发可以实时成像的新扫描探针方法，并在500-600°C的操作过程中，在地表上发生反应以及纳米分辨率的何处和时间。该目标奖将华盛顿大学的电催化和扫描探针方法的专业知识与扫描探测器的领先开发商的研究人员Roger Proksch博士一起，汇集了Stuart Adler和Jiangyu Li教授，并汇集了电催化和扫描探针方法的专业知识。该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主要进步，并提供关键见解，从而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，为大学生提供研究机会，并支持西雅图地区K-12学生的心态，以进行更深入的科学教育。高温电催化剂发展面临的普遍挑战是对局部长度尺度（10-50 nm）的物理和化学速率的基本了解。越来越多的研究表明，这些材料的组成，结构和性能在固体固体或气体固定接口附近，与整体差异很大。该目标的目的是开发扫描探针技术（基于对局部晶格菌株，电导率和表面工作功能的测量），以量化和图像在原位条件下多孔高温电催化剂中的局部速率。该项目寻求1）链接应变，工作功能和其他局部可测量的特性与电荷缺陷浓度的变化，2）在工作电极上实施扫描探针技术作为局部动力学的见证人，以及3）将当前的实验能力扩展到访问更高温度（500-600°C）（500-600°C）。最终，将对多孔电极的活性区域作为变量的函数成像，从而提取有关分子反应，表面传输和发生在电极/电解质界面附近的局部一级的基本信息的基本信息。