Bibliografías temáticas / Low Temperture; Electrolyte; SOFC

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Literatura académica sobre el tema "Low Temperture; Electrolyte; SOFC"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 13 de febrero de 2022

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Artículos de revistas sobre el tema "Low Temperture; Electrolyte; SOFC"

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MARICLE, D., T. SWARR y S. KARAVOLIS. "Enhanced ceria — a low-temperature SOFC electrolyte". Solid State Ionics 52, n.º 1-3 (mayo de 1992): 173–82. http://dx.doi.org/10.1016/0167-2738(92)90103-v.

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Radhika, D. y A. S. Nesaraj. "Materials and Components for Low Temperature Solid Oxide Fuel Cells – an Overview". International Journal of Renewable Energy Development 2, n.º 2 (17 de junio de 2013): 87–95. http://dx.doi.org/10.14710/ijred.2.2.87-95.

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This article summarizes the recent advancements made in the area of materials and components for low temperature solid oxide fuel cells (LT-SOFCs). LT-SOFC is a new trend in SOFCtechnology since high temperature SOFC puts very high demands on the materials and too expensive to match marketability. The current status of the electrolyte and electrode materials used in SOFCs, their specific features and the need for utilizing them for LT-SOFC are presented precisely in this review article. The section on electrolytes gives an overview of zirconia, lanthanum gallate and ceria based materials. Also, this review article explains the application of different anode, cathode and interconnect materials used for SOFC systems. SOFC can result in better performance with the application of liquid fuels such methanol and ethanol. As a whole, this review article discusses the novel materials suitable for operation of SOFC systems especially for low temperature operation.
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3

Chen, Gang, Hailiang Liu, Yang He, Linlin Zhang, Muhammad Imran Asghar, Shujiang Geng y Peter D. Lund. "Electrochemical mechanisms of an advanced low-temperature fuel cell with a SrTiO3 electrolyte". Journal of Materials Chemistry A 7, n.º 16 (2019): 9638–45. http://dx.doi.org/10.1039/c9ta00499h.

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Agun, Linda, Hamimah Abd Rahman, Sufizar Ahmad y Andanastuti Muchtar. "Durability and Stability of LSCF Composite Cathode for Intermediate-Low Temperature of Solid Oxide Fuel Cell (IT-LT SOFC): Short Review". Advanced Materials Research 893 (febrero de 2014): 732–37. http://dx.doi.org/10.4028/www.scientific.net/amr.893.732.

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Solid oxide fuel cell (SOFC) is well known as power and heat generation device which converts chemical energy directly from fuel into electricity. SOFC operate at high temperature becomes obstacle for SOFC which reducing ionic conductivity material of current electrolyte, reduce lifetime of cell components, high fabrication cost, limited durability and performance issues. This introduce to environment pollution and decrease the SOFC lifetime. The fabrication of durability and stability composite cathode are comprised from mixing of perovskite La0.6Sr0.4CO0.2Fe0.8(LSCF) powders with nanoscale ionically conducting ceramic electrolyte materials, SDC-carbonate (SDCc) was overcome this problems. Powder preparation and composite cathode fabrication must consider which as main factors in the development of durability and stability of LSCF-SDCc composite cathode. Powders must in nanoscale to enhance the conductivity and decrease the interfacial polarization resistance and the composite cathode should in nanoporous morphology for achieve high power density over than 500 h and remarkable durability. Calcination also plays in important role and its operations will effects to the SOFC durability and performance. The necessary to prolong the lifetime and increase the SOFC performance has lead to development of durability and stability of SOFC. This paper reviews the durability and stability of the composite cathode and focus on the challenges in material technology.
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Gulicovski, Jelena, Snežana Nenadović, Ljiljana Kljajević, Miljana Mirković, Marija Nišavić, Milan Kragović y Marija Stojmenović. "Geopolymer/CeO2 as Solid Electrolyte for IT-SOFC". Polymers 12, n.º 1 (20 de enero de 2020): 248. http://dx.doi.org/10.3390/polym12010248.

