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Öğe A review on cell/stack designs for high performance solid oxide fuel cells(PERGAMON-ELSEVIER SCIENCE LTD, 2016) Timurkutluk, Bora; Timurkutluk, Cigdem; Mat, Mahmut D.; Kaplan, YukselBesides the general advantages of fuel cells, including clean and quiet operation, solid oxide fuel cells (SOFCs) as being one of the high-temperature fuel cells also provide a relatively high efficiency due to enhanced reaction kinetics at high operating temperatures, The high operation temperature of SOFC also enables internal reforming of most hydrocarbons and can tolerate small quantities of impurities in the fuel. However, a high operation temperature limits the SOFC application areas to stationary applications because of a long start-up period and also is not desirable from the viewpoint of cost reduction and longterm stability especially for the cell materials. Therefore, the lowering the operation temperature of SOFCs is crucial for the cost reduction and the long term operation without degradation as well as the commercialization of the SOFC systems. The reduced operating temperature also helps to reduce the time and to save the energy required for the system start-up enabling SOFCs to have wider application areas including mobile/portable ones. Apart from the low operating temperature, the high performance along with a small volume is another requirement for SOFC to be used in mobile applications. Both can be achieved by fabricating novel SOFCs generating a high power output at low operating temperatures. Therefore, this paper reviews the current status and related research on the development of these high performance-SOFC cell/stack designs. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Anode-supported solid oxide fuel cells with ion conductor infiltration(WILEY-BLACKWELL, 2011) Timurkutluk, Bora; Timurkutluk, Cigdem; Mat, Mahmut D.; Kaplan, YukselNano ion conductor infiltration to anode andcathode side of solid oxide fuel cell (SOFC) significantly improves the performance of an SOFC. The effects of processing parameters such as molar concentration, sintering temperature and holding time are investigated. The performance of fuel cell is evaluated with a test station and an impedance analyzer. The SEM investigation showed that a nano ion conductor phase forms around the main phase in the anode and the cathode. The results showed that nano infiltration enhances significantly the performance of SOFC. The power density is found to increase around two times with infiltration. It is also found that the particle size and the porosity significantly affect the performance of infiltrated SOFC cell. While smaller infiltrated grains enhance the performance lower porosity adversely affects the performance. Copyrightr (C) 2011 John Wiley & Sons, Ltd.Öğe Boosting the performance of bolt-microtubular solid oxide fuel cells through surface pattern tuning(Elsevier Sci Ltd, 2024) Onbilgin, Sezer; Altan, Tolga; Timurkutluk, Cigdem; Timurkutluk, BoraA number of bolt-microtubular anode supports (BMASs) are manufactured by winding the corresponding thin tapes on threaded rods of different thread pitches and depths, followed by co-lamination using isostatic press. Bolt-microtubular cells (BMCs) are also constructed on BMASs to investigate the effects of the created surface patterns on the cell performance and microstructure. The bolt-microtubular cell, whose anode support is patterned by using a threaded rod with 0.8 mm thread pitch and 0.4 mm thread depth, exhibits similar to 92% higher maximum performance than that of the reference cell at 800 degrees C under 0.3 NL/min hydrogen flow and stagnant air. The almost doubled performance is mainly due to the increase in anode-electrolyte and cathode-electrolyte interfacial areas by the surface patterns created. The cell is also subjected to a 200-h life test at 800 degrees C and 0.7 V and demonstrates a stable performance.Öğe Comparison of electrolyte fabrication techniques on the performance of anode supported solid oxide fuel cells(Pergamon-Elsevier Science Ltd, 2020) Onbilgin, Sezer; Timurkutluk, Bora; Timurkutluk, Cigdem; Celik, SelahattinA comparison of three solid oxide electrolyte fabrication processes, namely dip coating, screen printing and tape casting, for planar anode supported solid oxide fuel cells (SOFCs) is presented in this study. The effect of sintering temperature (1325-1400 degrees C) is also examined. The anode and cathode layers of the anode-supported cells, on the other hand, are fabricated by tape casting and screen printing, respectively. The quality of the electrolytes is evaluated via performance measurements, impedance analyses and micro structural investigations of the cells. It is found that the density of the electrolyte increases with the sintering temperatures for all fabrication methods studied. The results also show that with the process and fabrication parameters