Faculty Profiles - HIBINO, Takashi

Papers - HIBINO, Takashi

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An electrochemical steam pump using a proton conducting ceramic Reviewed

Hiroyasu Iwahara, Takashi Hibino, T. Sunano

Journal of Applied Electrochemistry Vol. 26 page： 829-832 1996

総説：触媒技術を利用した固体電解質の新しい応用

日比野高士

触媒 Vol. 38 page： 332-333 1996

総説：酸素分離セラミックス膜

日比野高士

工業材料 Vol. 44 page： 102-104 1996

An electrochemical steam pump using a proton conducting ceramic Reviewed

Iwahara H., Hibino T., Sunano T.

Journal of Applied Electrochemistry Vol. 26 ( 8 ) page： 829 - 832 1996

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Applied Electrochemistry

An electrochemical steam pump was operated at temperatures of 700-900deg;C using a high-temperature type protonic conductor, SrCe0.95Yb0.05O3-α, as a solid electrolyte. When wet air and dry air were introduced into the anode and cathode, respectively, and direct current was applied to the solid electrolyte, the partial pressure of water vapour decreased at the anode, while it increased at the cathode. At low current densities, the pumping rate of water vapour was increased by decreasing the operating temperature and increasing the partial pressure of water vapour at the anode. This is due to the change in proton transport number in SrCe0.95Yb0.05O3-α which depends on the operating condition. At high current densities, the pumping rate was limited by the diffusion rate of water vapour through the porous anode. © 1996 Chapman & Hall.

DOI： 10.1007/BF00683745

Scopus

Studies on solid electrolytes for a new-type SOFC using methane-air mixture Reviewed

Asano K., Hibino T., Iwahara H.

Denki Kagaku Vol. 64 ( 6 ) page： 649 - 653 1996

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Denki Kagaku

In order to find out a suitable electrolyte for a new-type SOFC (one chamber with methane - air mixture), YSZ (8 mol% Y2O3) doped with TiO2 was tested as a solid electrolyte. In the case of non-doped YSZ, the open - circuit voltage of the cell decreased with time, and the electric power density was extremely smaller than the value obtained in a conventional SOFC using YSZ as a solid electrolyte. However, in the case of YSZ doped with TiO2 (5 mol%), the electric power density was about 6 times higher than that in the case of YSZ only, although the terminal voltage of the cell-slightly decreased with time. This was based on the difference in cathodic polarization and transitional change in the potential between these electrolytes.

DOI： 10.5796/kogyobutsurikagaku.64.649

Scopus

Membrane reactor for oxidative coupling of CH4 with an oxide ion-electron hole mixed conductor Reviewed

Hibino T, Sato T, Ushiki K, Kuwahara Y

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS Vol. 91 ( 24 ) page： 4419 - 4422 1995.12

Medium-temperature electrolysis of NO and CH<inf>4</inf> under lean-burn conditions using ytrria-stabilized zirconia as a solid electrolyte Reviewed

Hibino T., Ushiki K.I., Kuwahara Y., Mizuno M., Masegi A., Iwahara H.

Journal of the Chemical Society, Faraday Transactions Vol. 91 ( 13 ) page： 1955 - 1959 1995.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Chemical Society, Faraday Transactions

Electrolysis of NO and CH4 in the presence of excess O2 has been studied using a single-compartment reactor, constructed from yttria-stabilized zirconia (YSZ), with two palladium electrodes. The palladium electrodes were attached by an electroless plating method. Experiments were conducted between 550 and 900 °C with a mixture of 1000 ppm NO, 1000 ppm CH4, 2% O2, 5% H2O and 5% CO2 in argon at a flow rate of 50 ml min-1. The reduction of NO to N2 and the oxidation of CH4 to CO2 were promoted by applying a direct current between the two palladium electrodes. The current efficiency for the reduction of NO was about 1.5% at all measured temperatures, while that for the oxidation of CH4 decreased from 2.7 to 0.3% with increasing temperature from 550 to 900 °C. The dc resistance of the reactor was mainly due to the ohmic resistance of the electrolyte. The transport properties of O2- through the electrolyte followed Faraday's law under operating conditions. These results were strongly dependent on the morphology and thickness of the palladium electrode.

DOI： 10.1039/FT9959101955

Scopus

Membrane reactor for oxidative coupling of CH<inf>4</inf> with an oxide ion-electron hole mixed conductor Reviewed

Hibino T., Sato T., Ushiki K.I., Kuwahara Y.