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As a material for application in the life sciences, a new composite material, geopolymer/CeO2 (GP_CeO2), was synthesized as a potential low-cost solid electrolyte for application in solid oxide fuel cells operating in intermediate temperature (IT-SOFC). The new materials were obtained from alkali-activated metakaolin (calcined clay) in the presence of CeO2 powders (x = 10%). Besides the commercial CeO2 powder, as a source of ceria, two differently synthesized CeO2 powders also were used: CeO2 synthesized by modified glycine nitrate procedure (MGNP) and self-propagating reaction at room temperature (SPRT). The structural, morphological, and electrical properties of pure and GP_CeO2-type samples were investigated by X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR), BET, differential thermal and thermogravimetric analysis (DTA/TGA), scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), and method complex impedance (EIS). XRPD and matrix-assisted laser desorption and ionization time-of-flight (MALDI-TOF) analysis confirmed the formation of solid phase CeO2. The BET, DTA/TGA, FE-SEM, and EDS results indicated that particles of CeO2 were stabile interconnected and form a continuous conductive path, which was confirmed by the EIS method. The highest conductivity of 1.86 × 10−2 Ω−1 cm−1 was obtained for the sample GP_CeO2_MGNP at 700 °C. The corresponding value of activation energy for conductivity was 0.26 eV in the temperature range 500–700 °C.
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Chen, Gang, Yadan Luo, Wenkang Sun, Hailiang Liu, Yushi Ding, Ying Li, Shujiang Geng, Kai Yu y Guoqiang Liu. "Electrochemical performance of a new structured low temperature SOFC with BZY electrolyte". International Journal of Hydrogen Energy 43, n.º 28 (julio de 2018): 12765–72. http://dx.doi.org/10.1016/j.ijhydene.2018.04.006.

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Chen, Gang, Xuebai Zhang, Yadan Luo, Yang He, Hailiang Liu, Shujiang Geng, Kai Yu y Yu Dong. "Ionic conduction mechanism of a nanostructured BCY electrolyte for low-temperature SOFC". International Journal of Hydrogen Energy 45, n.º 45 (septiembre de 2020): 24108–15. http://dx.doi.org/10.1016/j.ijhydene.2019.07.223.

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Ricca, Chiara, Andrey Grishin, Armelle Ringuedé, Michel Cassir, Carlo Adamo y Frédéric Labat. "Modeling composite electrolytes for low-temperature solid oxide fuel cell application: structural, vibrational and electronic features of carbonate–oxide interfaces". Journal of Materials Chemistry A 4, n.º 44 (2016): 17473–82. http://dx.doi.org/10.1039/c6ta06827h.

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Han, Min Fang, Zhi Bin Yang, Ze Liu y Hui Rong Le. "Fabrication and Characterizations of YSZ Electrolyte Films for SOFC". Key Engineering Materials 434-435 (marzo de 2010): 705–9. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.705.

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Yttria stabilized zirconia (YSZ) has been widely used as electrolyte in solid oxide fuel cell (SOFC). The effect of fabrication process on the properties of YSZ electrolyte thick film is discussed in the paper. With YSZ nano-powders of about 20-60nm as raw material, YSZ green adobe was fabricated by tape calendering process. Three-step sintering process was performed firstly holding at 1000°C for 2h, then raising to 1300~1400°C, then decreasing to 1200~1300°C within 30 minutes, and finally calcining at 1200~1300°C for 5~20 hrs. Dense YSZs with relative density of 96-99% are obtained; the grain size of YSZ was reduced to 0.5-3µm. During the process of grain growth, there are both grain boundary diffusion and grain boundary migration. The feasibility of densification without grain growth relies on the suppression of grain boundary migration while keeping grain boundary diffusion active at a temperature as low as 1200~1300°C. Whereas the electric conductivities of the YSZs are even higher than that obtained in conventional single step sintering process. The process is applied to the anode-supported SOFCs co-fired at 1250~1300°C, and the cathode-supported SOFCs co-fired at 1200~1250°C.
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Oh, Seongkook, Joonsuk Park, Jeong Woo Shin, Byung Chan Yang, Jiaming Zhang, Dong Young Jang y Jihwan An. "High performance low-temperature solid oxide fuel cells with atomic layer deposited-yttria stabilized zirconia embedded thin film electrolyte". Journal of Materials Chemistry A 6, n.º 17 (2018): 7401–8. http://dx.doi.org/10.1039/c7ta10678e.

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Tesis sobre el tema "Low Temperture; Electrolyte; SOFC"

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Tang, Shijie. "Development of Multiphase Oxygen-ion Conducting Electrolytes for Low Temperature Solid Oxide Fuel Cells". Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_theses/112.

