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Sanghoon Hyun - One of the best experts on this subject based on the ideXlab platform.
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fabrication and characterization of planar type sofc unit cells using the tape casting lamination co firing method
International Journal of Hydrogen Energy, 2012Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon HyunAbstract:Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ Functional Layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode Functional Layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode Functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.
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Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-firing method
International Journal of Hydrogen Energy, 2012Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon HyunAbstract:Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ Functional Layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode Functional Layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode Functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.
Moon Hwan - One of the best experts on this subject based on the ideXlab platform.
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fabrication and characterization of planar type sofc unit cells using the tape casting lamination co firing method
International Journal of Hydrogen Energy, 2012Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon HyunAbstract:Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ Functional Layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode Functional Layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode Functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.
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Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-firing method
International Journal of Hydrogen Energy, 2012Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon HyunAbstract:Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ Functional Layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode Functional Layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode Functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.
Joon Hyung Shim - One of the best experts on this subject based on the ideXlab platform.
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three dimensional thermal stress analysis of the re oxidized ni ysz anode Functional Layer in solid oxide fuel cells
Journal of Alloys and Compounds, 2018Co-Authors: Stefan Stenfelt, Fritz B Prinz, Joon Hyung ShimAbstract:Abstract Nickel-yttria-stabilized zirconia (Ni-YSZ) cermet is widely used as an anode material in solid oxide fuel cells (SOFCs); however, Ni re-oxidation causes critical problems due to volume expansion, which causes high thermal stress. We fabricated a Ni-YSZ anode Functional Layer (AFL), which is an essential component in high-performance SOFCs, and re-oxidized it to investigate the related three-dimensional (3D) microstructural and thermo-mechanical effects. A 3D model of the re-oxidized AFL was generated using focused ion beam-scanning electron microscope (FIB-SEM) tomography. Re-oxidation of the Ni phase caused significant volumetric expansion, which was confirmed via image analysis and calculation of the volume fraction, connectivity, and two-phase boundary density. Finite element analysis (FEA) with simulated heating to 500–900 °C confirmed that the thermal stress in re-oxidized Ni-YSZ is concentrated at the boundaries between YSZ and re-oxidized NiO (nickel oxide). NiO is subjected to more stress than YSZ. Stress exceeding the fracture stress of 8 mol% YSZ appears primarily at 800 °C or higher. The stress is also more severe near the electrolyte-anode boundary than in the Ni-YSZ cermet and the YSZ regions. This may be responsible for the electrolyte membrane delamination and fracture that are observed during high-temperature operation.
Qian Liming - One of the best experts on this subject based on the ideXlab platform.
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multiply super anti corrosion nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a multiply super anti -corrosion nickel plating - chromium part and manufacturing method, wherein multiply super anti -corrosion nickel plating - chromium part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, and the basal Layer, it is on the copper plate, and the Functional Layer, it is on the basal Layer, and wherein the Functional Layer includes electronegative potential nickel dam and the microporous nickel Layer on the electronegative potential nickel dam, and the decorative Layer, it is on the microporous nickel Layer, and the decorative Layer is the arbitrary of trivalent chromium cladding material or hexavalent chromium cladding material. The utility model discloses an on the surperficial micropore that provides of parts, chromium plating process basis, increase the electronegative potential nickel coating to the corrosion resisting property of corrosion resisting property, the especially trivalent chromium product of product is improved, the more large -scale popularization and application of trivalent chromium product of more environmental protection can be makeeed.
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nickel plating with or chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a nickel plating with or chromium part, this part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, the Functional Layer, it is on the copper plate, and wherein the Functional Layer includes electronegative potential nickel dam and the microporous nickel Layer on the electronegative potential nickel dam, and the decorative Layer is on its formation and the microporous nickel Layer. The utility model discloses a plate common microporous nickel Layer and the electronegative potential nickel dam that sets up in a top Layer to very big improvement holistic corrosion resistance of part and stability, can also have good bright planarization simultaneously, cladding material combines effectually.
