能源材料中的界面与相

苏东研究员

中国科学院物理研究所

简介：苏东，中国科学院物理研究所杰出研究员、A01课题组组长、先进材料与结构分析中国科学院重点实验室主任。1998年在南京大学物理系获学士学位，2003年在南京大学物理系和中国科学院物理研究所电镜实验室(联合培养)获凝聚态物理专业博士学位。曾先后在瑞士和美国做博士后(2004-2008)。2008-2019年在美国布鲁克海文国家实验室先后任助理、副研究员、研究员和研究室主任(group leader)。2019年起加入中科院物理研究所先进材料与结构分析实验室。他在SCI杂志上发表400余篇文章，总引用率大于50000次，H因子~123。2019-2024年入选“科睿唯安"高被引科学家，并任《Renewables》杂志创刊主编，及《Journal of Energy Chemistry》、《Microstructures》、《Interdisciplinary Materials》、《Next Materials》、《电子显微学报》编委。研究兴趣是结合电镜、同步辐射等结构分析手段表征能源材料，探究二次电池电极材料的反应动力学和催化反应机理。

摘要：The physicochemical properties of transition metal oxides are determined by their phase structures, surface exposed atoms, morphology, and defects. Metal oxide catalysts usually undergo a series of activation and reaction processes in practical applications, which modulate their morphology and change their valence states and crystal phases. These structural variations alternate their properties significantly and have been believed to be a critical problem, e.g., in their catalytic applications. During reactions, metal oxides undergo either reduction or oxidation reactions depending on the ratio of reducing or oxidizing gases in the atmosphere. Although it is believed that in situ investigation of the reaction pathways is of importance to understand their intrinsic redox nature, as far as we know, the microstructural evolution during the redox of metal oxides is still not well understood.  We have studied the dynamic reaction behaviors of iron oxides via in situ transmission electron microscopy (TEM) with a Climate system from DENSsolutions. We have achieved atomic-scale resolution imaging to visualize the evolution of phase boundary and the competitive transitions between Fe3O4, FeO, and Fe in the nanoreactor. Thus we found the inhomogeneous reaction pathways which are strongly affected by the trace amount of oxygen or water vapor in catalytic reactions. Our results could provide new insights into the redox reaction mechanism of transition metal oxides, and help to understand the role of these oxides in catalytic reactions.

报告时间：2024年9月24日13:30

报告地点：能源基础楼201楼会议室