Japan Fine Ceramics Research Association

Okazaki, Japan

Japan Fine Ceramics Research Association

Okazaki, Japan
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Hashimoto S.,Japan Central Research Institute of Electric Power Industry | Liu Y.,Japan Central Research Institute of Electric Power Industry | Asano K.,Japan Central Research Institute of Electric Power Industry | Yoshiba F.,Japan Central Research Institute of Electric Power Industry | And 4 more authors.
Journal of Fuel Cell Science and Technology | Year: 2011

A microtubular solid oxide fuel cell (SOFC) bundle was developed based on a new design. Anode-supported microtubular SOFCs with the cell configuration, La0.6 Sr0.4 Co0.2 Fe0.8 O 3 (LSCF)- Ce0.9 Gd0.1 O1.95 (CGO) cathode/CGO electrolyte/Ni-CGO anode were fabricated and bundled in a porous LSCF current-collecting cube with sides of 1 cm. The power generation of the fabricated SOFC bundle was measured under pressurized conditions. Using humidified 30% H2 / N2 mixture gas and air, the cubic power density of the bundle at 500°C under atmospheric pressure (0.1 MPa) was 0.47 W cm-3 at 0.4 A cm-2. With increasing operating pressure, the performance increased, and the cubic power density reached 0.66 W cm-3 at 0.6 MPa. The power enhancement brought about by pressurization was due to increased open circuit voltage and reduced polarization resistance. After comparing the power gain of the pressurized SOFC and the power consumption gain of the air compressor used for pressurization, it was found that pressurized cell operation exhibited the highest actual power gain at around 0.3 MPa. © 2011 American Society of Mechanical Engineers.


Liu Y.,CAS Shanghai Institute of Ceramics | Yasumoto K.,Japan Central Research Institute of Electric Power Industry | Hashimoto S.,Japan Central Research Institute of Electric Power Industry | Takei K.,Japan Central Research Institute of Electric Power Industry | And 5 more authors.
Journal of Fuel Cell Science and Technology | Year: 2010

In this work, a microtubular cell consisting of a thin Ce 0.9Gd0.1O1.95 (GDC) electrolyte (thickness: below 10 μm) on a support NiO/GDC anode (1.8 mm outer diameter, 200 μm wall thickness) with a La0.6Sr0.4Co0.2Fe 0.8O3-δ/GDC functional cathode has been developed for intermediate/low temperature operation. The functional cathode was prepared by in situ infiltrating the electrochemically catalytic nano-Ag particles into the as-established 20 μm thick cathode. The as-proposed Ag-impregnation route ensures a very homogeneous particle dispersion and a good adhesion of Ag to the ceramic matrices. The cells were successfully operated to produce the maximum power densities of 0.41 W cm-2 (1.27 A cm-2, 0.32 V), 0.83 W cm-2 (2.23 A cm-2, 0.37 V), and 1.05 W cm-2 (2.39 A cm-2, 0.44 V) at 450°C, 500°C, and 550°C, respectively. © 2010 American Society of Mechanical Engineers.


Funahashi Y.,Japan Fine Ceramics Research Association | Funahashi Y.,NGK Spark Plug Co. | Shimamori T.,NGK Spark Plug Co. | Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | And 2 more authors.
Journal of Fuel Cell Science and Technology | Year: 2010

Microtubular solid oxide fuel cells (SOFCs) are shown to be robust under rapid temperature changes and have large electrode area per volume (high volumetric power density). Such features are believed to increase a variety of application. Our study aims to establish a fabrication technique for microtubular SOFC bundles with the volumetric power density of 2 W cm -3 at 0.7 V. So far, we have succeeded to develop a fabrication technology for microtubular SOFC bundles using anode supported tubular SOFCs and cathode matrices with well-controlled microstructures. A key to improve the performance of the microtubular SOFC bundles is to optimize the microstructure of the cathode matrices because it influences a pressure loss for air and electric current collection. In this paper, a simulation study of an airflow, temperature, and potential distributions in the microtubular SOFC bundle was conducted in order to understand the characteristics of the present bundle design. In addition, operating conditions of the microtubular SOFC bundles was discussed for realizing the target power density of 2 W cm-3. Copyright© 2010 by ASME.


Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | Hasan Md.Z.,Japan National Institute of Advanced Industrial Science and Technology | Yamaguchi T.,Japan National Institute of Advanced Industrial Science and Technology | Fujishiro Y.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
Ceramic Engineering and Science Proceedings | Year: 2010

The feasibility of use of hydrocarbon fuel has been explored for micro tubular solid oxide fuel cells (SOFCs) consisted of Gd doped ceria (GDC) or Sc stabilized zirconia (ScSZ) electrolyte. Methane is selected for the fuel and directly supplied to the cell with water vapor. Performance of the cells with methane-water has been evaluated, and the GDC cell has showed the power density of 0.28 Wcm-2 at 600°C, while the ScSZ cell showed 0.45 Wcm -2 at 650°C furnace temperature. Both results are similar to the performance obtained with hydrogen fuel.


Yamaguchi T.,Japan National Institute of Advanced Industrial Science and Technology | Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | Fujishiro Y.,Japan National Institute of Advanced Industrial Science and Technology | Awano M.,Japan National Institute of Advanced Industrial Science and Technology | Shimizu S.,Japan Fine Ceramics Research Association
Journal of Fuel Cell Science and Technology | Year: 2010

We have developed a novel and highly effective electrode-supported solid oxide fuel cell (SOFC) with honeycomb structure for intermediate temperature operation. Honeycombsupported SOFC is known as one of the most compact SOFCs due to the large electrode area per unit volume, which is attractive with regard to space saving and cost reduction. In this study, we summarized the design of the channel shape, size, and sequence using numerical simulation and technologies to realize the designed honeycomb SOFC fabrication. The calculation results showed that the wall thickness and the channel size of the honeycomb had to be less than 0.22 mm and more than 0.3 mm, respectively, for the sufficient net channel surface and the acceptable pressure drop. Also, a cathodehoneycomb- supported SOFC can be the more efficient form with lower current collection resistance, as compared with the anode-supported type. The actual fabricated honeycomb SOFC exhibited a high volumetric power density above 1 W/cm 3 at 650 ° C under wet H2 fuel flow. © 2010 by ASME.


Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | Yamaguchi T.,Japan National Institute of Advanced Industrial Science and Technology | Fujishiro Y.,Japan National Institute of Advanced Industrial Science and Technology | Awano M.,Japan National Institute of Advanced Industrial Science and Technology | Funahashi Y.,Japan Fine Ceramics Research Association
Ceramic Transactions | Year: 2010

Micro tubular solid oxide fuel cells (SOFCs) were shown to have high thermal durability under quick start-up/ shut-down operation and to be operable at lower temperatures, and thus, it is expected to realize cost effective, compact and high performance power sources using them. In this study, two types (type A and B) of micro SOFC stacks were proposed and demonstrated using micro SOFC bundles, which consist of micro tubular SOFCs under 2 mm diameter and porous cathode matrices made of (La, Sr)(Co, Fe)O3. The type A was constructed using four bundles, vertically connected in series, and fuel and air were applied using ceramic manifolds. The type B consists of three bundles, horizontally connected in series, and fuel was applied using ceramic manifolds. The type A stack (volume 0.8 cm3) showed over 2 W and 3.65 V OCV at 490 °C, while the performance of the tyep B stack whose volume is 1 cm 3 was shown to be 2.8 V OCV and maximum power output of 1.5 W at 500 °C, applying air only by natural convection.


Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | Yamaguchi T.,Japan National Institute of Advanced Industrial Science and Technology | Fujishiro Y.,Japan National Institute of Advanced Industrial Science and Technology | Awano M.,Japan National Institute of Advanced Industrial Science and Technology | Funahashi Y.,Japan Fine Ceramics Research Association
Journal of Fuel Cell Science and Technology | Year: 2010

