Faculty Profiles - HIBINO, Takashi

Papers - HIBINO, Takashi

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PROTONIC CONDUCTION OF MORDENITE-TYPE ZEOLITE Reviewed

HIBINO T, AKIMOTO T, IWAHARA H

SOLID STATE IONICS Vol. 67 ( 1-2 ) page： 71 - 76 1993.12

Protonic conduction of mordenite-type zeolite Reviewed

Hibino T., Akimoto T., Iwahara H.

Solid State Ionics Vol. 67 ( 1-2 ) page： 71 - 76 1993.12

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

The protonic conduction of H-mordenite has been investigated by various measurements. A hydrogen concentration cell using mordenite as a solid electrolyte gave rise to a stable EMF, in which the potential of the electrode with high partial pressure of hydrogen was negative. In addition, a stable and steady current could be drawn from a hydrogen-air fuel cell. The proton conductivity of mordenite at RT was 1.07 × 10-5 S cm-1. As the temperature increased, the conductivity once decreased, but then increased according to Arrhenius behavior. TGA measurement suggested that the decrease in conductivity with temperature was due to a decrease in amount of the adsorbed water. From the compositional dependence of the conductivity and the H/D isotope effect on the conductivity, two conduction mechanisms were proposed. © 1993.

DOI： 10.1016/0167-2738(93)90311-P

Scopus

H/D Isotope Effect on Electrochemical Pumps of Hydrogen and Water Vapor Using a Proton-Conductive Solid Electrolyte Reviewed

Hibino T., Mizutani K., Iwahara H.

Journal of the Electrochemical Society Vol. 140 ( 9 ) page： 2588 - 2592 1993.9

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

From the standpoint of an H/D isotope effect, the electrochemical pumping of hydrogen or water vapor has been studied using a high temperature proton conductor as a solid electrolyte. When a potential was applied to the cell at 1173 K, the pumping rate of deuterium was remarkably smaller than that of hydrogen. During hydrogen pumping, the total current was depressed by replacing H+ and D+. In addition, an increase in cathodic overpotential was observed by the current-interruption method. Similar behavior was recognized in the pumping of water vapor, except that the transport number of the conducting ion decreased with replacement of D+ by H+. © 1993, by The Electrochemical Society, Inc. All rights reserved.

DOI： 10.1149/1.2220867

Scopus

Inactivation of external surface of mordenite and ZSM-5 by chemical vapor deposition of silicon alkoxide Reviewed

Hibino T., Niwa M., Murakami Y.

Zeolites Vol. 13 ( 7 ) page： 518 - 523 1993.9

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

The present paper describes the inactivation of the external surfaces of mordenite and ZSM-5 zeolites using chemical vapor deposition (CVD) of Si(OCH3)4. The external surfaces of H mordenites with different Si/Al atomic ratios, Na mordenite, and HZSM-5 were deactivated by a silica layer. The silicon concentration required for the inactivation did not depend upon the included cation and the atomic ratio of Si/Al. Si(OCH3)4 reacted equivalently with terminal hydroxides and acidic hydroxides. © 1993.

DOI： 10.1016/0144-2449(93)90228-U

Scopus

H/D ISOTOPE EFFECT ON ELECTROCHEMICAL PUMPS OF HYDROGEN AND WATER-VAPOR USING A PROTON-CONDUCTIVE SOLID-ELECTROLYTE Reviewed

HIBINO T, MIZUTANI K, IWAHARA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 140 ( 9 ) page： 2588 - 2592 1993.9

STUDIES ON PROTON CONDUCTING CERAMICS BASED ON PEROVSKITE-TYPE OXIDES Reviewed

IWAHARA H, HIBINO T, YAJIMA T

NIPPON KAGAKU KAISHI ( 9 ) page： 1003 - 1011 1993.9

SIMPLIFICATION OF SOLID OXIDE FUEL-CELL SYSTEM USING PARTIAL OXIDATION OF METHANE Reviewed

HIBINO T, IWAHARA H

CHEMISTRY LETTERS ( 7 ) page： 1131 - 1134 1993.7

Performance of Solid Oxide Fuel Cell Using Proton and Oxide Ion Mixed Conductors Based on BaCe<inf>1-x</inf>Sm<inf>x</inf>O<inf>3-α</inf> Reviewed

Iwahara H., Yajima T., Hibino T., Ushida H.

Journal of the Electrochemical Society Vol. 140 ( 6 ) page： 1687 - 1691 1993.6

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

BaCe1-xSmxO3α (x = 0.05, 0.10, 0.15) ceramics were synthesized and their ionic conduction was investigated. These ceramics showed protonic and oxide ionic mixed conduction under fuel cell condition. While protonic conduction was predominant below 1027 K, oxide ionic conduction became significant as the temperature increased. Using these oxides as solid electrolyte, hydrogen-air fuel cell could be constructed. BaCe0.9Sm0.1O3α exhibited the best cell performance among the electrolytes examined. The maximum short-circuit current density was about 900 mA/cm2 at 1273 K. The polarization at each electrode was low. Porous nickel could be used as anode material instead of expensive platinum and La0.6Ba0.4CoO3 as cathode material. © 1993, The Electrochemical Society, Inc. All rights reserved.

