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1. Á¦ ¸ñ : Direct methane fueled solid oxide fuel cells using partial oxidation of methane 2. ¿¬ »ç : ¹®ÁÖÈ£ ±³¼ö (¿¬¼¼´ëÇб³ ½Å¼ÒÀç°øÇкÎ) 3. ÀÏ ½Ã : 2013³â 06¿ù 24ÀÏ (¿ù) ¿ÀÈÄ 17:00 ~ 18:00 4. Àå ¼Ò : ¼¿ï´ëÇб³ ½Å°øÇаü(301µ¿) 117È£ ¼¼¹Ì³ª½Ç 5. ³» ¿ë : °íü»êȹ° ¿¬·áÀüÁö (Solid oxide fuel cells) Abstract : Solid oxide fuel cells (SOFCs) are the most promising technologies for highly efficient and sustainable energy production. Unlike the proton exchange membrane fuel cells that require hydrogen fueling, because they are based on proton conducting electrolytes, SOFCs can oxidize essentially any fuel, from hydrogen to hydrocarbons to even carbon, because the electrolyte transports an oxygen ion. With the advantage of fuel flexibility, SOFCs have a practical potential in which the existing hydrocarbon fuel infrastructure is readily used. In this respect, there are lots of interests for SOFCs working with the direct fueling of methane. Here, we introduce the direct methane fueled SOFCs, relying on partial oxidation of methane on conventional Ni electrodes. It is demonstrated that a simple reformer-free SOFC system can be constructed by control of the anode microstructure without the poisoning of Ni electrodes by carbon coking, which is commonly observed when methane is fed to SOFCs directly. To elucidate the detailed mechanisms of chemical/electrochemical reactions on Ni catalysts, the oscillation phenomena during the partial oxidation was studied via a novel in situ electrochemical characterization. The results show that the oxidation of Ni, which could be induced by the oxygen gas during the partial oxidation, occurs dominantly and selectively on two phase boundaries (2PBs) of Ni and gas, while Ni at three phase boundaries (3PBs) remains as metallic state. Therefore, Ni oxidation during the partial oxidation of methane can be prevented by the increase of relative 3PBs ratio. And the direct methane fueled SOFCs using partial oxidation of methane are fabricated and characterized. The SOFCs using yttria-stabilized zirconia (YSZ) for high temperature applications showed the maximum power density at 800oC (the same as the hydrogen fueling) with mixed gas condition of oxygen to methane ratio equals to 2 (CH4/O2=2), which is the stoichiometric composition of partial oxidation of methane. Also the SOFCs using gadolia-doped ceria (GDC) for low temperature SOFCs exhibited the maximum power density at 650oC under the mixed gas condition. Stable operation of 50 hours was achieved under the mixed gas condition, confirming that there was no carbon coking, and the decrease of polarization resistance was observed when it was compared with the operation under the pure methane, which indicates the enhanced kinetics of methane cracking by the oxygen.
6. ¾à ·Â : Çз»çÇ× 1986-1990 ¿¬¼¼´ëÇб³ ¼¼¶ó¹Í°øÇаú Çлç 1992-1995 Univ. of Florida Àç·á°øÇаú ¼®»ç 1995-1996 Univ. of Florida Àç·á°øÇаú ¹Ú»ç
°æ·Â»çÇ× 1996-1998 M.I.T Àç·á °øÁ¤ ¼¾ÅÍ / Research Associate 1998-2000 ÀϺ» Åë»ó¼º »ê¾÷±â¼ú¿¬±¸¿ø (AIST) / Ãʺù¿¬±¸¿ø 2000-2003 ¿¬¼¼´ëÇб³ ½Å¼ÒÀç°øÇкΠ/ Á¶±³¼ö 2003-2009 ¿¬¼¼´ëÇб³ ½Å¼ÒÀç°øÇкΠ/ ºÎ±³¼ö 2006-2007 ¹Ì±¹ Univ. of Washington / ¹æ¹®±³¼ö 2009-ÇöÀç ¿¬¼¼´ëÇб³ ½Å¼ÒÀç°øÇкΠ/ Á¤±³¼ö
¹® ÀÇ : ¸ÖƼ½ºÄÉÀÏ ¿¡³ÊÁö ½Ã½ºÅÛ ¿¬±¸´Ü ¿¬±¸Áö¿øº»ºÎ (¢Î 889-6669,6670) ³²±âÅ ±³¼ö (Àç·á°øÇкÎ), ÃÖ¸¸¼ö ±³¼ö (±â°èÇ×°ø°øÇкÎ)
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