Journal of the Chemical Society, Faraday Transactions Vol. 91 ( 24 ) page： 4419 - 4422 1995.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Chemical Society, Faraday Transactions

A membrane reactor for the oxidative coupling of CH4 has been constructed with an oxide ion-electron hole mixed conductor, BaCe0.8Gd0.2O3-α. 10% CH4 diluted with Ar and an O2-Ar mixture at a given ratio were fed into opposite sides of the membrane at 1173 K. The formation rate of C2-hydrocarbons (ethane and especially ethene) in the CH4 compartment increased with Po2 in the O2-Ar compartment. This enhancement was due to electrochemical oxygen permeation, causing the conductor to short-circuit itself, resulting form the mixed conduction. For comparison, 10% CH4 and a small amount of O2 were co-fed into one side of the membrane. The membrane operation gave a C2 selectivity two times that of the co-feed operation for all CH4 conversions. From a catalytic study using BaCe1-xGdxO3-α powders as catalyst, it was found that increasing both the oxide-ion and electron-hole conductivities enhanced the formation of C2 hydrocarbons, but reduced that of CO2. On the basis of these results, a mechanism for the oxidative coupling of CH4 of the mixed-conductor membrane was proposed.

DOI： 10.1039/FT9959104419

Scopus

Oxidative coupling reaction of CH<inf>4</inf> using oxide ion and electron hole mixed conductive BaCe<inf>0.8</inf>Gd<inf>0.2</inf>O<inf>3-α</inf> ceramic as a membrane reactor Reviewed

Hibino T., Ushiki K.I., Kuwahara Y.

Journal of the Chemical Society, Chemical Communications ( 10 ) page： 1001 - 1002 1995.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Chemical Society, Chemical Communications

When CH4 and O2 are fed into opposite sides of an electrochemical reactor using BaCe0.8Gd0.2O 3-α ceramic as a solid oxide membrane, the formation of C 2 hydrocarbons is enhanced by self-short circuiting the reactor owing to oxide ion and electron hole mixed conduction in the ceramic.

DOI： 10.1039/C39950001001

Scopus

A NOVEL CELL DESIGN FOR SIMPLIFYING SOFC SYSTEM Reviewed

HIBINO T, USHIKI K, SATO T, KUWAHARA Y

SOLID STATE IONICS Vol. 81 ( 1-2 ) page： 1 - 3 1995.10

A novel cell design for simplifying SOFC system Reviewed

Hibino T., Ushiki K., Sato T., Kuwahara Y.

Solid State Ionics Vol. 81 ( 1-2 ) page： 1 - 3 1995.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Solid State Ionics

A novel design for the solid oxide fuel cell (SOFC) has been proposed. By attaching palladium and gold electrodes on the same face of BaCe0.8Gd0.2O3-α electrolyte and feeding a mixture of CH4 and O2 (CH4:O2 mole ratio = 2:1) to the cell at 950 °C, an electric power could be generated from the cell. The main advantages are that the ohmic resistance of the cell decreased with reducing distance between the two electrodes and that some unit cells were connected in series and parallel with one another on the same electrolyte. © 1995.

DOI： 10.1016/0167-2738(95)00197-E

Scopus

A Novel Solid Oxide Fuel Cell System Using the Partial Oxidation of Methane Reviewed

Asano K., Hibino T., Iwahara H.

Journal of the Electrochemical Society Vol. 142 ( 10 ) page： 3241 - 3245 1995.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Electrochemical Society

A novel solid oxide fuel cell (SOFC) system, which does not need to separate the supply of fuel and oxidant gases and generates electric power as well as chemicals, was studied. The fuel cell consisted of PtiBaCe08gY0.2O3_alAu, in which two electrodes were exposed to the same mixture of CH4 and air. Electromotive forces (EMFs) were about 700 ~ 800 mV at operating temperatures between 750 and 950°C, and terminal voltages were about 420 mV with discharge a current density of about 400 mA cm-2 (0.17 W cm-2) at 950°C and 350 mV with 75 mA cm-2 (0.03 W cm-2) at 750°C. The working mechanism of the fuel cell was clarified to be based on the difference in catalytic activity for the partial oxidation of methane between two electrode materials: the Pt catalyzes the partial oxidation of methane to form hydrogen and carbon monoxide, while the Au is inactive to this reaction. Therefore, the Pt acts as a fuel electrode, while the Au acts as an oxygen electrode at which electrochemical reduction of oxygen takes place on discharging the cell. © 1995, The Electrochemical Society, Inc. All rights reserved.

