Hyunchul Oh
UNIST · Materials Science
오현철 교수의 연구실은 수소 이소토프 분리 및 고체 흡착제 기반의 고효율 가스 분리 기술을 핵심으로 하며, 특히 수소와 중수소의 분리에 있어 에너지 효율성이 뛰어난 나노다공성 흡착제를 개발하고 있습니다. 활성탄, 금속 유기 프레임워크(MOF), 천연 생체재료를 활용한 고표면적 다공성 소재의 합성과 응용을 통해 수소 저장, 이산화탄소 포집, 에너지 저장 등 다양한 에너지·환경 응용 분야에 기여하고 있습니다. 특히, 양자 체류 효과와 기계적 유연성을 활용한 동적 분리 메커니즘 연구로 기존의 냉각 증류 및 황화물 공정을 대체할 수 있는 혁신적 기술을 모색하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Separating gaseous mixtures that consist of very similar size is one of the critical issues in modern separation technology. Especially, the separation of the isotopes hydrogen and deuterium requires special efforts, even though these isotopes show a very large mass ratio. Conventionally, H/D separation can be realized through cryogenic distillation of the molecular species or the Girdler-sulfide process, which are among the most energy-intensive separation techniques in the chemical industry. H
Highly efficient activated carbon prepared from renewable resources that has an excellent storage capacity for various gases (H<sub>2</sub>, CH<sub>4</sub>, and CO<sub>2</sub>).
Adsorptive separation using narrow-micropore adsorbents has demonstrated the potential to separate hydrogen isotopes. In this work, we employed an isotope-responsive separation using cobalt formate. A D<sub>2</sub>-responsive third sorption step was revealed, and consequently, a noticeable difference was observed in the uptakes of D<sub>2</sub> and H<sub>2</sub>. This may have resulted from the additional space created for D<sub>2</sub> due to its dense packing, as DFT calculations revealed that
The physical upper limit of hydrogen uptake for powder and compressed pellet MIL-101 has been experimentally investigated. Maximum uptake in pellets at 20 K achieves 9.6 wt% and 42 g L−1. Moreover, cryo-adsorption of hydrogen on pellets compared to liquid H2 possesses a larger temperature window for operation without boil-off loss, which will be beneficial for industrial applications.
High surface area porous carbon with fibrous microstructure offers a broader application potential than powder form. However, controlling the microstructure with high porosity is difficult, and if possible then through a complex and time-consuming synthesis method. Herein, the development of high surface area nanoporous activated carbon fiber by activating spider silk (natural biomaterials) using potassium hydroxide is being reported. The specific surface area (SSA) and total pore volume for the
Kinetic-quantum-sieving-assisted H<sub>2</sub> :D<sub>2</sub> separation in flexible porous materials is more effective than the currently used energy-intensive cryogenic distillation and girdle-sulfide processes for isotope separation. It is believed that material flexibility results in a pore-breathing phenomenon under the influence of external stimuli, which helps in adjusting the pore size and gives rise to the optimum quantum-sieving phenomenon at each stage of gas separation. However, only