considered in this study, both dip coating and screen printing do not yield a desired dense electrolyte structure as proven by open circuit potentials measured and SEM photos. The cells with tape cast electrolytes, on the other hand, provide the highest performances regardless of the electrolyte sintering and cell operating temperatures. The best peak performance of 0.924 W/cm2 is obtained from the cell with tape cast electrolyte sintered at 1400 degrees C. SEM investigations and measured open circuit potentials reveal that almost fully dense electrolyte layer can be obtained with a tape cast electrolyte particularly sintered at temperatures higher than 1350 degrees C. Impedance analyses indicate that the main reason behind the significantly higher performances is due to not only increased electrolyte density but a decrease in the interface resistance of the anode functional and electrolyte layer is also responsible. This can be explained by theload applied during the lamination step in the fabrication of the tape cast electrolyte, providing better powder compaction and adhesion. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Design and optimization of functionally graded anode electrode with integrated functional layer for microtubular solid oxide fuel cells(Elsevier Sci Ltd, 2024) Timurkutluk, Cigdem; Altan, Tolga; Onbilgin, Sezer; Timurkutluk, BoraThis study investigates the influence of porosity-graded anode microstructures on the performance of microtubular solid oxide fuel cells (SOFCs). Fabricated using tape casting coupled with isostatic pressing, the anode microtubes consist of three layers with varying porosities. The porosity of each layer is regulated by the quantity of pore former added to the corresponding tape casting slurry. Homogeneous microtubular anode supports having different porosities are also fabricated similarly for comparison purposes. Microtubular cells are manufactured on both types of anodes by dip coating other cell layers, and test and characterization studies are carried out. Experimental results reveal that increasing the pore former content in the anode tape casting slurry leads to reduced triple phase boundary (TPB) density, primarily due to increased porosity and pore size, resulting in higher charge transfer resistance and decreased cell performance, despite an associated decrease in the gas transport resistance. However, optimization of the anode microstructure demonstrates that porosity gradients can enhance gas transport and overall cell performance. Additionally, the study explores the impact of anode thickness and the presence of transition layers on cell performance and structural integrity.Öğe Development of anodes for direct oxidation of methane fuel in solid oxide fuel cells(PERGAMON-ELSEVIER SCIENCE LTD, 2016) Akdeniz, Yelda; Timurkutluk, Bora; Timurkutluk, CigdemIn addition to pure hydrogen, solid oxide fuel cells (SOFCs) can utilize hydrocarbons as a fuel. However, conventional Ni-based anodes exhibit an excellent catalytic activity towards the hydrocarbon cracking reaction and thus the carbon deposition occurs in the anode. The deposited carbons quickly deactivate the anode irreversibly by covering the active surface of the anode catalyst. As a result, a significant degradation in the cell performance can be seen. In this study, the anode structure is modified by the addition of copper (Cu) and ceria (CeO2) to increase the coking resistance of the cell under direct methane fuel. In this respect, the anodes are infiltrated by different amounts of Cu and CeO2 nitrates via the wet impregnation technique to investigate the effects of Cu and CeO2 loadings on the carbon tolerance of the cell. The effects of the anode porosity and composition are also considered in the study. The carbon resistance thus the service life of the cell with Cu/CeO2/Ni/YSZ anodes is found to be significantly higher than that of conventional Ni-based anodes under direct dry methane fuel. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Development of ceramic fiber reinforced glass ceramic sealants for microtubular solid oxide fuel cells(Elsevier Sci Ltd, 2022) Timurkutluk, Cigdem; Toruntay, Furkan; Onbilgin, Sezer; Atalmis, Gamze; Timurkutluk, BoraCeramic fibers in various forms with different fiber sizes are tested to improve the sealing performance of glass ceramic seals for micmtubular solid oxide fuel cell applications. In this regard, several sealing pastes are prepared by mixing each ceramic fibers type with glass ceramics at 1.25 wt %. Five layered micmtubular anode supported cells are also fabricated by extrusion and dip coating methods to evaluate the sealing performance of the composite sealants. The pastes are applied between the cells and gas manifolds made of Crofer22 APU. The electrochemical and sealing performances at an operating temperature of 800 degrees C under hydrogen are investigated after the glass forming process. Microstructures