A5028821459- Chemical Synthesis and Characterization
- Inorganic Fluorides and Related Compounds
- Metal-Organic Frameworks: Synthesis and Applications
- Fuel Cells and Related Materials
- Analytical chemistry methods development
- Advanced Battery Technologies Research
- Zeolite Catalysis and Synthesis
- Hydrogen Storage and Materials
- Gas Sensing Nanomaterials and Sensors
- Microfluidic and Capillary Electrophoresis Applications
- Nuclear Physics and Applications
- Advancements in Solid Oxide Fuel Cells
- Advanced NMR Techniques and Applications
- Copper Interconnects and Reliability
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
Ulsan National Institute of Science and Technology
2024-2025
For the separation of hydrogen isotopes (H2/D2), traditional kinetic quantum sieving (KQS) takes advantage diffusion barriers created by flexibility organic linkers and breathing frameworks in porous solids. While phenomena have been observed typically below 77 K, this study, we present that a copper-based zeolite imidazolate framework (Cu-ZIF-gis) can show KQS above 120 K. Since Cu-ZIF-gis has narrow channels with ca. 2.4 Å aperture, small pore size itself acts as barrier. This barrier...
The alarming increase in atmospheric CO2 levels, driven by fossil fuel combustion and industrial processes, is a major contributor to climate change. Effective technologies for selective removal are urgently needed, especially gas streams like flue biogas, which contain impurities such as N2 CH4. In this study, we designed synthesized molecularly imprinted polymers (MIPs) using 4-vinylpyridine(4VP) methacrylic acid(MAA) functional monomers, thiophene(Th) formaldehyde(HC) molecular templates....
<title>Abstract</title> This study presents a novel approach for hydrogen isotope separation using Cu-ZIF-<italic>gis</italic>, Cu-based zeolitic imidazolate framework with ca. 2.4 Å channels. Traditional Kinetic Quantum Sieving(KQS) method involves exploiting diffusion barriers, caused by the flexibility of local linker molecules or unit cell breathing phenomena. However, these methods are ineffective at high temperatures, as such opening transition typically completes below 77K....
Entropy‐driven strategy enables the systematic design of complex systems by using entropy as a quantifiable parameter for degree mixing. In this study, we present mixed‐linker zeolitic imidazolate frameworks (ZIFs), sod‐ZIF‐1 series, that features two types six‐membered rings (6MRs) with aperture sizes 3.4 Å and 1.7 Å. By adjusting configurational entropy, ratio these 6MRs can be systematically controlled, which significantly influences adsorptive properties, particularly improving H2...
직접보로하이드라이드 연료전지는(direct borohydrides fuel cell. DBFC) 직접메탄을 연료전지가 갖는 메탄을 크로스오버(crossover)문제를 해결할 수 있어서, 휴대용 및 이동용 전원으로 활용하기 위하여 새롭게 대두되고있는 연료전지이다. 본 논문에서는 연료전지의 전극제조 공정 확립을 여러 가지의 연료극 공기극 촉매를 선정하고 열가압법 (hot pressing)으로 전극을 제조하여 이에 대한 성능 특성을 고찰하였다. 촉매로는 Pt/C와 Pt black을 사용하였고, Pt/C. black, Au/C, <TEX>$AB_5$</TEX> alloy를 사용하였다 제조된 전극 촉매는 XRD, SEM, EDS 등을 통한 특성 분석과 단위전지 운전을 통하여 I-V특성 분석이 이루어졌다. 다양한 촉매 조합을 촉매별 단전지 테스트를 한 결과 Pt/C로 했을 때 가장 높은 성능인 366mW/mg을 얻을 있었다. Direct cell (DBFC) was emerged to...