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：2024年5月20日下午15:00
报告人：Prof. Dae-Yong JEONG（INHA University, KOREA）
报告地点：清华大学逸夫技术科学楼A205学术报告厅
邀请人：李敬锋老师
纳米结构碳材料：Nano-size Crystalline & Amorphous PZT Composite for Energy Storage Applications
报告简介：
Pb(Zr0.52Ti0.48)O3 (PZT) is well known normal ferroelectric material and has been intensively studied over century. For energy storage application, normal ferroelectric has several drawbacks such as low breakdown field and poor charging/discharging efficiency due to large hysteresis. Low breakdown field of crystalline PZT can be mitigated by introducing the amorphous phase to form a composite. High efficiency can be realized by making large hysteresis into slim shape. Here, a novel nanograin engineering approach based upon high kinetic energy deposition is reported, for mechanically inducing the relaxor ferroelectric behavior in a composite of crystalline and amorphous PZT, which results in simultaneous enhancement in the dielectric breakdown strength and high efficiency. Aerosol deposited thick films with 4 μm thickness exhibit an exceptional breakdown field of 540 MV/m and reduced hysteresis with energy-storage density of 124.1 J/cm3 and a power density of 64.5 MW/cm3. This approach is correlated with the generalized nanostructure design that comprises nanocrystalline phases embedded within the amorphous matrix.
报告人简介：
Prof. Dae-Yong JEONG, serving as the Dean of Graduate of Engineering and a professor in the Department of Materials Science and Engineering at Inha University, Korea. Graduating from Seoul National University with both undergraduate and master degrees. He received Ph.D. degree in Materials at Pennsylvania State University in 2004. Following this, he worked as a research scientist at TRS Ind. (USA) and RIEC at Tohoku University (Japan). After returning to Korea, he contributed as a senior researcher at KIST and as an assistant professor at Myongji University before joining Inha University as a professor in Sep. 2011. His current research interests include energy harvesting, ferroelectrics, nano-engineering for materials development, high energy density capacitor, and piezoelectric devices. Additionally, he has an interest in innovative Engineering Education and Intellectual properties.