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    Effects of lamination conditions on the performance of anode-supported solid oxide fuel cells
    (Electrochemical Society Inc., 2015) Timurkutluk B.; Timurkutluk C.; Ciflik Y.; Korkmaz H.; Kaplan Y.
    Solid oxide fuel cells (SOFCs) operate at high temperatures and produce electricity and heat energy from fuels in an electrochemical way. Membrane electrode assembly (MEA) composed of a dense electrolyte coated with two porous electrodes on each side is generally constructed on the electrolyte. However, high operation temperatures are required to obtain acceptable performance values due to high electrolyte resistance as a result of the use of thick electrolyte layer as a mechanical support for MEA. Alternatively, the cells can be fabricated as anode-supported where the anode is responsible for supporting the cell mechanically. By doing so, the operation temperature can be lowered due to reduced electrolyte thickness. In this study, the effects of isostatic press parameters i.e. temperature and pressure for NiO/YSZ anode support on the anode-supported cell performance and the microstructure of the anode support are investigated. The experimental results reveal that the cell performance is strongly influenced by the pressing parameters. In this aspect, the optimum pressing temperature and pressure are found to be 50°C and 40 MPa, respectively. © The Electrochemical Society.
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    Glass fiber reinforced sealants for solid oxide fuel cells
    (Elsevier Ltd, 2019) Timurkutluk B.; Altan T.; Celik S.; Timurkutluk C.; Palacı Y.
    Novel sealants for solid oxide fuel cells are developed by addition of glass fiber into glass-ceramic as a reinforcement material. Various sealants including three different fiberglass types and four different structural designs are fabricated. The mechanical and sealing performances of the sealants are investigated via tensile and short stack leakage tests, respectively. The tensile tests reveal that the fracture strength of the sealants varies depending on the type and number of the glass fiber used. In general, the sealants having relatively high number of glass fiber layers exhibit relatively low joining strength. The best bonding strength values are obtained from the sealants having a structure where a single glass fiber layer is sandwiched between two glass-ceramic layers. The sealing performance tests are performed for the sealants showing the highest and lowest fracture strengths in the tensile tests as well as for the sealant without glass fiber addition as a base case for a comparison. The results indicate that it is possible to obtain a gas-tight sealing at high temperatures under all pressures studied, whereas leakage occurs at room temperature for all cases considered. However, the sealing performance is found to be related with the mechanical strength of the sealants. © 2019 Hydrogen Energy Publications LLC
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    Influence of sintering support design on the properties of NiO-YSZ anode support micro-tubes
    (Elsevier Ltd, 2018) Timurkutluk B.; Timurkutluk C.; Toros S.; Kaplan Y.
    The effects of the sintering support design on the microstructural and mechanical properties of NiO/YSZ anode support micro-tubes are investigated in this study. For this purpose, a number of micro-tubes of the same geometrical properties are fabricated via extrusion method from the same extrusion paste. The micro-tubes are then sintered at the same temperature on sintering plates with different C- and V-type sintering channels designed. The micro-tubes after sintering are found to have similar geometric properties. However, the microstructural investigations and three point bending tests indicate that the microstructural properties of the micro-tubes are strongly influenced by the sintering plate design. As a result, the flexural strength of the micro-tubes are found to be different. Among the cases considered, the micro-tubes of V2 (half of the micro-tube is initially in the V-type channel) and V4 (whole micro-tube is initially in the V-type channel) design provide relatively fine microstructure and thus relatively higher flexural strength values at a reliability of 80%. The flexural strengths of these micro-tubes are also found to be more consistent. © 2017 Elsevier Ltd and Techna Group S.r.l.