研究者詳細 - 日比野　高士

論文 - 日比野　高士

分割表示 415 件中 161 - 180 件目／全件表示 >>

総説：マイクロリアクターによる水素製造

冨田衷子，日比野高士，佐野　充

ケミカルエンジニアリング 50 巻頁： 18-23 2005年

総説：MP2O7系固体電解質のプロトン導電性とその応用

長尾征洋，冨田衷子，日比野高士，佐野　充

73 巻頁： 846-850 2005年

Single-chamber SOFCs with a Ce0.9Gd0.1O1.95 electrolyte film for low-temperature operation 査読有り

Tomita A, Hirabayashi D, Hibino T, Nagao M, Sano M

ELECTROCHEMICAL AND SOLID STATE LETTERS 8 巻 ( 1 ) 頁： A63 - A65 2005年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochemical and Solid-State Letters

Single-chamber solid oxide fuel cells (SOFCs) with an anode-supported Ce0.9Gd0.1O1.95 electrolyte were operated in a mixture of butane and air at furnace temperatures of 200-300°C. The electromotive force (emf) of the cell and the voltage drop were strongly influenced by the catalytic activity of the anode for the partial oxidation of butane. The promotion of hydrogen formation by the addition of Ru to the anode caused an increase in the emf and a reduction in the voltage drop. As a result, stable power densities of 44 and 176 mW cm-2 were obtained at 200 and 300°C, respectively. © 2004 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.1836120

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Scopus

Surface modification of a doped BaCeO3 to function as an electrolyte and as an anode for SOFCs 査読有り

Tomita A, Hibino T, Sano M

ELECTROCHEMICAL AND SOLID STATE LETTERS 8 巻 ( 7 ) 頁： A333 - A336 2005年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochemical and Solid-State Letters

Dual functions of BaCe0.8Y0.2O3-α, (BCY) as an electrolyte and as an anode were improved for solid oxide fuel cell (SOFC) applications. A porous Ce-rich phase with fluorite structure was formed with a depth of ∼10 μm from the BCY surface by vaporization of BaO from the BCY surface at 1700°C. The resulting BCY surface showed enough electronic conductivity to provide electrical collection and a high electrocatalytic activity for hydrogen oxidation. A hydrogen-air fuel cell with the BCY electrolyte exhibited reasonable performances without using an anode material between 750 and 950°C. © 2005 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.1928230

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SOFC-type microreactors that generate hydrogen for PEFC applications 査読有り

Tomita A., Hirabayashi D., Nagao M., Sano M., Hibino T.

Solid State Ionics 174 巻 ( 1-4 ) 頁： 9 - 13 2004年10月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Solid State Ionics

A fuel cell-type microreader that generates both hydrogen and electrical power from dry butane around 700°C is presented for polymer-electrolyte fuel cell (PEFC) applications. To demonstrate this concept, solid-oxide fuel cells (SOFCs) with different Fe2O3-based anodes were fabricated, and their performances were evaluated. A Fe2O3/Cr 2O3 composite anode met this criterion the most; hydrogen was produced with increasing current density; CO2/CO concentration ratios in the outlet gases were more than 2; polarization resistances were about 1 Ω cm2; carbon deposition was much more suppressed with these anodes than with a Ni/SDC cermet anode. The resulting peak power density was 110 mW cm-2 by using a 0.25-mm-thick Ce0.9Gd 0.1O1.95 (GDC) electrolyte. The effect of Cr 2O3 added into the Fe2O3 anode was also discussed in detail. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ssi.2004.07.023

Scopus

Design of a reduction-resistant Ce0.8Sm0.2O1.9 electrolyte through growth of a thin BaCe1-xSmxO3-α layer over electrolyte surface 査読有り

Daisuke Hirabayashi, Atsuko Tomita, Takashi Hibino, Masahiro Nagao, Mitsuru Sano

Electorochemical and Solid-State Letters 7 巻頁： A318-A320 2004年10月

Electrochemical properties of lithium manganese oxides with different surface areas for lithium ion batteries 査読有り

Takahashi K, Saitoh M, Asakura N, Hibino T, Sano M, Fujita M, Kifune K

JOURNAL OF POWER SOURCES 136 巻 ( 1 ) 頁： 115 - 121 2004年9月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Power Sources