of the sealants are also examined by a scanning electron microscope. Experimental investigations reveal that the cells sealed by the pastes with ceramic bulk fiber and ceramic fiber rope gasket show acceptable open circuit potentials close to the theoretical one. These cells can be also pressurized up to around 150 kPa back pressure in the sealing performance tests. On the other hand, the pastes without any filler, with ceramic rope and with ceramic blanket exhibit poor sealing performance due to gas leakage originated from flowing of the main glass ceramic matrix from the joints. Therefore, ceramic bulk fiber and ceramic fiber rope gasket are found to behave as a stopper and can be used to prevent glass ceramics from flowing for microtubular solid oxide fuel cells or similar applications.Öğe Development of functionally graded anode supports for microtubular solid oxide fuel cells by tape casting and isostatic pressing(Pergamon-Elsevier Science Ltd, 2023) Timurkutluk, CigdemThis paper suggests an alternative method to manufacture functionally graded anode supports for microtubular solid oxide fuel cells by employing tape casting and isostatic pressing for the first time in the literature. In this regard, six different anode support strips with various pore former contents are produced by tape casting. Besides the anode supports made from uniform tapes, three-layered anode supports composed of various combination of these tapes are also fabricated by wrapping the corresponding tape(s) of the same total length on a metallic rod followed by isostatic pressing. Microtubular cells are then built on these anode supports by dip coating the other layers and evaluated by microstructural investigations and electrochemical performance tests performed under the same conditions. Porosity measurements of the homogeneous anode supports are also carried out. Microstructural examinations reveal that not only the homogeneous anode supports but porosity graded anode supports can be also successfully manufactured by the suggested method. Electrochemical tests indicate that the performance of the cells with a uniform anode support tends to increase with the anode support porosity up to similar to 26% porosity then shows a decreasing trend. The highest maximum performance of 0.645 Wcm(-2) at 800 degrees C under 0.3 NLmin(-1) hydrogen and stationary air, on the other hand, is obtained from the cell with a porosity graded anode support.Öğe Development of high-performance anode supported solid oxide fuel cell(WILEY-BLACKWELL, 2012) Timurkutluk, Bora; Timurkutluk, Cigdem; Mat, Mahmut D.; Kaplan, YukselA high performance five-layered anode supported solid oxide fuel cell (SOFC) is developed by low-cost tape casting, co-sintering, and screen printing techniques. The cell is composed of NiO/scandium stabilized zirconia (ScSZ) anode support, NiO/ScSZ anode functional layer (AFL), ScSZ electrolyte, lanthanum strontium ferrite (LSF)/ScSZ cathode functional layer, and LSF cathode current collecting layer. The effects of fabrication parameters on the cell performance are investigated and optimized, including co-sintering temperature, thickness of the anode support, and AFL. The effects of GDC ion conducting phase impregnated into both electrodes also are investigated. The microstructure of the cell is observed using a scanning electron microscope, and the cell performances at various operation temperatures are evaluated by a fuel cell test station. The final cell produces 1.34 W.cm(-2) maximum power density at an operation temperature of 700 degrees C. The high performance is attributed to optimized cell structure as well as increase in the oxide ion conductivity and three-phase boundaries of both anode and cathode layers by nano ion conductor infiltration. Copyright (c) 2011 John Wiley & Sons, Ltd.Öğe Effect of Nano Ion Conductor Infiltration on the Performance of Anode Supported Solid Oxide Fuel Cells(ELECTROCHEMICAL SOC INC, 2009) Timurkutluk, Cigdem; Timurkutluk, Bora; Mat, Mahmut D.; Kaplan, Yuksel; Ibrahimoglu, Beycan; Pamuk, Ibrahim; Singhal, SC; Yokokawa, HA high performance anode supported solid oxide fuel cell (SOFC) is developed by low-cost tape casting, co-sintering and nano-ion conductor infiltration techniques. A mixture of gadolinium and cerium nitrate solution is infiltrated into both anode and cathode layers and fired at a temperature that gadolinium nitrate and cerium nitrate undergoes a solid state reaction and forms nano ion conductor phase in both electrodes. The effect of molar concentrations and firing temperature of nano ion conductor phase on the cell performance are investigated. The measurements show that nano-sized ion conductor infiltration significantly improves the cell performance. The cell provides 1.718 Wcm(-2) maximum power density at an operation temperature of 750 degrees C. The high performance is attributed to increase in the oxide ion conductivity and three phase boundaries of both anode and cathode layers by nano ion-conductor infiltration.