Download Advances in Solid Oxide Fuel Cells VII: Ceramic Engineering by Narottam P. Bansal, Prabhakar Singh, Sujanto Widjaja, Dileep PDF

By Narottam P. Bansal, Prabhakar Singh, Sujanto Widjaja, Dileep Singh

This ebook is a set of papers from the yankee Ceramic Society's thirty fifth overseas convention on complicated Ceramics and Composites, held in Daytona seashore, Florida, January 23-28, 2011. This factor comprises papers offered within the eighth overseas Symposium on stable Oxide gasoline Cells: fabrics, technology, and expertise on subject matters resembling telephone and Stack improvement; Electrochemical/Mechanical/Thermal functionality; Electrodes; Interconnects; Novel Cell/Stack layout and Processing; and Reliability/Degradation.Content:

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Extra info for Advances in Solid Oxide Fuel Cells VII: Ceramic Engineering and Science Proceedings, Volume 32

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From Eq. (14) capacitanc e dependenc e on temperatur e can not be easily estimated . In case of pure electroni c conductor we get similar expressions but with different physical meaning. The derivationof these equation s is described in [12]. 3) TPB L - three phase boundary length per unit electrod e area t, 2 = 1/K - characteristi c relaxatio n time. The polarizatio n resistanc e depends in this case on TPBL , surface diffusion coefficient , surface concentratio n of adsorbed species (r 8 eq) and surface reaction coefficien tK R 12 - 1 RT TPBL T{zFf elDA (DeV K l RT TPBL T(zF)2e°De L c m) Advances in Solid Oxide Fuel Cells VII • 45 Electrochemical Phenomena in MEA Electrodes The P02 dependenc e of the polarizatio n resistanc e is mainly defined by term K"" 2.

Using develope d paste processing routes, all pastes have been prepare d with batch sizes up to 2 kg. ) independen t from scatterin g of propertie s of raw materials . Additional wetting agents were used to improve screen printing characteristic s such as thickness uniformity, which are very important for large area prints required for cathode and anode application . For screen printing commerciall y available sintered electrolyte s with dimensions of 50x50 mm2 made of lOSclCeSZ were used. The thickness of the substrate s varied from 110 urn to 210 um.

C,,c Advances in Solid Oxide Fuel Cells VII • 49 Electrochemical Phenomena in MEA Electrodes The polarizatio n resistance s and capacitance s of air electrod e as a result of oxygen utilizatio n at the TPB for different P0 at 850C are summarized in Table I (we have used effective value of Do2=*D2i=2,lxlO~A m2 /s with tortuosity r factor of 0,5 for our estimations) . Table I Polarizatio n resistanc e and capacity values resulting from air conversion at 850C. X0 R C =0,02 l,Nen,sl'"miiccm' ,,Gas ’" F Xn =0,04 =0,08 X„ u X„ =0,21 2 6,46 3,16 1,52 0,50 2,76 5,52 11,03 28,96 From these estimation s one can see that the polarizatio n resistanc e due to oxygen conversion is negligible (<1 tnflcm2 ) up to P0 =8% .

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