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One of the major trends of development of solid oxide fuel cells is to reduce the operating temperature from the high temperature range (>950°C) and intermediate temperature range (750-850°C) to the low temperature range (450-650°C). Development of low temperature oxygen ion conducting electrolytes is focused on single-phase materials including Bi2O3 and CeO2-based oxides. These materials have high ion conductivity at the low temperature range, but they are unstable in reducing environments and they are also electronic conductors. In the present research, three types of multiphase materials, Ce0.887Y0.113O1.9435 (CYO)-ZrO2, CYO- yttria-stabilized zirconia (YSZ), and CuO-CYO were investigated. We found that the conductivity of multiphase electrolyte CuO-CYO with a mass ratio of 1:3 is at least 4 times greater than that of CYO and 10 times greater than that of YSZ, the most commonly used material, obtained in the present experiments at 600°C. The enhancement of conductivity in multiphase materials correlates with the level of mismatch between the two phases. Large mismatches in terms of valance and structure result in high vacancy density and hence high oxygen ion conductivity at grain boundaries. This study demonstrates that synthesis of multiphase ceramic materials is a feasible new avenue for development of oxygen ion electrolyte material for low temperature SOFCs.
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2

Yao-Ming-Wang y 王耀明. "Low-Temperature Preparing Multi-Doping CeO2 Based Electrolyte of IT-SOFC and Thus Characterization". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/25580048076419935337.

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碩士
國立臺灣海洋大學
輪機工程系
97
The aim of this study is to develop ceria-based solid electrolyte with high ionic conductivity for intermediate temperature（400-800℃）SOFC instead of conventional YSZ electrolyte. YSZ electrolyte shows very low ionic conductivity during operation at 400-800�aC. CeO2 materials doped with the di- or tri-valent metals possess high oxygen ionic conductivity for potential electrolyte use in intermediate temperature solid oxide fuel cell (SOFC). However, multi-elemments doped CeO2-based electrolyte, (La1-x-ySrxBay)0.175Ce0.825O2-d (LSBC) in this work, with pure phase is difficultly synthesized at low calcination temperature. High sintering temperature, e.g., > 1500℃, is also needed in conventional mixed oxide method to obtain pure fluorite structure and high density. In this work, nanoparticles less than 50nm of LSBC can be prepared by solution-evaporation method (SV) at constant temperature. Pure fluorite crystal structure can be obtained as low as 600℃. The optimal mole ratio of LSBC/citric acid in prepared solution is 1/2 to achieve homogeneous composition and pure phase of LSBC. The sintering densification temperature of 1300�aC for LSBC prepared by solution-evaporation method is far lower than the 1500�aC by mixed oxide method. The ionic conductivity of 1400�aC-MW sintered LSBC prepared by solution-evaporation method is about 0.01 S/cm at 600�aC. The relative density of microwave sintering reaches up to 98%. Small grain size of about 1�慆 average is observed for 1400�aC sintered LSBC by solution-evaporation method.
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3

Huang, Kuo-chih y 黃國志. "Synthesis and Electrochemical Properties of Ce0.8Bi0.2-xMxO1.9 (M=Sm、Er、Dy) Prepared by a Low Temperature Hydrothermal Method for SOFC Electrolyte". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23900559735266808378.

