Seminar & Colloquium
[콜로퀴엄: 10월 16일(수), 오후 5시] Prof. Wei Pan, Tsinghua University
Title
고체 산화물 전해질에서 산소 이온의 확산도를 결정하는 새로운 접근법
(A new approach to determine the diffusivity of oxygen ions in solid oxide electrolytes)
Speaker
Prof. Wei Pan, School of Materials Science and Engineering, Tsinghua University
* Biography
Professor Pan, who was director of the State Key Laboratory of New Ceramics and Fine Processing in China, retired in 2022. He received a bachelor's degree in engineering from University of Science and Technology Beijing, China in 1982, a master's degree in engineering from Nagoya University, Japan in 1987, and a Doctor's degree in engineering from Nagoya University, Japan in 1990. He was a member of the Board of Trustees of Tsinghua University from 2017 to 2022; In 2009, He was awarded the fellow of the School of Engineering, University of Tokyo. He is a member of the Standing Committee of the Chinese Ceramic Society and a member of the editorial board of several international journals. He is also a member of World Academy of Ceramics; Member of the Advisory Board of the European Ceramic Association.
| Date | Wednesday, October 16th, 2024
| Time | 17:00 ~
| Venue | 43동 101호
[Abstract]
In-situ observation of ion motion in solid electrolytes is of great importance in understanding the transport phenomena underpinning the processing and properties of potential materials for advanced energy applications. Here, we present a facile and non-contact method to directly observe the motion of an ion in solid electrolytes. For example, we apply this method to measure ion diffusivity directly in oxygen and sodium conductive electrolytes. In this instance, an inhomogeneous distribution of the targeted ion in a solid is first created via an applied electric field (or magnetic, thermal, gradient, and other fields alternatively). Subsequently, the ion relaxes back to a uniform distribution as the external field is removed. The homogenization process is detected and recorded by a laser confocal micro Raman spectroscopy system. The diffusivity of the ion in solid electrolytes is subsequently determined by simulating and fitting the measured spatial and time-dependent concentration profiles. The obtained diffusivities are reliable. The measurement is non-contacting and facile, in comparison with existing alternative methods. By applying different external forces and detecting means, a generic method for the in-situ observation of ion motions and investigation of the ion transport mechanisms in solids is envisioned.
| Host | 한흥남 교수(02-880-9240)