Öğe Effect of reduced graphene oxide addition on cathode functional layer performance in solid oxide fuel cells(Pergamon-Elsevier Science Ltd, 2023) Timurkutluk, Cigdem; Zan, Recep; Timurkutluk, Bora; Toruntay, Furkan; Onbilgin, Sezer; Hasret, Onur; Altuntepe, AliSolid oxide fuel cells (SOFCs) operating at high temperatures are highly efficient electrochemical devices since they convert the chemical energy of a fuel directly into heat and electrical energy. The electrochemical performance of an SOFC is significantly influenced by the materials and microstructure of the electrodes since the electrochemical reactions in SOFCs take place at three/triple phase boundaries (TPBs) within the electrodes. In this study, graphene in the form of reduced graphene oxide (rGO) is added to cathode functional layer (CFL) to improve the cell performance by utilizing the high electrical properties of graphene. Various cells are prepared by varying the rGO content in CFL slurry (1-5 wt %), the number of screen printing (1-3) and the cathode sintering temperature (900-1100 degrees C). The electrochemical behavior of the cells is evaluated by electrochemical performance and impedance tests. It is observed that there is a similar to 26% increase in the peak performance of the cell coated with single layer CFL having 1 wt % graphene and 1050 degrees C sintering temperature, compared to that of the reference cell. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Effects of ceramic based pastes on electrochemical performance of solid oxide fuel cells(ELSEVIER SCI LTD, 2014) Mat, Abdullah; Timurkutluk, Bora; Timurkutluk, Cigdem; Kaplan, YukselVarious commercially available anode and cathode materials are investigated as the anode and cathode contact paste, respectively, for solid oxide fuel cells. In order to obtain a printable paste, chosen materials are mixed with an organic vehicle and a thinner as well as a pore former. The effect of the contact materials on the cell performance is evaluated experimentally via cell performance measurements by installing a short stack. The pastes are brush painted on the corresponding interconnector and current collecting mesh. A short stack without any contact paste is also tested for comparison as a base case. The impedance and microstructural analyses are also performed through an impedance analyzer and a scanning electron microscope, respectively. The effects of solid loading for two anode and two cathode contact paste materials which provide the best two performances during the electrochemical performance tests are also studied. After optimizing the solid loading in the anode and cathode contact paste according to the performance results, the best contact materials for each side are decided. The final short stack is then installed by using the best combination of contact pastes and then tested. The final cell shows 0.39 W cm(-2) and 0.90 W cm(-2) peak power densities at 700 degrees C and 800 degrees C, respectively, whereas the base cell provides only 0.26 W cm(-2) peak power density at 800 degrees C. The improvement in the cell performance is considered to be due to the enhanced contact and better current collecting by employing contact pastes. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.Öğe Effects of electrolyte pattern on mechanical and electrochemical properties of solid oxide fuel cells(ELSEVIER SCI LTD, 2012) Timurkutluk, Bora; Celik, Selahattin; Toros, Serkan; Timurkutluk, Cigdem; Mat, Mahmut D.; Kaplan, YukselIn order to enhance the electrochemical performance and reduce the operation temperature of a conventional electrolyte supported solid oxide fuel cell (SOFC), a three layered electrolyte with various geometry is designed and fabricated. Novel three layered electrolytes comprise a dense and thin scandia alumina stabilized zirconia (ScAlSZ) electrolyte layer sandwiched between two hallow ScAlSZ electrolyte layers each having the same thickness as the support but machined into a filter like architecture in the active region with circular, rectangular and triangular cut off patterns. The percent of thin electrolyte layer in the active region is kept constant as 30% for all designs in order to investigate the effect of pattern geometry on the mechanical properties and the performance of the electrolytes. Single cells based on novel electrolytes are manufactured and electrochemical properties are evaluated. A standard electrolyte and electrolyte supported cell are also fabricated as a base case for comparison. Although the electrolyte having triangular patterns has the highest peak power at all operation temperatures considered, it exhibits the lowest flexural strength. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.