Huen+Lee
-
Storing Stably Hydrogen Atoms in Icy Materials Discovered
KAIST, Aug. 8, 2008 -- A KAIST research team led by Prof. Huen Lee of the Department of Chemical & Biomolecular Engineering has discovered that icy organic hydrates, which contain small cages that can trap guest molecules, can be used to create and trap hydrogen atoms at higher temperatures.
The properties and reactions of single hydrogen atoms are of great scientific interest because of their inherent quantum mechanical behavior; experimentally, they can be generated and stabilized at very low temperatures (4 K) by high-energy irradiation of solid molecular hydrogen.
The finding was reported in the journal of American Chemical Society and featured in the "Editor"s Choice" in the July 11 issue of Science as a recent research highlight.
Hydrogen is a clean and sustainable form of energy that can be used in mobile and stationary applications. Hydrogen has the potential to solve several major challenges today: depletion of fossil fuels, poor air quality, and green house gas emissions.
However, the trapping of hydrogen atoms in crystalline solid matrix has never been attempted mainly because of experimental difficulties in identifying the generated hydrogen atoms with either spectroscopic or microscopic technique.
"To overcome the barriers and limitations of the existing storage approaches, we have continuously attempted to find the new hydrogen storage media such as icy powders and other related inclusion compounds," said Prof. Lee
The discovery follows the breakthrough concept Prof. Lee"s research team proposed in Nature in 2005 to use pure ice to capture and store hydrogen molecules. At moderate temperature and pressure conditions small guest molecules are entrapped in pure ice powders to form the mixed icy hydrate materials.
"Stable existence of single hydrogen molecule/radical in icy crystalline matrices may offer significant advantages in exploring hydrogen as a quantum medium because icy hydrogen hydrates can be formed at milder conditions when compared with pure solid hydrogen, which requires the ultra low temperature of 4.2 K," said Prof. Lee.
The novel design and synthesis of ionic and radicalized icy hydrates are expected to open a new field for inclusion chemistry and ice-based science and technology. Specifically, the fact that hydrogen atoms can be stably stored in icy materials might provide versatile and practical applications to energy devices including fuel cells, ice-induced reactions, and novel energy storage process, according to the KAIST professor.
2008.08.07 View 12644 -
Best Academic Award to Prof. Huen Lee
Professor Huen Lee, Department of Chemical and Biomolecular Engineering, received the Best Prize of KAIST Academic Awards at the 36th anniversary ceremony of KAIST.
Professor Lee has published 43 international papers and 12 domestic papers for the past five years and achieved world’s distinguished academic performances such as the development of hydrogen storage technologies, the discovery of the principle on carbon dioxide-methane hydrate swapping, etc.
Professor Lee published his paper on methane hydrate at Science in 2003, and Nature introduced his paper on hydrate storage technologies as ‘highlight research’ in 2005, commenting his research as a landmark performance to pave ways for the development of future hydrogen energy. His discovery on ‘the principle of carbon dioxide-methane hydrate swapping’, published by PNAS in 2006, also gained huge attraction across the world as one of the promising technologies that can solve energy problem and global warming crisis simultaneously.
Meanwhile, the rest of the awardees of 2007 are as follows:
- Academic Award: Professor Jongkyeong Chung, Dep. of Biological SciencesAssociate professor Changok Lee, Dep. of MathematicsAssociate professor Sangkyu Kim, Dep. of ChemistryProfessor Dae-gab Gweon, Dep. of Mechanical Engineering
- Creative Lecture Award: Associate professor Jaehung Han, Dep. of Aerospace Engineering
- Excellent Lecture Award: Assistant profess Bong Gwan Jun, School of Humanities & Social Science Professor Joonho Choe, Dep. of Biological Sciences Professor Changwon Kang, Dep. of Biological Sciences Professor Seunghyup Yoo, Div. of Electrical Engineering Associate professor Otfried Cheong, Div. of Computer Science Professor Hoe Kyung Lee, Graduate School of Finance
- Contribution Award: Professor Sung Chul Shin, Dep. of Physics Professor Bowon Kim, Graduate School of Culture Technology Professor Jisoo Kim, Graduate School of Finance
- International Cooperation Best Award: Professor Hyung Suck Cho, Dep. of Mechanical Engineering
- International Cooperation Award: Professor Kunpyo Lee, Dep. of Industrial Design Professor Soon Hyung Hong, Dep. of Materials Science & Engineering Professor Sungjoo Park, Graduate School of Culture Technology
2007.03.19 View 17298