Department of Chemical and Biomolecular Engineering
Korea Advanced Institute of Science and Technology

Faculty

Hee Tak Kim (김희탁)

Associate Professor

Tel : +82-42-350-3916
Fax : +82-42-350-3910
E-mail : heetak.kim@kaist.ac.kr
Homepage : http://eed.kaist.ac.kr
Education
- Ph.D. in Chem. Eng., KAIST, 1999
- M.S. in Chem. Eng., KAIST, 1995
- B.S. in Chem. Eng., KAIST, 1993

Employment and Professional Experience
- KAIST, Associate Professor in Dept. of Chemical & Biomolecular Eng. : 2013.7~
- SAMSUNG SDI, Principal Engineer : 2009.3~2013.7
- SAMSUNG SDI, Senior Engineer : 2003.3~2009.2
- NESS, Principal Engineer : 2001.11~2002.11
- IAE, Senior Engineer : 1999.3~2001.10

Awards and Honors
- SAMSUNG Best Paper Award, Samsung Electronics, 2011
- SAMSUNG SDI Best Paper Award, Samsung SDI, 2005
- Chairman of Board of Directors Award, KAIST, 1993
- Gold Award, Undergraduate Contest on Transport Phenomena Korean Society of Chemical Engineering, 1992

Research interests
- Polymer electrolyte fuel cells : Ultra-low Pt loading MEA, High powered MEA
- Next generation batteries : Lithium Sulfur, lithium Air, Redox Flow Batteries
- Battery safety enhancing technologies : Functional Separator, Polymer Electrolyte, Battery Additives

Selected Publications
1. Effect of air purging and operating condition on Freeze Damage of Polymer Electrolyte Fuel Cell, Int. J. Hydrogen Energy, 36, 12417-12426 (2011)
2. Electrochemical Analysis of Polymer Electrolyte Membrane Fuel Cell Operated with Dry-air Feed, J. Power Sources, 193, 515-522 (2009)
3. Deterioration of Nation 115 in Direct Methanol fuel Cells, J. Power Sources, 191, 312-319 (2009)
4. Effect of the Porous Carbon Layer in the Cathode Gas Diffusion Media on Direct Methanol Fuel Cell Performances, Int. J. Hydrogen Energy, 34, 8257-8262 (2009)
5. Cathode Catalyst Layer Using Supported Pt Catalyst on Ordered Mesoporous Carbon for Direct Methanol Fuel Cell, J. Power Sources, 180, 724-732 (2008)

Electrochemical Energy Device Laboratory
Polymer Electrolyte Membrane Fuel Cell,
Next Generation Batteries

■ Polymer Electrolyte Membrane Fuel Cell

Polymer electrolyte membrane fuel cell is now opening up new energy industries as exampled by fuel cell electric vehicle and micro combined heat and power generation. EED lab studies micro- and nano-structural design of membrane electrode assembly with an aim to reduce the usage of expensive catalyst not losing or even enhancing durability and power performance of fuel cell. The control of interactions among ionomer, catalyst, and support expands proton-accessible active catalyst surface, and the evolution of nano-scale separation of hydrophobic and hydrophilic domains maintains air-accessible active catalyst surface even at ultra high current densities. We pursue deeper understanding on ionic and mass transport under ultra low catalyst loading and low humidity operation, and support material researchers in introducing their innovative material solutions to fuel cell devices.

 

Also, we attempt to elucidate the degradation mechanism at various operation modes and improve durability by physic-chemical control of membrane/catalyst layer, catalyst layer/diffusion layer, and catalyst/ionomer interface.

  

■ Next Generation Batteries

We explore new battery solutions which extend cruise range of electric vehicle and provide better economics for energy storage system. Our researches include sulfur and air electrode designs with practical applicability, doughty attempt to realize lithium metal secondary battery, and fusion of battery, capacitor, and fuel cell principals such as hybrid capacitor and redox flow battery. We are interested in specific issues of how to accelerate the sulfur and air redox reaction and how to prevent the self discharge of these active materials.

The acceleration of redox reaction by electrochemical mediator is one of the approaches we take to enhance rate capability of sulfur and air.

The battery safety is one of relatively unexplored fields in spite of its enormous practical importance. EED lab develops inorganic-organic hybrid separator, solid electrolyte, and protection layer-forming additives with an eye to enhancing battery safety under various abuse conditions.