Faculty Profiles - HIBINO, Takashi

Papers - HIBINO, Takashi

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Detection of propylene using two zirconia-based electrochemical cells Reviewed

Hibino T., Kuwahara Y.

Journal of the Electrochemical Society Vol. 146 ( 1 ) page： 382 - 386 1999

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

A sensor element detecting propylene at high temperatures has been fabricated by attaching two Pd or Pt|YSZ|Au cells together where the Pd or Pt electrodes were located on the inside of the assembly. The sensing properties of the sensor at 750°C were investigated using a flowing mixture of propylene, methane, carbon monoxide, and oxygen, the concentrations of which were in the range of 100 to 700 ppm. The sensor element using the Pd electrode had a high sensitivity to propylene, but a low selectivity to propylene over methane. The use of the Pt electrode made it possible to significantly improve the selectivity to propylene over methane, because the catalytic activities of the Pt electrode for the oxidation of methane were far lower than that of the Pd electrode and as low as that of the Au electrode. The current signal at a fixed oxygen concentration of 300 ppm was almost proportional to the propylene concentration. In addition, the current signal at a fixed propylene concentration of 350 ppm was not significantly affected by changing the oxygen concentration. © 1999 The Electrochemical Society. S0013-4651(98)04-049-X. All rights reserved.

DOI： 10.1149/1.1391618

Scopus

Nonideal electromotive force of zirconia sensors for unsaturated hydrocarbon gases Reviewed

Hibino T, Kuwahara Y, Wang SQ, Kakimoto S, Sano M

ELECTROCHEMICAL AND SOLID STATE LETTERS Vol. 1 ( 4 ) page： 197 - 199 1998.10

Nonideal electromotive force of zirconia sensors for unsaturated hydrocarbon gases Reviewed

Hibino T., Kuwahara Y., Wang S., Kakimoto S., Sano M.

Electrochemical and Solid-State Letters Vol. 1 ( 4 ) page： 197 - 199 1998.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Electrochemical and Solid-State Letters

Non-Nernstian behaviors of a zirconia-based oxygen sensor for 0-500 ppm saturated and unsaturated hydrocarbon gases were studied in the presence of 10% oxygen at 600°C. The sensor, using an Au sensing electrode, produced large electromotive forces (emfs) for the unsaturated hydrocarbons which were aliphatic as well as aromatic. The emf values of the sensor for the hydrocarbons were strongly affected by their unsaturation fraction, carbon number, and chain structure. © 1998 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.1390683

Scopus

Detection of propylene under oxidizing conditions using zirconia-based potentiometric sensor Reviewed

Hibino T, Wang SQ, Kakimoto S, Sano M

SENSORS AND ACTUATORS B-CHEMICAL Vol. 50 ( 2 ) page： 149 - 155 1998.7

NOx detection using the electrolysis of water vapor in a YSZ cell Part II. Electrochemical oxygen pump Reviewed

Hibino T., Kuwahara Y., Otsuka T., Ishida N., Oshima T.

Solid State Ionics Vol. 107 ( 3-4 ) page： 217 - 220 1998.4

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

The detection of NO in the presence of excess oxygen has been carried out using four electrochemical cells, Pt|YSZ|Pt, which serve as an electrochemical pumping cell, an electrolysis cell and two oxygen sensors, respectively. Their operation temperature was 800°C. A mixture of 0-2500 ppm NO, 1-7% oxygen, 3-10% water vapor and 0-10% carbon dioxide in argon was used as a sample gas. At the electrochemical pumping cell, oxygen in the sample gas was removed down to a constant concentration of 1800 ppm, which was monitored by the oxygen sensor. At the electrolysis cell, water vapor in the sample gas was electrolyzed, and the resulting hydrogen reacted with NO in the sample gas. Finally, the sample gas was fed into another oxygen sensor. Two potentiometric and amperometric methods were adopted to detect NO. In the potentiometric method, the EMF value of the oxygen sensor decreased with increasing NO concentration. In the amperometric method, the current applied to the electrolysis cell was proportional to the concentration of NO. Additionally, the influences of the coexisting oxygen, water vapor and carbon dioxide in the sample gas on the detection of NO were investigated in detail. © 1998 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/s0167-2738(97)00539-0

Scopus

NOx detection using the electrolysis of water vapour in a YSZ cell Part I. NOx detection Reviewed

Hibino T., Kuwahara Y., Otsuka T., Ishida N., Oshima T.

