Speakers

Sorbent Materials for Safe and Efficient Energy Storage

Jisoon Ihm
Jisoon Ihm
Seoul National University (SNU), Korea
December 6, 2012, 11:50 ~ 12:30

Abstract :

Recently, carbon-based sorbent materials have attracted great interest as a light-weight energy storage medium. Graphite has already been used for the anode material of Li-ion batteries and various organic or inorganic carbon-based materials have been proposed to be used for hydrogen storage. In both cases, the materials have a large surface area and void spaces to easily attach and detach Li-ions or hydrogen molecules through empty channels. We will focus on the molecular hydrogen storage materials in this presentation. Hydrogen is a highly appealing energy carrier not only for vehicles but also for distributed power plants, individual buildings, and portable devices. If used together with the hydrogen fuel-cell, its energy efficiency is one of the highest among all known technologies. At present, the hydrogen storage technology is an essential requirement in the development of the hydrogen fuel-cell powered vehicles. We carry out first-principles electronic and atomic structure calculations to search for hydrogen storage materials among low-dimensional nanomaterials, metal organic frameworks(MOFs), porous silica, carbide-derived carbon, graphene oxide, and some bio-inspired materials, decorated with extra metal atoms. In this system, hydrogen molecules are adsorbed to transition metal atoms (e.g., Ti and Fe) which are bound to the carbon-based scaffold structure. Contributions of dipole interactions and so-called “Kubas” interactions to the molecular hydrogen binding are investigated and the influence of spin states on the stability of the adsorption is examined. We also report recent efforts and achievements in synthesizing transition-metal-decorated, OH-functionalized MOFs. Introducing organo-metallic precursors is emphasized as a critical step in the synthesis process. Strategies to suppress metal clustering and oxidation are presented and practical questions in material synthesis are discussed.

 

Research Interests :

  • Computational Design of Hydrogen-Storage Nanomaterials
  • Electronic Structure and Nonequilibrium Transport of Graphene and Carbon Nanotubes
  • Wrinkle and Folding in Composite Material Structures
  • Electronic and Atomic Structures of Novel Materials and Molecules

 

Prizes(of recent 10 years) :

  • National Decoration by President of Korea (2003)
  • “National Scholar of Korea” by Ministry of Education (2006)
  • First Cheong-Am Award in Science (2007)
  • “Korean Scientist of Highest Honor” by President of Korea (2007)
  • Fellow of American Physical Society (2007)
  • Asian Consortium on Computational Materials Science Award at ACCMS-5 (2009)
  • Distinguished Professor of Seoul National University (2009)
  • Foreign Associate of National Academy of Sciences of USA (2011)