Two lithium manganese oxides, Li1.03Mn1.96O 4, with different surface areas of 3.55 and 0.68m2/g were prepared and their electrochemical properties were studied as positive electrodes for lithium ion batteries. Cycle performance tests gave capacity losses of 9 and 18% at 25°C, and 28 and 33% at 55°C for the samples with larger and smaller surface areas, respectively. The recovery of capacity losses have been found on the addition of the conductor after cycles. The defect of the conductivity between the active materials and the conductors was found mostly responsible for the capacity loss in the smaller surface sample at 25°C. Cycle performance tests in each region of the charge states divided into five regions show that larger capacity losses are observed in rather lower potential states. Storage performances show the largest capacity loss at 10 and 20% of SOC and the less capacity losses at both 0 and 50-100% of SOC in both of the samples. However, in every region, the capacity loss is much smaller in the larger surface sample than in the smaller surface sample. The maximum Mn dissolution is observed to occur at 100% of SOC (4.5V) and the next is found around 10-20% of SOC in either sample. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2004.05.014

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Bi-based oxide anodes for direct hydrocarbon SOFCs at intermediate temperatures 査読有り

Daisuke Hirabayashi, Atsuko Hashimoto, Takashi Hibino, Ushio Harada,Mitsuru Sano

Electrochemical and Solid-State Letters 7 巻頁： A108-A110 2004年5月

Proton conduction at the surface of Y-doped BaCeO3 and its application to an air/fuel sensor 査読有り

Tomita A, Hibino T, Suzuki M, Sano M

JOURNAL OF MATERIALS SCIENCE 39 巻 ( 7 ) 頁： 2493 - 2497 2004年4月

Proton conduction at the surface of Y-doped BaCeO<inf>3</inf> and its application to an air/fuel sensor 査読有り

Tomita A., Hibino T., Suzuki M., Sano M.

Journal of Materials Science 39 巻 ( 7 ) 頁： 2493 - 2497 2004年4月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Materials Science

25 mol% Y3+-doped BaCeO3 (BCY25) showed an extremely low activation energy of 0.3 eV for proton conduction at the surface. The resulting overall conductivity at the surface reached 8.24 × 10 -3 S cm-1 at 400°C, which was 3, 8, and 28 times higher than those in the bulk of BCY25, 20 mol% Sm3+-doped ceria, and 8 mol% yttria-stabilized zirconia, respectively. Such fast proton conduction enabled an air/fuel (A/F) sensor using BCY25 as the solid electrolyte to work above 150°C for H2 and above 250°C for C2H 4. © 2004 Kluwer Academic Publishers.

DOI： 10.1023/B:JMSC.0000020015.80430.d8

Scopus

Proton conduction at the surface of Y-doped BaCeO3 and its application to an air/fuel sensor 査読有り

Atsuko Hashimoto, Takashi Hibino, Masanori Suzuki, Mitsuru Sano

Journal Of Materials Science 39 巻頁： 2493-2497 2004年4月

Solid oxide fuel cells operating without using an anode material 査読有り

Hirabayashi D, Tomita A, Brito ME, Hibino T, Harada U, Nagao M, Sano M

SOLID STATE IONICS 168 巻 ( 1-2 ) 頁： 23 - 29 2004年3月

Solid oxide fuel cells operating without using an anode material 査読有り

Hirabayashi D., Tomita A., Brito M.E., Hibino T., Harada U., Nagao M., Sano M.

Solid State Ionics 168 巻 ( 1-2 ) 頁： 23 - 29 2004年3月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Solid State Ionics

We proposed a new type of solid oxide fuel cell (SOFC) operating without using an anode material, where the anode was spontaneously formed by reduction of the electrolyte surface under reducing gas conditions. A BaCe 0.76Y0.20Pr0.04O3-α electrolyte most successfully met this criterion. This material showed high mixed protonic-electronic conduction, whereas the open circuit voltage (OCV) of the cell was slightly lower than the theoretical value. The resulting SOFC exhibited reasonable fuel cell performances together with a good stability to thermal and redox cyclings and high resistance to carbon deposition up to 800 °C for dry methane, ethane, and propane. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ssi.2004.01.024

Scopus

SOFC-type microreactors that generate Hydrogen for PEFC applications 査読有り

Atsuko Tomita, Daisuke Hirabayashi, Masahiro Nagao, Mitsuru Sano, Takashi Hibino

Solid State Ionics 174 巻頁： 9-13 2004年

Solid oxide fuel cells operating without using an anode material 査読有り

Daisuke Hirabayashi, Atsuko Tomita, M.E.Brito, Takashi Hibino, Ushio Harada, Masahiro Nagao, Mitsuru Sano

Solid State Ionics 168 巻頁： 23-29 2004年

Bi-based oxide anodes for direct hydrocarbon SOFCs at intermediate temperatures 査読有り

Hirabayashi D, Hashimoto A, Hibino T, Harada U, Sano M

ELECTROCHEMICAL AND SOLID STATE LETTERS 7 巻 ( 5 ) 頁： A108 - A110 2004年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochemical and Solid-State Letters