DOI： 10.1149/1.2049968

Scopus

ELECTROCATALYTIC OXIDATION OF METHANE BY ALTERNATING-CURRENT ELECTROLYSIS USING YTTRIA-STABILIZED ZIRCONIA Reviewed

HIBINO T, MASEGI A, IWAHARA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 142 ( 10 ) page： 3262 - 3267 1995.10

Electrocatalytic Oxidation of Methane by Alternating Current Electrolysis Using Yttria-Stabilized Zirconia Reviewed

Hibino T., Iwahara H.

Journal of the Electrochemical Society Vol. 142 ( 10 ) page： 3262 - 3267 1995.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Electrochemical Society

The activity and selectivity of a palladium catalyst for the partial oxidation of methane have been improved by attaching two palladium catalysts to the faces of a zirconia-based ceramic and by applying an ac voltage between the two catalysts. Experiments were conducted between 873 and 1273 K with a mixture of 6.6% methane and 3.3% oxygen in argon. AC voltages at a frequency of 60 Hz were applied to the reactor. Above 1073 K, the amounts of unreacted methane and oxygen decreased, and the yields of hydrogen and carbon monoxide (synthesis gas) increased. At an ac voltage of 3 V at 1273 K, the yield of synthesis gas was up to two times more than that under the open-circuit condition. This enhancement was better than that found by applying a dc voltage of 3 V, in which case the yield of synthesis gas was 1.3 times more than that under the open-circuit condition. © 1995, The Electrochemical Society, Inc. All rights reserved.

DOI： 10.1149/1.2049972

Scopus

A NOVEL SOLID OXIDE FUEL-CELL SYSTEM USING THE PARTIAL OXIDATION OF METHANE Reviewed

ASANO K, HIBINO T, IWAHARA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 142 ( 10 ) page： 3241 - 3245 1995.10

MEDIUM-TEMPERATURE ELECTROLYSIS OF NO AND CH4 UNDER LEAN-BURN CONDITIONS USING YTRRIA-STABILIZED ZIRCONIA AS A SOLID-ELECTROLYTE Reviewed

HIBINO T, USHIKI K, KUWAHARA Y, MIZUNO M, MASEGI A, IWAHARA H

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS Vol. 91 ( 13 ) page： 1955 - 1959 1995.7

Electrochemical studies on ionic conduction in Ca-doped BaCeO<inf>3</inf> Reviewed

Iwahara H., Mori T., Hibino T.

Solid State Ionics Vol. 79 ( C ) page： 177 - 182 1995.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Solid State Ionics

BaCeO3-based ceramics exhibit both protonic and oxide ionic conduction at high temperatures. In order to investigate the relation between ionic conduction in these oxides and the valence of the dopant cation, divalent Ca-doped BaCeO3 oxides were synthesized and their conduction properties were studied comparing them with those of trivalent Y-doped ones. When the dopant cation was changed from Y to Ca, both protonic and oxide ionic conductivities decreased. TPD analysis and electrochemical tracer experiment showed that the decrease in protonic conductivity could be ascribed to the decrease both in proton concentration and its mobility in the oxides. © 1995.

DOI： 10.1016/0167-2738(95)00058-E

Scopus

ELECTROCHEMICAL STUDIES ON IONIC-CONDUCTION IN CA-DOPED BACEO3 Reviewed

IWAHARA H, MORI T, HIBINO T

SOLID STATE IONICS Vol. 79 page： 177 - 182 1995.7

OXIDATIVE COUPLING REACTION OF CH4 USING OXIDE-ION AND ELECTRON-HOLE MIXED CONDUCTIVE BACE0.8GD0.2O3-ALPHA CERAMIC AS A MEMBRANE REACTOR Reviewed

HIBINO T, USHIKI K, KUWAHARA Y

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS ( 10 ) page： 1001 - 1002 1995.5

ELECTROCATALYTIC OXIDATION OF METHANE TO C-2 HYDROCARBONS USING AN LI+ ION CONDUCTOR Reviewed

HIBINO T, MASEGI A, IWAHARA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 142 ( 5 ) page： L72 - L73 1995.5

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Papers - HIBINO, Takashi