Seiichi Suda

Shizuoka University

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Koichi Kawahara

Osaka Institute of Technology

Takao Umegaki

Tokyo Metropolitan University

Kiyoshi Kanamura

Tokyo Metropolitan University

Mitsunobu Kawano

Kansai Electric Power (Japan)

Toru Inagaki

Kansai Electric Power (Japan)

Hiroyuki Yoshida

Universiti Putra Malaysia

Kaori Jono

Japan Fine Ceramics Center

Kimihiro Yamashita

Kobe University

Masahiko Matsumiya

Yokohama National University

Jun‐ichi Hamagami

National College

Cooperative Institutions

John Wiley & Sons (United States)

Japan Fine Ceramics Center

Tokyo Metropolitan University

Pennsylvania State University

Hokkaido University

Shizuoka University

National Institute of Advanced Industrial Science and Technology

Jožef Stefan Institute

Suzuki (Japan)

The University of Tokyo

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Fabrication of Laminate-Type SOFC; Printed Fuel Cell

ECS Transactions (2013)

Seiichi Suda Juan Paulo Wiff Shu Shimada

We have developed a novel laminate-type SOFC stacks that are composed of thin each layers of electrolyte, electrodes and separator since 2005. These layers are prepared by tape casting and screen printing methods and these stacks are monolithically fabricated by simultaneous sintering these layers. We designate these novel stacks or systems as “Printed Fuel Cell”. We successfully fabricated 5-cell stacks that had 1.0-1.5 mm in thick. The stack showed reasonable OCV of more than 5 V at 750-800 o C. Power density of the stack was previously lower than expected, but an adequate porosity and gas channel design of cathode much improved the performance.

Tape casting

Separator (oil production)

Screen printing

Power density

10.1149/05701.0543ecst

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Degradation behavior of ceria-based abrasives slurry during glass polishing

Koichi Kawahara Toshimasa Suzuki Seiichi Suda

Ceria-based abrasives are indispensable for precise polishing of glass substrates. It is of great importance to understand degradation behavior of abrasive slurry for reducing the polishing costs. In this study, we quantitatively investigated the degradation behavior of ceria-based abrasive slurry in glass polishing. Degradation profiles were found to be classified into two regions; the region where degradation was not severe (Region I) and the region where the removal rate rapidly decreased with polishing time (Region Π). The results suggested that the removed glass fragments would cover the active sites of abrasives resulting in the transition from Region I to Region II.

Degradation

Chemical Mechanical Planarization

10.1109/icpt.2014.7017315

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Development of Insulating and Conductive Seals for Controlled Conduction Paths

ECS Transactions (2007)

Seiichi Suda Koichi Kawahara Kaori Jono

Micro-SOFCs require precise control of conduction paths among small cells or stacks. We have developed both insulating and highly conductive gas-tight seals in order to arrange both the seals and to fabricate the gas-tight sealing interface that has various electric conduction paths. The insulating seals were prepared with amorphous Na2O-SiO2 spherical particles and amorphous SiO2 particles. Porous La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) ceramics were used as a porous cathode to investigate sealing behavior. Firing the insulating sheet at 800oC resulted in gas-tight melt sealing. Penetration of viscous fused glasses into porous LSCF was controlled by changing the particle ratios. On the other hand, the highly conductive seals were prepared with various Ag-Si-Ge alloys by metal rolling. The alloys was melted at 850oC in air and led to highly conduction paths. The bi-layer sheets composed of the insulating and the conductive sheets was also resulted in gas- tight sealing at 850oC in air.

Penetration (warfare)

10.1149/1.2729366

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Citations (2)

Gas Sealing Reliability of Glass/Ceramic Composite Seals under SOFC Working Conditions

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2009)

Seiichi Suda Koichi Kawahara Kaori Jono Yasutoshi Mizuta

Abstract not Available.

Ceramic composite

Glass-ceramic

10.1149/ma2009-02/12/1601

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Citations (1)

Formation of thin calcium carbonate films with aragonite and vaterite forms coexisting with polyacrylic acids and chitosan membranes

Journal of Colloid and Interface Science (2004)

Norio Wada Seiichi Suda Kiyoshi Kanamura Takao Umegaki

Vaterite

Polyacrylic acid

10.1016/j.jcis.2004.06.060

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Citations (65)

Preparation of (La, Li)TiO₃ Dense Ceramics using Sol-Gel and Ion-Exchange Process

MRS Proceedings (2002)

Seiichi Suda Hiroyuki Ishii Kiyoshi Kanamura

10.1557/proc-756-ee2.2

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Development of La-doped Ni-SDC Anode for High Performance IT-SOFC of Ni-SDC/LSGM/SSC

ECS Transactions (2009)

Koichi Kawahara Seiichi Suda Mitsunobu Kawano Hiroyuki Yoshida Toru Inagaki

Sr and Mg co-doped lanthanum gallate electrolyte (LSGM) shows high oxide ion conductivity at temperatures of 650-800oC. However, LSGM has rather high chemical reactivity with anode materials; reaction compounds at the anode/electrolyte would lead to the degradation of the SOFC performance. In order to develop the optimum cermet anode for LSGM, La and Sm co-doped ceria (SLDC) was synthesized and investigated in connection with reactivity between SLDC and LSGM. The NiO-SLDC composite particles synthesized by spray pyrolysis were applied for cermet anodes in order to prevent the anode/electrolyte interface from undesirable interfacial reaction. The power density of the cells with Ni-SLDC anode was found to be higher than that with Ni-SDC anode. Current interruption measurements revealed that La addition to SDC has an effect of the decrease in ohmic loss.

Cermet

Non-blocking I/O

Gallate

10.1149/1.3205752

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Ionic Conductivity and Composition of La/Li-TiO2 amorphous spheres prepared with various ion exchenge conditions.

Preprints of Annual Meeting of The Ceramic Society of Japan Preprints of Fall Meeting of The Ceramic Society of Japan 15th Fall Meeting of The Ceramic Society of Japan (2002)

Seiichi Suda Hiroyuki Ishii Hiroto Chiba Kiyoshi Kanamura

10.14853/pcersj.2002f.0.108.0

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Pore size control of porous calcium phosphate by using colloidal templating method

Preprints of Annual Meeting of The Ceramic Society of Japan Preprints of Fall Meeting of The Ceramic Society of Japan 15th Fall Meeting of The Ceramic Society of Japan (2002)

Jun‐ichi Hamagami Gou Yamaguchi Seiichi Suda Kiyoshi Kanamura

Colloidal particle

10.14853/pcersj.2002f.0.204.0

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Thermal Cycle Reliability of Glass/Ceramic Composite Gas Sealing Materials

International Journal of Applied Ceramic Technology (2009)

Seiichi Suda Masahiko Matsumiya Koichi Kawahara Kaori Jono

We have developed glass/ceramic composite seals composed of glass precursors (NS particles) and ceramic precursors (S particles). The composite seals exhibited low gas permeability at room temperature −650°C, irrespective of the fusion profiles. However, short‐term fusion led to the formation of pores in the seals and the pores in the seals depressed the thermal cycle durability. As for the NS/S composite ratios, the addition of S particles obviously improved the thermal cycle durability, but excess addition will bring about delamination at the seal/substrate interface. Appropriate NS/S ratios as well as an adequate fusion profile would result in composite seals with high strength and adhesion.

Glass-ceramic

Ceramic composite

Delamination

10.1111/j.1744-7402.2009.02450.x

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Citations (6)