Faculty Profiles - HIBINO, Takashi

Papers - HIBINO, Takashi

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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

Simplification of solid oxide fuel cell system using partial oxidation of methane Reviewed

Takashi Hibino, Hiroyasu Iwahara

Chemistry Letters page： 1131-1134 1993

Electrochemical methane coupling using protonic conductors Reviewed

Satoshi Hamakawa, Takashi Hibino, Hiroyasu Iwahara

Journal of the Electrochemical Society Vol. 140 page： 459-462 1993

CO2 sensors using BaCeO3-based ceramics Reviewed

Takashi Hibino, Hiroyasu Iwahara

Sensors and Actuators B Vol. 13-14 page： 483-485 1993

固体電解質をメンブレンリアクターに用いたエタンの脱水素 Reviewed Open Access

日比野高士、浜川　聡、岩原弘育

日本化学会誌 Vol. 3 page： 238-242 1993

Dehydrogenation of Ethane Using Solid Electrolytes as Membrane Reactor Reviewed Open Access

Hibino T., Hamakawa S., Iwahara H.

Nippon Kagaku Kaishi Vol. 1993 ( 3 ) page： 238 - 242 1993

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

The membrane reactors using three kinds of ionic conductors have been constructed in order to control the oxidative dehydrogenation of ethane electrochemically (Fig. 1). SrCe0.95. Yb0.05O3_a, Yttria-stabilized zirconia (YSZ) and BaCe0.9Y0.1O3-a were employed as protonic, oxide ionic and their mixed ionic conductors, respectively. When ethane and air were introduced at 700 °C into the anode and the cathode, respectively, and the direct current was passed through the reactor, the formation rate of ethylene became larger as the current density increased in all the reactors (Fig. 4). From the measurement of the anodic potential, one can speculate that the activation of ethane is based on the decrease in partial pressure of hydrogen in the pore of the anode (Fig. 5). The current efficiency for the formation of ethylene decreased in the order of SrCe0.95Yb0.05O3_a, BaCe0.9Y0.1 O3-aand YSZ (Table 1). This order can be explained by the thermal energy generated by changing the entropy of proton in the anodic reaction (Fig. 6). On the other hand, the formation rate of carbon dioxide increased with increasing the basicity of ionic conductors (Table 1). © 1993, The Chemical Society of Japan. All rights reserved.

DOI： 10.1246/nikkashi.1993.238

Scopus

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

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

Coupling of methane was performed using SrCe0.95Ybo.o503-a ceramic as a membrane reactor at 1173 K. The electrochemical cell used was Ag/SrCe0.95Yb005O3_a/Ag. On introducing methane and Ar into the anode and the cathode, respectively, and on passing the direct current through the cell, formation rates of C2-compounds increased from 0.23 to 0.52 mmol min-1 cm-2. From themeasurement of the polarization characteristic, the partial pressure of hydrogen in theporous silver at the anode was found to be reduced by the electrochemical hydrogen pump. In addition, using a mixed conduction (protonic and p-type electronic conduction) of this ceramic, formation rates of C2-products were accelerated further. © 1993, The Electrochemical Society, Inc. All rights reserved.

DOI： 10.1149/1.2221068

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

Studies on Proton Conducting Ceramics Based on Perovskite-type Oxides Reviewed Open Access

Imaizumi H., Hibino T., Yajima T.