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super anti corrosion nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model relates to a super anti-corrosion nickel plating -chromium part belongs to and electroplates technical field. It includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, with half light nickel dam, it is on the copper plate, with full gloss nickel dam or husky butyl's nickel dam, it is formed at half light nickel dam, and the Functional Layer, it is on full gloss nickel dam or husky butyl's nickel dam, and wherein the Functional Layer includes electronegative potential nickel dam and the microporous nickel Layer on the electronegative potential nickel dam, and the decorative Layer, it is on the microporous nickel Layer. Potential difference between electronegative potential nickel dam and the microporous nickel Layer is 10-120mv, the electronegative potential nickel dam in high-sulfur nickel dam, crazing line nickel dam the one deck or two-Layer between the complex, when adopting the crazing line with high-sulfur nickel composite plating, the potential difference is 10-80mv between crazing line and the high-sulfur nickel. The outward appearance of both having guaranteed part microporous nickel Layer is bright, makes it have super high corrosion resistance, hardness, wearability again.
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nickel chromium plating part and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention discloses a nickel-chromium plating part and a manufacturing method thereof. The nickel-chromium plating part includes a substrate, a pretreatment coating, a base Layer, a Functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plate Layer is formed on the pretreatment coating; the base Layer is formed on the copper plate Layer; the Functional Layer is formed on the base Layer and includes a low potential nickel Layer and a microporous nickel Layer formed on the low potential nickel Layer; and the decorative Layer is formed on the microporous nickel Layer and is a trivalent chromium coating or a hexavalent chromium coating. Based on the micropores on the part surface and chrome plating technology, the low potential nickel Layer is added to improve the corrosion resistance of the product, especially the corrosion resistance of trivalent chromium plating product, so as to promote the large scale popularization and application of the trivalent chromium product, which has better environmental protection performance.
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ultra corrosion resistant nickel chromium plating component and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention relates to an ultra-corrosion-resistant nickel-chromium plating component and a manufacturing method thereof, and belongs to the technical field of electroplating. The ultra-corrosion-resistant nickel-chromium plating component includes a substrate, a pretreatment coating, a half matt gloss nickel Layer, a full gloss nickel Layer or a satin nickel Layer, a Functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plating Layer is formed on the pretreatment coating; the half matt gloss nickel Layer is formed on the copper plating Layer; the full gloss nickel Layer or satin nickel Layer is formed on the half matt gloss nickel Layer; the Functional Layer is formed on the full gloss nickel Layer or satin nickel Layer, and the Functional Layer includes a low potential nickel Layer and a microporous nickel Layer formed on the low potential nickel Layer; and the decorative Layer is formed on the microporous nickel Layer. The potential difference between the low potential nickel Layer and the microporous nickel Layer is 10-120 mv; the low potential nickel Layer is a combination of one or two Layers of a high sulfur nickel Layer and a micro crack nickel Layer; when the micro crack and high sulfur nickel composite coating is employed, the potential difference between the micro crack nickel Layer and the high sulfur nickel Layer is 10-80 mv. The invention also discloses the manufacturing method of the ultra-corrosion-resistant nickel-chromium plating component. The method guarantees that the component not only has bright appearance of the micropore nickel Layer, but also has superhigh corrosion resistance, hardness and wear resistance.
Nigel Sammes - One of the best experts on this subject based on the ideXlab platform.
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a Functional Layer for direct use of hydrocarbon fuel in low temperature solid oxide fuel cells
Energy and Environmental Science, 2011Co-Authors: Toshio Suzuki, Toshiaki Yamaguchi, Koichi Hamamoto, Yoshinobu Fujishiro, Masanobu Awano, Nigel SammesAbstract:Solid-oxide fuel cells (SOFCs), which consist of ceramic components, directly convert the chemical energy of a fuel into electrical energy with the highest efficiency among various kinds of fuel cells. Because SOFCs are operated at high temperatures, typically in excess of 700 °C, direct use of hydrocarbon fuel becomes possible, which minimizes the system size as well as reducing the cost. It is, however, difficult to utilize direct reforming of hydrocarbon fuel when the operating temperature is below 600 °C, which is the target for intermediate temperature SOFCs. Here, we report a new concept of an SOFC utilizing a Functional Layer on the surface of an anode, for the direct reformation of a hydrocarbon fuel using a micro-tubular design. Preparation of the Functional Layer is cost-effective and the cell with a pure-ceria (CeO2) Functional Layer was successfully fabricated. The cell displays practical cell performance below 500 °C using methane–water mixture as the fuel gas, and shows enhanced performance compared to systems without a Functional Layer.