DOI： 10.1149/1.2221624

Scopus

PERFORMANCE OF SOLID OXIDE FUEL-CELL USING PROTON AND OXIDE-ION MIXED CONDUCTORS BASED ON BACE1-XSMXO3-ALPHA Reviewed

IWAHARA H, YAJIMA T, HIBINO T, USHIDA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 140 ( 6 ) page： 1687 - 1691 1993.6

CO2 SENSORS USING BACEO3-BASED CERAMICS Reviewed

HIBINO T, IWAHARA H

SENSORS AND ACTUATORS B-CHEMICAL Vol. 13 ( 1-3 ) page： 483 - 485 1993.5

CO<inf>2</inf> sensors using BaCeO<inf>3</inf>-based ceramics Reviewed

Hibino T., Iwahara H.

Sensors and Actuators: B. Chemical Vol. 13 ( 1-3 ) page： 483 - 485 1993.5

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Sensors and Actuators: B. Chemical

The resistivity of a BaCe0.95Y0.05O3-α ceramic element is very sensitive to CO2 in a moist atmosphere. A reproducible linear relationship between the resistivity and the CO2 concentration is observed in the range 200-300 ppm. In situ FT-IR spectra indicate that hydroxides are formed on the BaCe0.95Y0.05O3-α surface in the moist atmosphere and react with CO2 to form carbonates. From various electrochemical measurements, it is found that the carbonates formed do not increase the bulk resistivity of BaCe0.95Y0.05O3-α but the resistivity of the interface between the electrolyte and the electrode. © 1993.

DOI： 10.1016/0925-4005(93)85433-B

Scopus

PROTONIC CONDUCTION IN CALCIUM, STRONTIUM AND BARIUM ZIRCONATES Reviewed

IWAHARA H, YAJIMA T, HIBINO T, OZAKI K, SUZUKI H

SOLID STATE IONICS Vol. 61 ( 1-3 ) page： 65 - 69 1993.5

Protonic conduction in calcium, strontium and barium zirconates Reviewed

Iwahara H., Yajima T., Hibino T., Ozaki K., Suzuki H.

Solid State Ionics Vol. 61 ( 1-3 ) page： 65 - 69 1993.5

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

Electrical conduction in sintered oxides based on calcium, strontium or barium zirconate at high temperature was investigated electrochemically. When Zr in MZrO3 (M=Ca, Sr or Ba) was partially replaced by trivalent element such as In, Sc, Y, etc., the resultant solid solutions exhibited protonic conduction under hydrogen-containing atmosphere at elevated temperatures. In general, the protonic conductivities of BaZrO3- and SrZrO3-based ceramics were higher than those of CaZrO3-based one although the values were low compared to those of SrCeO3 or BaCeO3-based ceramics. Clear isotope effects in IR spectrum and conductivity were observed between protonated and deuteronated SrZr0.95Y0.05O3-α. © 1993.

DOI： 10.1016/0167-2738(93)90335-Z

Scopus

DEHYDROGENATION OF ETHANE USING SOLID ELECTROLYTES AS MEMBRANE REACTOR Reviewed

HIBINO T, HAMAKAWA S, IWAHARA H

NIPPON KAGAKU KAISHI ( 3 ) page： 238 - 242 1993.3

ELECTROCHEMICAL METHANE COUPLING USING PROTONIC CONDUCTORS Reviewed

HAMAKAWA S, HIBINO T, IWAHARA H

JOURNAL OF THE ELECTROCHEMICAL SOCIETY Vol. 140 ( 2 ) page： 459 - 462 1993.2

Protonic conduction in calcium, strontium and barium zirconates Reviewed

Hiroyasu Iwahara, Tamotsu Yajima, Takashi Hibino, K. Ozaki, H. Suzuki

Solid State Ionics Vol. 61 page： 65-69 1993

Performance of solid oxide fuel cell using proton and oxide-ion mixed conductors based on BaCe1-xSmxO3-a Reviewed

Hiroyasu Iwahara, Tamotsu Yajima, Takashi Hibino, Haruhisa Ushida

Journal of The Electrochemical Society Vol. 140 page： 1687-1691 1993

Protonic conduction of mordenite-type zeolite Reviewed

Takashi Hibino, T. Akimoto, Hiroyasu Iwahara

Solid State Ionics, Vol. 67 page： 71-76 1993

H/D isotope effect on electrochemical pumps of hydrogen and water vapor using a proton-conductive solid electrolyte Reviewed

Takashi Hibino, Keigo Mizutani, Hiroyasu Iwahara

Journal of the Electrochemical Society Vol. 140 page： 2588-2592 1993

Inactivation of external surface of mordenite and ZSM-5 by chemical vapor deposition of silicon alkoxide Reviewed

Takashi Hibino, Miki Niwa, Yuichi Murakami

Zeolites Vol. 13 page： 518-523 1993

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