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碩士
國立臺灣科技大學
化學工程系
96
The aim of this study is to develop a low temperature hydrothermal method in synthesizing Ce0.8Bi0.2-xMxO1.9(M=Sm,Er,Dy) solid electrolytes, which is operating at intermediate temperatures (500 ℃-700 ℃) for solid oxide fuel cells (SOFC). The traditional YSZ-based solid electrolytes show very low ionic conductivities during this temperature range and research on the development of solid electrolytes alternative to YSZ is of great importance. The corresponding crystal structure, oxide ion vacancies, conductivity, and activation energy after dopants are thoroughly studied and discussed. Among the various dopants studied, Ce0.8Bi0.05Sm0.15O1.9 exhibited the highest conductivity of about 5.21×10-2 Scm-1 at 700 ℃ and the activation energy is found to be 0.6891 eV. By AC-Impedence, the improvement in ionic conductivity of ceria-based solid electrolyte (conductivity of pure ceria oxide at 900 ℃ is 7.37×10-4 Scm-1) with the amount of doping metal ion with different charges can be reasonably understood. We also investigated the variations in conductivity caused by oxide ion vacancies. With Raman scattering spectrum, we analyzed Ce0.8Bi0.05Sm0.15O1.9 at different sintering temperatures. From the results obtained from various analysis techniques, we found that 1300 ℃ is the best sintering temperature. The Ce0.8Bi0.05Sm0.15O1.9 sintered at 1300 ℃ exhibited promising density, oxide ion vacancies and conductivity. Our future interest is to fabricate thin electrolyte film on the anode-supported intermediate temperature SOFC by electrophoresis deposition (EPD) method. As the charge of particle is an important factor which determines the efficacy of EPD process, herein we study the reaction mechanism of EPD. After following UV/Vis, FTIR, Raman, NMR during EPD process, we developed the reaction mechanism. As iodine is added into the organic solvent, the pH value of solution will increase gradually. During the course of reaction I- and I3- are formed. However, at the end of the reaction, there is only I- in the solution. These results indicate that both the pH and formation of I3- are dependent on the time of reaction between iodine and organic solvent.
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4

Huang, Ding-Han y 黃鼎翰. "Synthesis and Electrochemical Properties of Sm-doped and Bi-doped Cerium Oxides Prepared by a Low Temperature Hydrothermal Method for SOFC Electrolyte". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/66209454697627893594.

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碩士
國立臺灣科技大學
材料科技研究所
92
The aim of this study was to develop ceria-based solid electrolytes with high ionic conductivity for intermediate temperature（500-700℃） SOFC instead of conventional YSZ electrolytes showing very low ionic conductivity during this temperature range. Ceria-based materials showed potential application in intermediate temperature due to higher ionic conductivities. Further, the thermal expansion coefficients (TEC, about 12.5×10-6K-1) of the ceria-based materials are close to cobalt-based perovskite materials, which are commonly used as cathode materials. A urea-based low temperature hydrothermal route with low cost and involving simple procedures was developed in this study. The nano-sized Ce0.8Sm0.2O1.9 and Ce1-xBixO2-x/2（X = 0.1~0.5） powders with pure phase were synthesized successfully at 105℃ and 1 atm. To characterize the ionic conductivities, the synthesized powders were cleaned, molded and sintered to electrolyte disks. Pt paste was then screen-printed onto both sides of the electrolyte disks to prepare working and counter electrodes. The electrolyte disk sintered at 1400℃ for 5hr from the Ce0.8Sm0.2O1.9 powder synthesized with urea concentration of 1.4M show the best ionic conductivity which was around 1.355×10-2Scm-1 at 630℃in air. The formation mechanism of the developed low temperature hydrothermal route was investigated to provide a better understanding of the process which could be applied in the synthesis of new materials. Combining with data obtained from various analysis techniques, the formation mechanism was proposed as follows： CeO2-CeO2-x(OH)2-x precipitates were formed initially. After raising the temperature, the dehydration of the precipitates and the decomposition of the dissolved urea molecules took place resulting in increasing the pH of the mixed solution. CeO2-CeO2-x(OH)2-x was transformed to pure cubic fluorite nanocrystalline CeO2 which can be used as nucleus for the precipitates of Sm(OH)3. Amorphous Sm(OH)3 precipitates were then deposited onto the surface of the nanocrystalline CeO2 powders. Further aging the solution at hydrothermal conditions, the deposited Sm(OH)3 precipitates were suggested to diffuse into CeO2 matrix to form Ce0.8Sm0.2O1.9 particles with pure phase.
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Capítulos de libros sobre el tema "Low Temperture; Electrolyte; SOFC"

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Fuierer, Paul, Kevin Ring, Joerg Exner y Ralf Moos. "BICU(TI)VOX as a Low/Intermediate Temperature SOFC Electrolyte: Another Look". En Ceramic Transactions Series, 29–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119234531.ch3.

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Actas de conferencias sobre el tema "Low Temperture; Electrolyte; SOFC"

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Bonneau, M., F. Gitzhofer y M. Boulos. "SOFC/CeO2 Doped Electrolyte Deposition Using Suspension Plasma Spraying". En ITSC 2000, editado por Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0929.

