题目：Magnetization enhanced water oxidation on magnetic catalysts

（基于磁化增强磁性催化剂的水氧化反应）

报告人：徐梽川 教授，南洋理工大学

邀请人：梁振兴 教授

时间：2024年5月11日 10：00-11：00

地点：逸夫工程馆105会议室

欢迎广大师生参加！

广东省燃料电池技术重点实验室

化学与化工学院

2024年4月19日

报告内容：

Applying an external magnetic field to electrochemical reactions is recently an interesting topic among the electrocatalysis community. Earlier studies have shown that the water oxidation reaction (also called oxygen evolution reaction, OER) can be promoted by an external magnetic field through the promoted bubble removal on the electrode surface. However, that is for the case under the high overpotential and high current applied. In 2019, it has been reported that the promotion of OER in alkaline by applying the field is related to the magnetism of the electrode materials. On the other hand, theoretically, the OER needs to consider the triplet O2 formation, which involves the spin-polarized electron transfer. The spin-polarized electron transfer can be achieved by ferro(i) magnetic catalysts, however, which may not be easily proved experimentally. That is because in principle, an external magnetic field is not necessary for spin-polarized electron transfer on ferro(i)magnetic materials. It is also unclear about the reaction pathways with a consideration of spin-polarized electron transfer. The pH dependent enhancement has further generated confusion about the relation between magnetic field enhanced OER and the theoretical expectation. In addition, some magnetic catalysts do not exhibit any improvement under the magnetic field. All these phenomena have created a scientific puzzle, appealing to the community. In this talk, I will briefly discuss the progress of this field and several important experimental findings for solving the puzzle. The critical roles of magnetization, pinning effect, and pH dependent increment will be discussed in detail.       

将外部磁场应用于电化学反应最近是电催化界的一个有趣的话题。早期研究表明，外部磁场可以通过促进电极表面的气泡去除来促进水氧化反应（OER）。然而，这是在施加高过电势和高电流的情况下。 2019年有报道称，施加磁场对碱性条件下OER的促进作用与电极材料磁性有关。另一方面， OER需要考虑三线态O2的形成，其中涉及自旋极化电子转移。然而，自旋极化电子转移可以通过铁（i）磁性催化剂实现，这可能不容易通过实验证明。这是因为铁磁材料自旋极化电子转移不需要外部磁场。考虑到自旋极化电子转移反应途径也不清楚， pH 依赖性增强进一步引起了人们对磁场增强 OER 与理论预期之间关系的混淆。此外，一些磁性催化剂在磁场下没有表现出任何改善。所有这些现象都造成了科学难题，引起催化学界的高度关注。在本次报告中，我将简要讨论该领域的进展以及解决该难题的几个重要实验结果。我们将详细讨论磁化强度、钉扎效应和 pH 依赖提升的关键作用。

报告人简介：

Zhichuan is a professor in the School of Materials Science and Engineering, Nanyang Technological University (NTU) and a Fellow of the Academy of Engineering, Singapore. He serves as the director of the Centre of Advanced Catalysis Science and Technology, and the deputy director of CN Yang programme, NTU. He received his PhD degree in Electroanalytical Chemistry and B.S. degree in Chemistry from Lanzhou University, China. His PhD training was received in Lanzhou University, Institute of Physics, CAS, and Brown University. He worked in State University of New York at Binghamton as a Research Associate and then in Massachusetts Institute of Technology as a Postdoctoral Researcher. Dr. Xu has received several awards such as Chun-Tsung Endowment Outstanding Contribution Award - Excellent Scholar at 2018 and the Zhaowu Tian Prize for Energy Electrochemistry by International Society of Electrochemistry (ISE) in 2019. He was awarded Fellow of Royal Society of Chemistry (FRSC) in 2017. He serves as the president of ECS Singapore Section. Dr. Xu is a Highly Cited Researcher by Clarivate Analytics, Web of Science since 2018. 

徐梽川博士是南洋理工大学材料科学与工程学院教授、新加坡工程院院士。现任南洋理工大学先进催化科学与技术中心主任、杨振宁项目副主任。在兰州大学先后获得理学学士和博士学位，博士阶段先后在兰州大学、中科院物理研究所、布朗大学获得培养。他相继在纽约州立大学宾厄姆顿分校和麻省理工学院担任研究员和博士后研究员。徐梽川博士曾获2018年䇹政杰出贡献奖-优秀学者、2019年国际电化学会（ISE）田昭武能源电化学奖等奖项。他被授予英国皇家化学学会会士，担任ECS新加坡分会主席，徐梽川博士自 2018 年以来一直是高被引学者。