Doped Bi-based oxides were investigated as potential anode materials for direct hydrocarbon solid oxide fuel cells (SOFCs) at intermediate temperatures. (Bi2O3)0.85(Ta2O5) 0.15 met this criterion most successfully. A fraction of Bi 2O3 in this material was reduced to BiO and Bi metal under fuel conditions, which yielded high conductivities (>1 S cm-1) based on oxide ions and electrons above 500°C. Carbon deposition was successfully prevented when butane was used as the fuel below 800°C. The catalytic activities for hydrocarbon oxidation were high enough to promote the complete oxidation of butane during cell operation. These abilities provided an enhanced anode performance with increasing temperature from 600 to 750°C, and the resulting polarization resistance reached 1.4 Ω cm2 at 750°C. © 2004 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.1667791

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Scopus

Design of a reduction-resistant Ce0.8Sm0.2O1.9 electrolyte through growth of a thin BaCe1-xSmxO3-alpha a layer over electrolyte surface 査読有り

Hirabayashi D, Tomita A, Hibino T, Nagao M, Sano M

ELECTROCHEMICAL AND SOLID STATE LETTERS 7 巻 ( 10 ) 頁： A318 - A320 2004年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochemical and Solid-State Letters

A method that can block off electronic current through a samaria-doped ceria (SDC, Ce0.8Sm0.2O1.9) electrolyte is proposed. A thin BaCeO3-based layer 12 μm thick was grown by a solid-state reaction of the electrolyte substrate and a BaO film deposited previously over the substrate surface at 1500°C. A homogeneous junction between the layer and the electrolyte was formed, thus allowing no delamination and cracking of the layer. Tolerance of this layer to CO2 was high enough to suppress decomposition into BaCO3 and CeO2. Open-circuit voltages of a hydrogen-air fuel cell with the coated SDC electrolyte were near 1 V or more in the range of 600-950°C. The resulting peak power density was higher than that of a fuel cell with an uncoated SDC electrolyte. © 2004 The Electrochemical Society.

DOI： 10.1149/1.1786231

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Intermediate-temperature SOFCs with Ru-catalyzed Ni-cermet anodes 査読有り

Hashimoto A., Hirabayashi D., Hibino T., Sano M.

Key Engineering Materials 269 巻頁： 151 - 154 2004年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Key Engineering Materials

The promotion of the direct electrochemical oxidation of hydrocarbons in a solid oxide fuel cell was investigated using a ceria-based electrolyte with different noble metals-containing anode at 600°C. The attempted approach toward this objective was to avoid interference from a large amount of steam and CO2 products, because they degrade the anode performance. Ru was an effective catalyst for removing these gases from the anode surface due to its high catalytic activity for the steam and CO2 reforming of hydrocarbons. This permitted a smooth access of the unreacted hydrocarbons to the three-phase boundary, thus resulting in a noticeably high anode performance. The resulting peak power density reached 750 mW cm-2 with dry methane, which was comparable to the peak power density of 769 mW cm -2 with wet hydrogen.

DOI： 10.4028/www.scientific.net/kem.269.151

Scopus

Ru-catalyzed anode materials for direct hydrocarbon SOFCs 査読有り

Hibino T, Hashimoto A, Yano M, Suzuki M, Sano M

ELECTROCHIMICA ACTA 48 巻 ( 17 ) 頁： 2531 - 2537 2003年7月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochimica Acta

A solid oxide fuel cell using a thin ceria-based electrolyte film with a Ru-catalyzed anode was directly operated on hydrocarbons, including methane, ethane, and propane, at 600 °C. The role of the Ru catalyst in the anode reaction was to promote the reforming reaction of the unreacted hydrocarbons by the produced steam and CO2, which avoided interference from steam and CO2 in the gas-phase diffusion of the fuels. The resulting peak power density reached 750 mW cm-2 with dry methane, which was comparable to the peak power density of 769 mW cm-2 with wet (2.9 vol.% H2O) hydrogen. More important was the fact that the cell performance was maintained at a high level regardless of the change in the methane utilization from 12 to 46% but was significantly reduced by increasing the hydrogen utilization from 13 to 42%. While the anodic reaction of hydrogen was controlled by the slow gas diffusion, the anodic reaction of methane was not subject to the onset of such a gas-diffusion process. © 2003 Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0013-4686(03)00296-2

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A resistor-type sensor for the detection of CO in reformed gases 査読有り

Atsuko Hashimoto, Takashi Hibino, Kazuyo Kobayashi, Mitsuru Sano

Electrochemistry 71 巻頁： 398-401 2003年6月

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