报告题目：The Icing on the Perovskite: How Binary Oxide Layers Sweeten Oxygen Kinetics in Electrodes
报告时间：2025年11月24日（星期一）下午13:30~14:00
报告地点：新能源大楼215会议室
报告摘要：
Decorating the surfaces of perovskite oxide electrodes with modification layers of simple binary oxides has attracted widespread interest from the solid oxide cell community as an effective means of enhancing electrode performance. It has also been shown that the acidity of the binary oxide surface modification layer serves as a key descriptor for predicting the effectiveness in accelerating the kinetics of the oxygen incorporation/evolution reaction (OIR/OER). Nevertheless, there is no consensus on the underlying mechanism(s) of surface modification, with existing explanations in the literature ranging from surface space charge layers to the tuning of surface potentials and the adsorption of gas molecules. We used an oxide heterostructure of (La,Sr)(Co,Fe)O3 (LSCF, electrode)/PrOx (modification) with well-defined geometry and microstructure to elucidate the physical origin of the increased oxygen exchange kinetics. First, the defect chemistry of both LSCF and PrOx was carefully studied, which showed that the bulk defect concentration, controlled by oxygen chemical potential, could be quantitatively linked to OIR/OER current density. Second, charge transfer between LSCF and PrOx was revealed by operando X-ray absorption spectroscopy, which impacts the reaction mechanism at electrode surfaces. Finally, we used in situ pulsed laser deposition (PLD) to demonstrate that the change in the density of surface active sites, rather than other factors, most likely accounts for the modified electrochemical reactivity of perovskite electrodes.
报告人简介：
Dr. Qiyang Lu is currently an assistant professor in the Department of Materials Science and Engineering at Westlake University (Hangzhou, China). He received his bachelor’s degree from Tsinghua University and his PhD degree from Massachusetts Institute of Technology (MIT), both in Materials Science and Engineering. His PhD work was awarded the best PhD thesis award from MIT DMSE. He did postdoctoral research at Stanford University with a joint fellowship at Advanced Light Source, Lawrence Berkeley National Laboratory. He is the recipient of the Ross Coffin Purdy award from American Ceramic Society and also one of the finalists of the Young Scientist Award of International Society for Solid State Ionics in 2024. His current research interest is focused on designing ionic defects in mixed electronic and ionic conducting oxide thin films for reversible solid state electrochemical cells, electrocatalysts and ionotronic devices.
报告人照片：
联系人：韩东麟