세미나

Design and exploration of advanced materials for lithium-ion batteries and beyond

Design and exploration of advanced materials for lithium-ion batteries and beyond   Kisuk KANG Professor College of Engineering, Seoul National University, Korea   Abstract    High-performance and cost-effective rechargeable batteries are key to the success of electric vehicles and large-scale energy storage systems. Extensive research has thus focused on the development of new high-energy electrodes that can store more lithium at faster rates with stable cycle performance. However, the current status of lithium batteries still remains far below the demands required for the proposed applications. In this presentation, I introduce our approaches to address this issue, which include the discovery of new energy storage mechanism in the electrode for lithium ion batteries, bio-mimetic batteries and some developments made in the field of post lithium ion batteries in our group....

안전규제 심,검사 제도 및 주요 현황

Enhancement of cyclone separators for various applications

에어로졸은 기체 중에 떠 있는 고체 또는 액체의 입자상 물질(particulate matter; PM)을 말한다. 우리가 호흡하는 공기 중에는 수십 μm 이하 크기의 입자상 물질이 부유해 있으므로, 공기는 우리가 일상생활에서 가장 흔히 접할 수 있는 에어로졸의 한 예이다. 공기 중에 떠 있는 10 μm보다 크기가 작은 입자상...

Weighted Mobility Ratio Engineering for High-Performance Bi-Te-Based Thermoelectric Materials

Band engineering is an effective strategy to improve the electronic transport properties of semiconductors. In thermoelectric materials research, density-of-states effective mass is an undoubted key factor in verifying the band engineering effect and establishing a strategy for enhancing thermoelectric performance. However, estimation of the effective...

Our drinking water resources are safe enough?

Our drinking water resources are safe enough? Urban and Environmental Engineering, UNIST Kyunghwa Cho Our drinking water is constantly being threatened. If so, can't the current level of science and technology be able to eliminate these substances? Not like that. Currently, these contaminants can be removed through...

Introduction to Kinetic Simulation of Magnetized Plasma

Efficient perovskite solar cells and light-emitting diodes

Three dimensional bioelectronic interfaces to brain spheroids and assembloids

Complex, three dimensional (3D) assemblies of micro/nanomaterials form naturally in biological systems, where they provide sophisticated function in even the most basic forms of life.  In spite of their broad potential utility in man-made devices, design options for analogous abiotic 3D mesostructures are severely constrained...

Wearable Flexible Hybrid Electronics: Smart Bioelectronic Pacifier for Real-Time Continuous Monitoring of Salivary Electrolytes

Hyo-Ryoung Lim Major of Human Biocovergence, Division of Smart Healthcare, College of Information Technology and Convergence, Pukyong National University, Busan, Korea Monitoring electrolytes is critical for newborns and babies in the intensive care unit. However, the gold standard methods use a blood draw, which is painful and only offers...

Heterogeneous Atomic Catalysts Overcoming the Limitations of Single-Atom Catalysts

Heterogeneous Atomic Catalysts Overcoming the Limitations of Single-Atom Catalysts   Prof. Hyunjoo Lee Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea   Recent advances in heterogeneous single-atom catalysts (SACs), which have isolated metal atoms dispersed on a support, have enabled more precise control of their surface metal atomic structure. SACs could reduce the amount of metals used for the surface reaction, and have often shown unique selectivity, which the corresponding nanoparticles would not have. However, the SACs typically have the limitations of low metal content, poor stability, oxidic electronic states, and the absence of ensemble sites. Here, I will introduce our recent efforts to overcome these limitations. For instance, highly durable SACs could be prepared by anchoring the metal atoms strongly on the defective support, metallic SACs were synthesized, and the ensemble catalysts, in which all the metal atoms are exposed at the surface like the SACs but the surface metal atoms are located nearby, were also successfully synthesized. We applied these heterogeneous atomic catalysts for automobile exhaust treatment (three way catalyst; TWC or diesel oxidation catalyst; DOC) or electrochemical reactions (formic acid oxidation; FAOR or oxygen reduction reaction; ORR). Heterogeneous atomic catalysts, whose structure is elaborately controlled and the surface reaction is better understood, can be a new paradigm with higher catalytic activity, selectivity, and durability, and used in industrial applications....