Nippon Kagaku Kaishi Vol. 1993 ( 9 ) page： 1003 - 1011 1993

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

Good proton conducting solids usuable at high temperature are applicable to a solid electrolyte for high electrolytic current devices like a fuel cell, an electrolyser for hydrogen production, a hydrogen separator etc. as well as for a high temperature-type chemical sensor. Such materials had been scarcely known until we found a series of oxide ceramics which have appreciable protonic conduction under hydrogen-containing stmosphere at high temprature. They are perovskite-type oxides based on SrCeO3 or BaCeO3 in which some trivalent cations are partially substituted for cerium. SrCe0.95 Yb0.05O3-α, B aCe0.9Nd0.1 O3-α etc. belong to this class of conductors. Later, some zirconate-base sintered oxides were also confirmed to be proton conductors under hydrogen containg atmosphere at high temperature. These oxide ceramics exhibit p-type electronic conduction in an atmosphere free from hydrogen or water vapor. However, when water vapor or hydrogen is introduced to the atmosphere at high temperature, electronic conductivity decreases and protonic conduction appears. When the ceramics are exposed to the hydrogen gas, they become almost pure protonic conductors, the conductivities of which are multi 10-2 S cm-1 at 1000 °C and multi 10-3 S cm-1 at 600 °C. Protonic conduction in these solids could be verified by means of electrochemical permeation of hydrogen across the ceramics. These oxides are unique ionic conductors in respect that they have no host constituents which liberate conducting ion (proton). Using these ceramics as a solid electrolyte, several types of electrochemical devices have been demonstrated by way of experiment. Based on the principle of hydrogen concentration cell, hydrogen sensors have put to practical use for molten aluminum in casting process. © 1993, The Chemical Society of Japan. All rights reserved.

DOI： 10.1246/nikkashi.1993.1003

Scopus

CHARACTERIZATION OF PROTON IN Y-DOPED SRZRO3 POLYCRYSTAL BY IR SPECTROSCOPY Reviewed

HIBINO T, MIZUTANI K, YAJIMA T, IWAHARA H

SOLID STATE IONICS Vol. 58 ( 1-2 ) page： 85 - 88 1992.11

Characterization of proton in Y-doped SrZrO<inf>3</inf> polycrystal by IR spectroscopy Reviewed

Hibino T., Mizutani K., Yajima T., Iwahara H.

Solid State Ionics Vol. 58 ( 1-2 ) page： 85 - 88 1992.11

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

To characterize proton in Y-doped SrZrO3 polycrystal, protonic conductivities and infrared spectra were measured. IR spectra exhibited two OH bands in 3500-2800 and 2650-2300 cm-1 regions, indicating that proton was bound to lattice oxide ion and that its strength of bonding was rather weak. The decrease in conductivity by replacing H+ with D+ suggested that the conducting ion was not hydroxide ion but proton and that it migrated via the dissociation of O-H bond. © 1992.

DOI： 10.1016/0167-2738(92)90014-G

Scopus

EVALUATION OF PROTON CONDUCTIVITY IN SRCEO3, BACEO3, CAZRO3 AND SRZRO3 BY TEMPERATURE PROGRAMMED DESORPTION METHOD Reviewed

HIBINO T, MIZUTANI K, YAJIMA T, IWAHARA H

SOLID STATE IONICS Vol. 57 ( 3-4 ) page： 303 - 306 1992.10

Evaluation of proton conductivity in SrCeO<inf>3</inf>, BaCeO<inf>3</inf>, CaZrO<inf>3</inf> and SrZrO<inf>3</inf> by temperature programmed desorption method Reviewed

Hibino T., Mizutani K., Yajima T., Iwahara H.

Solid State Ionics Vol. 57 ( 3-4 ) page： 303 - 306 1992.10

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

To better understand protonic conduction of perovskite-type oxides based on SrCeO3, CaZrO3 and SrZrO3, their TPD spectra were measured. By estimating the amount of water vapor evolved from these oxides, proton concentrations were found to be smaller in the order SrCe0.95Yb0.05O3-α, BaCe0.95Y0.05O3-α, SrZr0.95Y0.05O3-α and CaZr0.9In 0.1O3-α. Peak maximum temperatures gave the order of proton mobilities as: BaCe0.95Y0.05O3-α>SrZr0.95Y0.05O3-α>CaZr0.9In0.1O3-α>SrCe 0.95Yb0.05O3-α. Protonic conductivity could be explained by these two orders. © 1992.

DOI： 10.1016/0167-2738(92)90162-I

Scopus

ELECTROCHEMICAL METHANE ACTIVATION TO C-2-HYDROCARBONS USING PROTONIC CONDUCTOR Reviewed

HIBINO T, HAMAKAWA S, IWAHARA H

CHEMISTRY LETTERS ( 9 ) page： 1715 - 1716 1992.9