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A New Cathode for Reduced-Temperature Molten Carbonate Fuel Cells
Nguyen, Hoang Viet Phuc,Kang, Min Goo,Ham, Hyung Chul,Choi, Sun Hee,Han, Jonghee,Nam, Suk Woo,Hong, Seong-Ahn,Yoon, Sung Pil The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.14
<P>Oxygen solubility is the rate-determining step (RDS) for the reduction reaction on the cathodes of molten carbonate fuel cells (MCFCs), especially at low operating temperatures below 600°C. The poor wetting property of the mixed ionic and electronic conductor (MIEC) coating, such as BYS (Bi<SUB>1.5</SUB>Y<SUB>0.3</SUB>Sm<SUB>0.2</SUB>O<SUB>3-δ</SUB>) on the NiO cathode, to the liquid electrolyte creates openings where oxygen absorption and dissociation take place to provide more oxide ionic species to electrochemical reaction sites (ERSs). Therefore, poor wetting MIEC-coated cells showed a much higher power density compared to standard cells, with a factor of 1.4 at the low operating temperature of 550°C. Long-term operation of 2500 hours with a low voltage loss of 9 mV suggests that BYS is a promising alternative cathode material for molten carbonate fuel cells.</P>
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
안호원,김대호,Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman,Hoang Viet Phuc Nguyen,한종희,윤성필 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO2 at temperature above the melting point of the carbonate. The CO2 permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1 × 10-8 mol/m2/Pa/s at temperature >650 ℃. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macro-porous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
Ahn, Howon,Kim, Daeho,Melgar, Ví,ctor Manuel Aceituno,Kim, Jinsoo,Othman, Mohd Roslee,Nguyen, Hoang Viet Phuc,Han, Jonghee,Yoon, Sung Pil Elsevier 2014 Journal of industrial and engineering chemistry Vol.20 No.5
<P><B>Abstract</B></P> <P>A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO<SUB>2</SUB> at temperature above the melting point of the carbonate. The CO<SUB>2</SUB> permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1×10<SUP>−8</SUP> mol/m<SUP>2</SUP>/Pa/s at temperature >650°C. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macroporous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.</P>