Öğe Effects of fabrication parameters on the performance of solid oxide electrolyzer cell(PERGAMON-ELSEVIER SCIENCE LTD, 2016) Korkmaz, Hatice; Timurkutluk, Bora; Timurkutluk, CigdemThe microstructure has a great impact on the performance of solid oxide fuel/electrolyzer cells while the cell fabrication parameters mainly determine the microstructure of the cell components. In this study, a number of five-layered cells with 16 cm(2) active area are fabricated and the effects of several cell fabrication parameters including sintering temperature and electrode composition on the hydrogen production performance are investigated. The experimental results showed that the optimum sintering temperature of the electrolyte, cathode and anode should be 1400 degrees C, 1250 degrees C and 1075 degrees C, respectively, while the solid weight ratio of both NiO-ScSZ cathode and LSM-ScSZ anode functional layer should be 1:1. The optimized cell produces 38 Sccm H-2 at an operation temperature of 800 degrees C and 1.5 V. Then, the cell size is increased to a commercial size of 81 cm(2) active area. The final cell exhibits an acceptable H-2 production of 154 Sccm H-2 at 800 degrees C and 1.5 V. The relatively lower performance of the commercial-size cell is attributed to the inadequate current distribution/collection due to the increased surface area. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Effects of tape thickness on the fabrication and performance of microtubular solid oxide fuel cells manufactured by tape casting(Pergamon-Elsevier Science Ltd, 2024) Altan, Tolga; Onbilgin, Sezer; Timurkutluk, Cigdem; Timurkutluk, BoraThe role of tape thickness in the fabrication of microtubular anode supports for solid oxide fuel cells (SOFCs) by tape casting and isostatic pressing is investigated in this study. The anode support slurry of the same formulation is tape cast by varying the doctor blade gap (DBG) from 100 mu m to 700 mu m and the obtained tapes are wrapped at different lengths on a metal pin of 5 mm in diameter, while the appropriate tape length for each DBG is decided by considering anode support microtubes with a similar geometry for a reasonable comparison. The analyses reveal that the microstructure of the anode support microtube varies depending on DBG and in general delamination and crack formations occur in the supports at high DBGs. The resultant porosity and pore/grain sizes are also found to be different depending on DBG. Therefore, the supports and the cells with these supports show different mechanical and electrochemical performances. In this regard, DBG of 300 mu m provides microtubular anode supports without any microstructural problems. The microtubular cell built on this support also exhibits the highest peak performance of 0.313 Wcm(-2) at an operating temperature of 800 degrees C under 300 sccm hydrogen flow and open cathode condition.Öğe Electrochemical behaviour and sulfur tolerance of VxMo(1-x)Oy as solid oxide fuel cell anode(ELSEVIER SCI LTD, 2013) Beyribey, Berceste; Timurkutluk, Bora; Ertugrul, Tugrul Y.; Timurkutluk, Cigdem; Mat, Mahmut D.Vanadium molybdenum oxide system (VxMo(1-x)Oy for x <= 0.13) is synthesized through reducing acidified vanadate and molybdate solution at 60 degrees C by passing hydrogen sulfide gas through the solution. The electrochemical performance of the mixed oxide is tested at various operation temperatures as an anode material for intermediate temperature solid oxide fuel cell (IT-SOFC) under pure and 50 ppm H2S-containing hydrogen fuel. The highest cell performance of 0.18 W cm(-2) peak power is reached at an operation temperature of 750 degrees C for dry H-2. It is found that the addition of 50 ppm H2S to the anode gas causes a 22% decrease in the cell peak power. The loss in the cell performance is attributed to both gas conversion and diffusion. Short-term regeneration tests indicate that 1 h-exposure to sulfur-free gas is insufficient for the reactivation of the cell performance. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.Öğe Experimental investigation on the effect of anode functional layer on the performance of anode supported micro-tubular SOFCs(Pergamon-Elsevier Science Ltd, 2022) Timurkutluk, Cigdem; Bilgil, Keremhan; Celen, Ali; Onbilgin, Sezer; Altan, Tolga; Aydin, UgurIn this study, anode supported micro-tubular solid oxide fuel cells (SOFCs) are fabricated by extrusion method and the effects of powder size, thickness and sintering temperature of the anode functional layer (AFL) on the electrochemical performance is experimentally investigated. For this purpose, four different commercial NiO powders are tested as initial powder for the fabrication of the anode functional layer. The thickness of AFL is also considered by varying the number of coatings. After deciding the optimum initial NiO powder size used in AFL and AFL thickness, the effect of pre-sintering temperature is examined. The performance tests are performed at an operating temperature of 800 degrees C under hydrogen and air. The microstructures of the samples are also investigated by a scanning electron microscope. The best peak power density is obtained as similar to 0.5 W/cm(2) from the cell having a single layer anode functional layer pre-sintered at 1250 degrees C prepared by NiO powders with 4 m(2)/g surface area. