清华大学材料科学与工程研究院《材料科学论坛》学术报告

报告时间：2026年8月12日上午10:00-11:30

报告人：Prof. Hyung-Tae Lim（韩国昌原国立大学）

报告地点：清华大学逸夫技术科学楼A205会议室

邀请人：伍晖老师

报告题目：From Lithium Dendrites to Ceramic Cells: Operando Insights into Interfacial Charge Transport and Degradation in SOECs and PCECs

报告摘要：

Interfacial degradation driven by mixed ionic-electronic conduction severely limits the durability of electrochemical devices. Drawing inspiration from lithium-ion batteries, where localized electronic conduction and poor ionic transport accelerate dendrite formation, this study elucidates analogous degradation pathways in solid oxide electrolysis cells (SOECs) and protonic ceramic electrolysis cells (PCECs). In SOECs, an advanced operando probe successfully quantified localized oxygen partial pressure (pO2) buildup at the electrode/electrolyte interface, which induces chemo-mechanical delamination. Conversely, in PCECs, increasing current density triggers an entirely different regime: a severe internal hydrogen depletion and subsequent pO2 spike. This thermodynamic distortion injects electron holes, leading to a substantial loss in Faradaic efficiency rather than mechanical failure. Ultimately, this work demonstrates that the mismatch between ionic and electronic transport at solid-state interfaces manifests as distinct failure modes depending on the system, mechanical destruction in SOECs and chemical efficiency loss in PCECs. By bridging battery kinetic principles with high-temperature ceramic interfaces, these findings offer critical strategies for diagnosing and mitigating multi-charge carrier-induced failure across diverse electrochemical environments.

报告人简介：

Hyung-Tae Lim is a Full Professor at Changwon National University and an Adjunct Associate Professor at the University of Utah, where he earned his Ph.D. and M.S. degrees after completing his B.S. at Inha University. His expertise lies in advanced energy materials, specifically solid oxide cells (SOFC), electrolysis cells, and all-solid-state lithium batteries. Professor Lim has led over 20 government-funded R&D projects focusing on green hydrogen and high-stability batteries. He has published over 80 SCI journal papers and holds more than 20 registered patents. Recognized for excellence in research and education, he received the Academic Progress Award from the Korean Ceramic Society (2026), the Outstanding Research Award from Changwon National University (2025), and the Best Teaching Award (2022). He was also honored with the Academic Presentation Award from the Korean Hydrogen and New Energy Society (2024).