题目：Understanding Metal Nano-particle Exsolution

时间：2024年11月15日 9:30-11:00

地点：j9九游会官方网页版 F203会议室

邀请人：倪娜 副教授（叶轮机械研究所）

Biography

Dr. Ji Wu joined the Queen Mary University of London in 2023. Before that, Ji has worked as Research Associate at University of Bath, and the International Institute of Carbon-Neutral Energy Research (I2CNER), Kyushu University, Japan. He received his BEng. and Ph.D degree from Imperial College London under the supervision of Prof. John Kilner and Prof. Andrew Horsfield. His research interests are mainly focused on improving solid oxide fuel cell materials and oxide catalysts for oxygen reduction and hydrogen evolution reactions. These materials are key to the realization of a sustainable future and a greener energy utilization cycle. Using theoretical tools including Ab Initio simulation, molecular dynamics method, Monte Carlo methods and classic thermodynamics, many new insights and understandings are achieved through his work and published in Nature Communication, Advanced Energy Materials, Journal of the American Chemical Society (Citation ~ 1000, H-Index 13). With a solid background in experimental techniques, especially surface analyses and diffraction based structural analyses, Ji is very keen to combine the theoretical insights with state-of-the-art experiments.

Abstract

Metal Nano-particle Exsolution is an intriguing phenomenon which has been demonstrated in a variety of host-oxide and exsolute-metal combinations. The exsoluted metal nano-particles are socketed into the host oxide and are therefore very stable compared to deposited metal nano-particles. It draws significant interest due to its exceptional redox cycling durability and resistance to catalytic poisoning. Despite the vast amount of experimental results exhibiting the phenomenon’s universality and versatility, the theoretical understanding on the mechanisms behind this phenomenon is rather limited. Two case studies, Ar Plasma driven accelerated Ni exsolution in CaTiO3 and Ir exsolution in SrTiO3, were explored with closely coupled experimental characterisations and theoretical modelling methods to understand what has happened to the exsoluted metal cations during this phenomenon.