SusChEM: Photochemically-Induced Nucleation and Growth of Manganese Oxides at Environmental Interfaces

SusChEM：环境界面处锰氧化物的光化学诱导成核和生长

• 批准号: 1610728
• 负责人: Young-Shin Jun
• 金额: $ 40.29万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1610728&HistoricalAwards=false
• 关键词: SusChEM; Photochemically; Induced; Nucleation; Growth

In this project funded by the Environmental Chemical Science Program in the Chemistry Division at the National Science Foundation, Professor Young-Shin Jun of Washington University in St. Louis examines changes in manganese compounds on exposure to the environment. The natural abundance of manganese is a primary motivation for studying its roles in natural and man-made environmental processes. Many manganese-contaminated lands result from human activities (e. g., acid mine drainage and contamination from urban atmospheres). Understanding the changes in various manganese-containing species on exposure to the environment is crucial to controlling manganese concentrations in drinking water. With support from Washington University's Institute for School Partnership (ISP), Professor Jun develops an "Environmental Chemistry and Energy" themed lecture series, with experimental chemistry and computer modeling experiments. Professor Jun's research findings are incorporated into university courses in Environmental Nanochemistry and Aquatic Chemistry. These educational activities provide development opportunities for undergraduate and graduate students. The educational activities are evaluated periodically by faculty from the ISP.The rich redox reactivity of manganese is of interest in engineered systems, such as in batteries and catalyzed water oxidation. This project provides fundamental thermodynamic and kinetic information about manganese (Mn) oxidation and subsequent manganese oxide (delta-MnO2) nanosheet nucleation and growth. The research project utilizes multidisciplinary tools to investigate the early stages of delta MnO2 nanosheet nucleation and in situ growth at the molecular scale. Small angle x-ray scattering (SAXS) / grazing incidence SAXS provides real-time information. Changes in mineral phases and mineral morphologies are studied with various X-ray techniques and electron microscopies. Fluid chemistry and electrochemical measurements are also be made. Furthermore, the synthesized delta-MnO2 is tested for its applications as an effective, environmentally-abundant cathode in a lithium-ion battery. This project provides useful information for developing sustainable energy materials.

在这个由国家科学基金会化学部环境化学科学计划资助的项目中，圣路易斯华盛顿大学的Young-Shin Jun教授研究了锰化合物在暴露于环境的情况下的变化。 天然丰富的锰是研究其在自然和人造环境过程中角色的主要动机。 许多锰污染的土地是由人类活动造成的（例如，酸性矿山排水和城市气氛的污染）。 了解含锰的各种物种在暴露于环境的情况下的变化对于控制饮用水中的锰浓度至关重要。 在华盛顿大学学校合作伙伴研究所（ISP）的支持下，Jun教授开发了一个“环境化学和能源”主题讲座系列，并通过实验化学和计算机建模实验。 Jun教授的研究结果纳入了大学环境纳米化学和水生化学课程中。这些教育活动为本科生和研究生提供了发展机会。教师从ISP定期评估教育活动。锰的丰富氧化还原反应性在工程系统中感兴趣，例如电池和催化的水氧化。该项目提供了有关锰（MN）氧化以及随后的氧化锰（Delta-MNO2）纳米片成核和生长的基本热力学和动力学信息。该研究项目利用多学科工具来研究Delta MNO2纳米片成核的早期阶段，并在分子尺度上进行原位生长。小角度X射线散射（SAX） /放牧发动机SAXS提供实时信息。通过各种X射线技术和电子显微镜研究了矿物相和矿物形态的变化。还进行了流体化学和电化学测量。此外，合成的Delta-MNO2因其在锂离子电池中的有效，环保的阴极而被测试。该项目为开发可持续能源材料提供了有用的信息。