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Kim, H.J.,Kim, M.,Neoh, K.C.,Han, G.D.,Bae, K.,Shin, J.M.,Kim, G.T.,Shim, J.H. Elsevier Sequoia 2016 Journal of power sources Vol. No.
Thin ceramic bi-layered membrane comprising yttria-stabilized zirconia (YSZ) and gadolinia-doped ceria (GDC) is fabricated by the cost-effective slurry spin coating technique, and it is evaluated as an electrolyte of solid oxide fuel cells (SOFCs). It is demonstrated that the slurry spin coating method is capable of fabricating porous ceramic films by adjusting the content of ethyl-cellulose binders in the source slurry. The porous GDC layer deposited by spin coating under an optimal condition functions satisfactorily as a cathode-electrolyte interlayer in the test SOFC stack. A 2-μm-thick electrolyte membrane of the spin-coated YSZ/GDC bi-layer is successfully deposited as a dense and stable film directly on a porous NiO-YSZ anode support without any interlayers, and the SOFC produces power output over 200 mW cm<SUP>-2</SUP> at 600 <SUP>o</SUP>C, with an open circuit voltage close to 1 V. Electrochemical impedance spectra analysis is conducted to evaluate the performance of the fuel cell components in relation with the microstructure of the spin-coated layers.
Gd₂O₃-ZrO₂계 고체전해질의 미세구조와 전기전도도
임용무 광주보건대학 2000 論文集 Vol.25 No.-
The zirconia ceramics containing 3~5mol% GdO were sintered at 160℃ for 5h. With additions of less than 10mol% of gadolinia, the sintered zirconia consists of both cubic and monoclinic crystalline phases. During sintering of the zirconia, lots of cracks developed as is typical of non-stabilized zirconia ceramics. But the addition of 15mol% of GdO makes the zirconia stabilized as a cubic phase with lattice parameter a=5.168Å. By two-probe impedance spectroscopy, the Cole-Cole plot for the 15mol%GdO-ZrO measured at 600℃ showed two well separated semicircles. The resistivity of the grain, R and of the grainboundary, R was 148 and 215ohm?㎝, prspectively. The blocking factor a was 0.31. The total eletrical conductivity of 15mol%GdO-ZrO at 1000℃ was 0.15S/㎝, and the activation energy obtained from Arrhenius plot was 0.92eV.
Park, S.Y.,Ahn, J.H.,Jeong, C.W.,Na, C.W.,Song, R.H.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.24
Highly sinterable gadolinia doped ceria (GDC) powders are prepared by carbonate coprecipitation and applied to the GDC interlayer in Ni-YSZ (yttria stabilized zirconia)-supported tubular solid oxide fuel cell in order to prevent the reaction between YSZ electrolyte and LSCF (La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3-δ</SUB>) cathode materials. The formation of highly resistive phase at the YSZ/LSCF interface was effectively blocked by the low-temperature densification of GDC interlayer using carbonate-derived active GDC powders and the suppression of Sr diffusion toward YSZ electrolyte via GDC interlayer by tuning the heat-treatment temperature for cathode fabrication. The power density of the cell with the configuration of Ni-YSZ/YSZ/GDC/LSCF-GDC/LSCF was as high as 906 mW cm<SUP>-2</SUP>, which was 2.0 times higher than that (455 mW cm<SUP>-2</SUP>) of the cell with the configuration of Ni-YSZ/YSZ/LSM(La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>MnO<SUB>3-δ</SUB>)-YSZ/LSM at 750 <SUP>o</SUP>C.