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Abstract Ceria (CeO2) based electrolytes have been considered for use in solid oxide fuel cells (SOFC) for more than 20 years. There are however some limitations to this usage that this study has tried to address, indeed the study objective has been that of synthesizing and thermal spraying thin layers (50 - 100 µm) of doped CeO2 by the technique of suspension plasma spraying, using radio frequency (RF) plasma technology. Various dopant combinations and concentrations have been selected for this work in order to increase the useful partial oxygen pressure range for satisfactory ionic conductivity development, thereby increasing the anionic conductivity and preventing CeO2 reduction in fuel cell service. Ceria possesses the fluorite crystal structure at low temperatures but does not have enough oxygen vacancies to be a good ionic conductor. In ceria the cerium have 4+ oxidation state within the fluorite structure, and by substituting a certain amount of Ce4+ ions by trivalent dopant ions, oxygen vacancies are induced into the structure. Recent studies have demonstrated that at low temperatures doped ceria seems to be a better electrolyte than doped zirconia. Also, it seems that dopants with ionic radii close to Ce4+ ions give rise to better ionic conductivities. The doped ceria conductivity increases with the dopant concentration because more oxygen vacancies are created, but at higher concentrations vacancy ordering occurs which results in decreased ionic conductivity.
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2

Chang, Horng-Yi y Yao-Ming Wang. "Low-Temperature Prepared Multi-Elements Doped CeO2 Electrolyte". En ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85221.

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CeO2 materials doped with the di- or tri-valent metals possess high oxide ionic conductivity at low temperature for potential electrolyte use in intermediate temperature solid oxide fuel cell (SOFC). However, multi-elements doped CeO2-based electrolyte, (La1-x-ySrxBay)0.175Ce0.825O2-δ (LSBC) in this work, with pure phase is difficultly synthesized at low calcination temperature. High sintering temperature, e.g. > 1500°C, is also needed in conventional mixed oxide method. In this work, nanoparticles less than 50nm of LSBC can be prepared by solution-evaporation method at constant temperature. Pure fluorite crystal structure can be obtained lower than 700°C. The optimal mole ratio of LSBC/citric acid in prepared solution is 1/2 to achieve homogeneous composition and pure phase of LSBC. Small grain size of about 1μm average is observed for 1300°C-microwave sintered LSBC by solution-evaporation method. The ionic conductivity of 1400°C-conventional sintered and 1300°C-microwave sintered LSBC prepared by solution-evaporation method is about 0.006 S/cm at 600°C but less than 0.004 S/cm at 600°C even for 1500°C-conventional sintered LSBC prepared by mixed oxide method.
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3

Menzer, Sophie, Grover Coors, Dustin Beeaff y Dan Storjohann. "Development of Low-Cost Anode Material for Solid Oxide Fuel Cells". En ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65099.

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Manufacturing cost remains one of the major issues facing the solid oxide fuel cell (SOFC) industry. In the anode supported SOFC design, the cermet anode constitutes around 90% of the total material required to build a cell, making the technology very sensitive to anode raw material price. A new patent-pending process called “nickel yttria reaction-sintered zirconia (NiYRSZ)” has been developed for manufacturing SOFC anodes at a fraction of the cost. Typically, the solid component of the anode consists of about 50/50 volume percent nickel and 8 mole percent yttria stabilized zirconia, the latter being a rather costly material. It was discovered that zirconia and yttria powders sintered in the presence of nickel oxide readily form the cubic phase at moderate temperature. Cells manufactured using this process show excellent microstructures for anode supports: a strong bond between the electrolyte and the anode, and a high porosity without addition of pore formers. The strength of the anode was 100 MPa making the material equivalent or slightly superior to an anode fabricated with the traditional NiO/8YSZ material of similar porosity. The resistivity of the material was measured at 850°C and found to be less than 2 mΩ·cm. Cell performance was also compared to cells manufactured with traditional material. Every indication is that SOFC anodes fabricated with this new method perform as well as anodes made with the conventional material set.
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Iguchi, Fumitada, Noriko Sata y Yugami Hiroo. "Electrode Reaction and Cell Performances of IT-SOFC Using BaZrO3 Proton Conductors". En ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65205.