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Experimental optimization of the fabrication parameters for anode-supported micro-tubular solid oxide fuel cells(Pergamon-Elsevier Science Ltd, 2020) Timurkutluk, Cigdem; Timurkutluk, Bora; Kaplan, YukselA systematic optimization of several parameters significant in the fabrication of anode-supported micro-tubular solid oxide fuel cell via extrusion and dip coating is presented in this study. Co-sintering temperature of anode-support and electrolyte, the vehicle type and solid powder content used in electrolyte dip-coating slurry, electrolyte submersion time, cathode sintering temperature, powder ratio in the cathode functional layer, submersion time for the cathode functional layer and, submersion time and coating number of the anode functional layer are studied in this respect and optimized in the given order according to the performance tests and microstructural analyses. The performance of the micro-tubular cell is significantly improved to 0.49 Wcm(-2) at 800 degrees C after the optimizations, while that of the base cell is only 0.136 Wcm(-2). 12-cell micro-tubular stack is also constructed with the optimized cells and the stack is tested. Each cell in the stack is found to show very close performance to the single-cell performance and the stack with a maximum power of similar to 26 W at an operating temperature of 800 degrees C is therefore evaluated to be successful. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Fabrication and optimization of LSM infiltrated cathode electrode for anode supported microtubular solid oxide fuel cells(Pergamon-Elsevier Science Ltd, 2023) Timurkutluk, Cigdem; Yildirim, Fuat; Toruntay, Furkan; Onbilgin, Sezer; Yagiz, Mikail; Timurkutluk, BoraIn this study, anode supported microtubular solid oxide fuel cells (SOFCs) with LSM (lanthanum strontium manganite) catalyst infiltrated LSM-YSZ (yttria stabilized zirconia) cathodes are developed to increase the density of triple/three phase boundaries (TPBs) in the cathode, thereby to improve the cell performance. For this purpose, two different porous YSZ layers are formed on the dense YSZ electrolyte, i.e., one is with co-sintering while the other one is not. Incorporation of LSM into these porous YSZ layers is achieved via dip coating of a sol-gel based infiltration solution. The effects of the fabrication method for porous YSZ, LSM solution dwelling time and the thickness of the porous YSZ layer on the cell performance are experimentally investigated and optimized in the given order. A reference cell having a conventional dip coated cathode prepared by mixing the commercial LSM and YSZ powders is also fabricated for comparison. The results show that among the cases considered, the highest peak power density of 0.828 W/cm(2) can be obtained from the cell, whose single dip coated porous electrolyte layer co-sintered with the dense electrolyte is impregnated with LSM for a dwelling time of 45 min. On the other hand, the peak power density of the reference cell is measured as only 0.558 W/cm(2). These results reveal that similar to 50% increase in the maximum cell performance compared to that of the reference cell can be achieved by LSM infiltration after the optimizations. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Fabrication of glass ceramic sealants with ceramic fiber filler for solid oxide fuel cells(Elsevier Sci Ltd, 2022) Toruntay, Furkan; Atalmis, Gamze; Timurkutluk, Cigdem; Timurkutluk, BoraIn this study, ceramic fibers are used as a filler material for glass ceramic sealant in solid oxide fuel cells to improve the thermal cycle behavior. Beside the bare glass ceramic sealant for comparison, multilayered sealants with different ceramic fiber contents are fabricated to investigate the effect of ceramic fiber quantity also. The mechanical performances of the samples are measured via tensile tests by placing them between two metallic interconnector plates after the glass formation process as well as after 1, 5 and 10 thermal cycles. The results show that the mechanical strength in general tends to decrease with increasing the ceramic filler content, which can be attributed to poor adhesion due to reduced glass ceramic composition. On the other hand, thermal cycle behavior of the samples with ceramic fibers is found to be improved at some extend. This may be due to the behavior of ceramic filler network and relatively slow crystallization with increasing the amount of the filler as proven by microstructural observations. Especially for the sample including 4 ceramic fiber interlayers each having 0.030 g ceramic fibers, the mechanical strength shows an increasing trend with the number of thermal cycles.