Ceramic reactors, which convert materials and energy electrochemically, are expected to solve various environmental problems, and the use of a microreactor design was shown to realize a high performance reactor with high thermal durability, operable at lower temperatures. Our research project, "Advanced Ceramic Reactor, "supported by the New Energy and Industrial Technology Development Organization, targets to develop new fabrication technology for such microreactors and modules using conventional, commercially available materials. In this study, fabrication technology of microtubular ceramic reactors have been investigated for aiming solid oxide fuel cell (SOFC) applications such as small distributed power generators, auxiliary power units for vehicles, and portable power sources. So far, microtubular SOFCs under a diameter of 1 mm using doped ceria electrolyte, and Ni-ceria based cermet for tubular support has been successfully developed and evaluated. The single microtubular SOFC showed a cell performance of 0.46 W/cm2 (at 0.7 V) at 550° C with H2fuel. The bundle design for such tubular cell was also proposed and fabricated. The discussion will cover the fabrication technology of a single tubular SOFC and bundle, and the optimization of the cell and bundle design by considering gas pressure loss and current collecting loss. © 2010 by ASME.


Sakuragi S.,Japan National Institute of Advanced Industrial Science and Technology | Funahashi Y.,Japan Fine Ceramics Research Association | Suzuki T.,Japan National Institute of Advanced Industrial Science and Technology | Fujishiro Y.,Japan National Institute of Advanced Industrial Science and Technology | Awano M.,Japan National Institute of Advanced Industrial Science and Technology
Journal of Fuel Cell Science and Technology | Year: 2010

Currently, microtubular solid oxide fuel cells (SOFC) bundles are under development, which consist of microtubular SOFCs (diameter = 0.8-2 mm) and porous cathode matrix where the SOFCs are integrated. In this study, a new fabrication process of the sealing layer for the microtubular SOFC bundles was examined using MgO-magnesium boro-silicate glass composites. A sheet and paste of these composites were prepared, and the microstructure and shrinkage behavior of the composite glass layers were investigated to minimize the deformation of the layer during fabrication process. The results indicated that using 100% glass sheet with the composite glass pastes appeared to be effective in reducing the shrinkage of the glass layer. In addition, the effect of sheet thickness on the shrinkage behavior was investigated and showed that the shrinkage ratio reduced as the sheet thickness decreased, and the shrinkage of about 0.2% was achieved at the sheet thickness of about 200 μm without defects or shape deformations. Thus, this fabrication method turned out to be effective for constructing a sealing layer for the microtubular SOFC bundles. Copyright © 2010 by ASME.


Fukuda S.,Japan Fine Ceramics Research Association | Shimada K.,Japan Fine Ceramics Research Association | Izu N.,Japan National Institute of Advanced Industrial Science and Technology | Shin W.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2015

The mechanical properties of metal conductor layers strongly influence the reliability of high-power electrical modules. In this study, the microstructure, elastic modulus, and residual stress during temperature cycling of screen-printed sintered paste films were evaluated to develop guidelines for designing metal conductor layers to the module. The number of pores decreased and the elastic modulus increased for paste films sintered at higher temperatures. These films deformed plastically at lower temperatures when heated from room temperature; those that had been sintered at the highest temperature of 800 °C showed the highest maximum compressive stress, which was still approximately one third smaller than that of copper electroplated films. All films developed creep deformation above 200 °C during both heating and cooling processes. The substrate under the film was considered to affect the residual stress in the elastic-deformation area owing to its coefficient of linear thermal expansion and to not affect the residual stress in the creep-deformation area. © 2015, Springer Science+Business Media New York.


Fukuda S.,Japan Fine Ceramics Research Association | Shimada K.,Japan Fine Ceramics Research Association | Izu N.,Japan Fine Ceramics Research Association | Shin W.,Japan Fine Ceramics Research Association | And 3 more authors.
Proceedings of the IEEE/CPMT International Electronics Manufacturing Technology (IEMT) Symposium | Year: 2015

Copper paste films develop creep deformation above 200 or 250 °C similar to copper sputtered and electroplated films. We evaluate the effects of copper particle size on the creep strain rate in the paste films. As the copper particle size changed, differences in the residual stress clearly appeared above 400 °C. For small particle sizes, the compressive stress reached 0 MPa faster during heating and the tensile stress increased more slowly during cooling above 400 °C. This result indicated that the creep strain rate of copper paste films became increased when the particle size decreased. © 2014 IEEE.

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