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This paper evaluates cell performances and electrode reaction of an electrolyte supported type cell using 15mol% Y-doped BaZrO3 perovskite type proton conductors. BaZrO3 based proton conductors show high proton conductivity and chemical stability in IT-SOFC operating atmospheres. But, because of low sintering properties, there is little knowledge about electrolyte performance, e.g., open circuit voltage, electrode over potential. Through SOFC generation test, it is confirmed that cell performance of the cell is determined by electrode over potential. Electrode over potential is significantly higher than similar configuration cell using BaCeO3 based proton conductors. Those results suggests that study of differences in electrode reaction between BaCeO3 based proton conductors and BaZrO3 based proton conductors will be necessary.
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Ju, Gang y Kenneth Reifsnider. "Creep Behavior Analysis for a Bilayer Functional Graded Electrolyte Supported High Temperature Ceramic Fuel Cells". En ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13875.

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Ceramic fuel cell, such as solid oxide fuel cell (SOFC), usually has three functional layers with one dense electrolyte in the middle and two porous electrodes on each side of it, which operates around 1000°C. Recent research activities in SOFC tend to lower the operation temperature to the range of 700°C-800°C due to improvement in mechanical properties, and reduction in costs. However, the state-of-the-art electrolyte yttria-stabilized zirconia (YSZ) under this reduced temperature produces relatively poor ionic conductivity. Ceria-based electrolyte is an excellent candidate in electrical properties under intermediate temperature range, even though it shows a lattice expansion by cerium reduction at the very low oxygen partial pressure occurring at the anode side. Hence, a bilayer yttria doped ceria (YDC) with thin YSZ protection at anode side is designed to maximize the ionic conductivity. However, this lattice expansion of cerium results in an internal stress under this SOFC consideration. In this paper, oxygen partial pressure dependent creep behavior of an edge crack at the bi-material interface (YSZ:YDC) is studied numerically. The steady state C* path independent integral is obtained from ABAQUS code. Bi-material and homogeneous cases are discussed under extensive creep. Finally, fracture analysis of an edge crack at the bilayer electrolyte is also investigated for homogeneous bilayer materials.
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Chen, H. C., J. Heberlein y T. Yoshida. "Preparation of Films for Solid Oxide Fuel Cells by Center-Injection Low Pressure Plasma Spraying". En ITSC 1998, editado por Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1309.

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Abstract A new plasma spray process was developed for the rapid deposition of very dense electrolyte layers for solid oxide fuel cells (SOFCs). The dense yttria-stabilized zirconia (YSZ) film was prepared by a center-injection low pressure plasma spraying (CI-VPS) process on various substrates in a triple-torch reactor. For deposition on porous substrates, an intermediate layer was applied using conventional atmospheric plasma spraying (APS) to close the large pores in the substrate. The films were characterized by XRD, SEM, and EMPA. The porosity of the film was analyzed by computerized image analysis of the micrographs. The film was also fractured by four-point bending to characterize the nature of bonding of layer-to-layer and within the deposit. The film analysis showed that YSZ layers with porosities of 0.3 % could be obtained at very high deposition rates with the CI-VPS process, with a very good functional performance of the layer as an electrolyte. Building of a complete SOFC by successive deposition of an atmospheric pressure sprayed porous cermet film, the dense YSZ electrolyte layer, and a porous perovskite film is discussed.
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Maric, Radenka, Roberto Neagu, Ye Zhang-Steenwinkel, Frans P. F. van Berkel y Bert Rietveld. "Flame Deposition of the Electrolyte and Cathode for High and Stable Performance of Low-Temperature SOFCs". En ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33342.

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The key obstacles to the development of low operating temperature (LT) SOFCs are high ohmic resistance and high electrode overpotentials. In the present work, we demonstrate excellent cell performance at 600 °C on a anode supported bi-layer electrolyte SOFC having a thin RSDT-made cerium gadolinium oxide (Gd0.2Ce0.8O2−δ, CGO) and a lanthanum strontium cobaltite (La0.6Sr0.4CoO3−δ, LSC) perovskite cathode. The measured ohmic resistance of the ASE cell with CGO layer deposited by RSDT was 0.24 ohm.cm2, which is close to the expected theoretical value of 0.17 ohm.cm2 for a 5 micron thick 8YSZ electrolyte at 600 °C. This indicates that the obtained peak power output density is approaching what is theoretically possible. This work is based on the lab scale use of Reactive Spray Deposition Technology (RSDT) which is an open atmosphere, cost efficient technique that does not require high vapor precursors and is an effective way to deposit thin ceramic layers of YSZ/CGO/LSC onto Ni-YSZ substrates. It has the potential to chain successive coating steps thus, significantly simplifying the production of multilayered ceramic structures as the SOFCs and reducing the cost associated with manufacturing of the cells.
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Sakamoto, Yusuke, Naoki Shikazono y Nobuhide Kasagi. "Effects of Electrode Microstructure on Polarization Characteristics of SOFC Anodes". En ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65079.

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Anode microstructure parameters were quantified by SEM-EDX measurements and the dependence of polarization characteristics on the anode microstructure parameters is investigated experimentally. Nickel yttria-stabilized zirconia (Ni-YSZ) anode supported cells with a thin YSZ electrolyte, lanthanum-strontium-manganite (LSM)-YSZ composite cathode, and LSM cathode current collector layers were fabricated by dip coating method. Anode microstructure was successfully imaged and quantified by ultra low voltage SEM and by means of stereology. Cell voltage measurements and impedance spectroscopy were performed at 650 and 750°C with hydrogen diluted by nitrogen as a fuel. A quantitative relationship between measured polarization and microstructure parameters, e.g., three phase boundary length, contiguity, etc., was discussed. Finally, a cell with an anode functional layer (AFL) was fabricated to investigate the possibility of improving both activation and concentration polarization characteristics.
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9

Huang, Jianbing, Zongqiang Mao, Bin Zhu, Lizhai Yang, Ranran Peng y Ruifeng Gao. "Direct Preparation of Ce0.8Sm0.2O1.9 Powders Oxidized With H2O2 for Low Temperature SOFCs Application". En ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74027.

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A novel method was developed to prepare fine doped ceria (DCO) powders directly. Ceria doped with 20 mol. % of samarium (Ce0.8Sm0.2O1.9, SDC) was prepared by in-situ oxidization of hydroxide precipitates with H2O2 in the solutions. The resultant powder desiccated at 85°C overnight was characterized by X-ray diffraction (XRD), thermogravimetry /differential thermal analysis (TG/DTA), and transmission electron microscopy (TEM). The XRD pattern showed that the as-dried SDC powder is single phase with a cubic fluorite structure like that of pure CeO2. An anode-supported SOFC was also fabricated based on SDC and 20wt. % (62mol. %Li2CO3–38 mol. %K2CO3) composite electrolyte, LiNiO2 as cathode and NiO as anode, by cold pressing. Using hydrogen as the fuel and air as the oxidant, the I-V and I-P characteristics exhibit excellent performances and the maximum power densities are about 696, 469, 377 and 240 mWcm−2 at 650, 600, 550 and 500°C, respectively.
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10

Iguchi, Fumitada, Hiromichi Kitahara y Hiroo Yugami. "High Temperature Mechanical Properties of Ni-YSZ Cermets for SOFC Anode". En ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33280.

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The mechanical properties of Ni-YSZ cermets at high temperature in reduction atmosphere were evaluated by the four points bending method. We studied the influences of reduction and thermal cycles, i.e. a cycle from R.T. to 800°C, to flexural strength and Young’s modulus. The flexural strength of Ni-YSZ at room temperature was lower than that of NiO-YSZ by about 10 to 20% mainly caused by the increment of porosity. But, the flexural strength of Ni-YSZ at 800°C was drastically decreased by an half of that at R.T. In addition, the stress–strain diagram of Ni-YSZ at 800°C indicated that it showed weak ductility. The maximum observed strain was over 0.5% at 30MPa. On the contrary, NiO-YSZ showed only brittlely at 800°C. The difference was caused by Ni metal in the Ni-YSZ cermets. Therefore, it was expected that Ni-YSZ is easily deformed in operation, though residual stress between an anode and an electrolyte was low. The influence of thermal cycles to flexural strength and Young’s modulus was not observed clearly. At the same time, the differences of microstructure were not observed. Therefore, it was concluded that the cycle does not change mechanical properties significantly.
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Informes sobre el tema "Low Temperture; Electrolyte; SOFC"

1

Vesely, Charles, Paul Barnard y Bal Dosanjh. Metal-Supported Ceria Electrolyte-based SOFC Stack for Scalable, Low‐Cost, High‐Efficiency and Robust Stationary Power Systems. Office of Scientific and Technical Information (OSTI), marzo de 2021. http://dx.doi.org/10.2172/1772925.

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