Solid State Ionics Vol. 107 ( 3-4 ) page： 213 - 216 1998.4

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

The reaction of NO with the hydrogen formed by electrolyzing water vapour in a YSZ cell has been applied to detect NO with output signal of magnitude in millivolt or milliampere. The experimental apparatus consisted of two YSZ cells, Pt|YSZ|Pt, which served as an electrolysis cell and an oxygen sensor, respectively. A mixture of 0-3000 ppm NO and 3% H2O in argon was successively fed to the two cells at 800°C. In the upstream cell, the hydrogen formed by electrolyzing water vapour in the sample gas reacted with NO in the sample gas. In the downstream cell, the electromotive force (EMF) value was measured using air as a reference gas. The EMF value of the oxygen sensor was used as a sensor signal, when a current of 6.7 mA was applied to the electrolysis cell. The EMF signal decreased with increasing NO concentration in the sample gas. Furthermore, the current applied to the electrolysis cell was used as another sensor signal, when the EMF value of the oxygen sensor was held at 700 mV. The current signal increased with increasing NO concentration in the sample gas. © 1998 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/s0167-2738(97)00538-9

Scopus

Nonideal electromotive force of zirconia sensors for unsaturated hydrocarbon gases Reviewed

Takashi Hibino, Yoshitaka Kuwahara, Shuqiang Wang, Shiro Kakimoto, Mitsuru Sano

Electrochemical and Solid-State Letters Vol. 1 page： 197-199 1998.4

NOx detection using the electrolysis of water vapor in a YSZ cell - Part II. Electrochemical oxygen pump Reviewed

Hibino T, Kuwahara Y, Otsuka T, Ishida N, Oshima T

SOLID STATE IONICS Vol. 107 ( 3-4 ) page： 217 - 220 1998.4

NOx detection using the electrolysis of water vapour in a YSZ cell - Part I. NOx detection Reviewed

Hibino T, Kuwahara Y, Otsuka T, Ishida N, Oshima T

SOLID STATE IONICS Vol. 107 ( 3-4 ) page： 213 - 216 1998.4

NOx detection using the electrolysis of water vapor in a YSZ cell Part Ⅰ. NOx detection Reviewed

Takashi Hibino, Yoshitaka Kuwahara, T. Otsuka, N. Ishida, T. Oshima

Solid State Ionics Vol. 107 page： 213-216 1998

NOx detection using the electrolysis of water vapor in a YSZ cell. Part Ⅱ. electrochemical oxygen pump Reviewed

Takashi Hibino, Yoshitaka Kuwahara, T. Otsuka, N. Ishida, T. Oshima

Solid State Ionics Vol. 107 page： 217-220 1998

Detection of propylene under oxidizing conditions using zirconia-based potentiometric sensor Reviewed

Takashi Hibino, Shuqiang Wang, Shiro Kakimoto, Mitsuru Sano

Sensors and Actuators B Vol. 50 page： 149-155 1998

Detection of propylene under oxidizing conditions using zirconia-based potentiometric sensor Reviewed

Hibino T., Wang S., Kakimoto S., Sano M.

Sensors and Actuators, B: Chemical Vol. 50 ( 2 ) page： 149 - 155 1998

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

A sensor device detecting propylene under oxidizing conditions at high temperatures has been fabricated using a yttria-stabilized zirconia (YSZ) as the solid electrolyte. When the sample gas containing 0-500 ppm propylene and 10 vol.% O2 was fed to various metal electrodes at 600°C, the Pt, Pd and Ni electrodes had a small or negligible EMF response, but the Au electrode had a large EMF response, which was based on a mixed potential. The mixed potentials of the Au electrode for H2, CO and CH4 were very small and that for propylene was independent of the presence of water vapor and CO2. However, since this sensor was an oxygen concentration cell, the mixed potential for propylene was affected by changing the O2 concentration. This problem was appreciably solved using a one-compartment cell attached with the Au and Pt electrodes, where their sensitivities to O2 were compensated by each other. In addition, the mechanism of the mixed potential for propylene was discussed by measuring the polarization curve of the Au electrode and its catalytic activity. © 1998 Elsevier Science S.A. All rights reserved.

DOI： 10.1016/S0925-4005(98)00217-2

Scopus

Solid electrolyte HC sensor on gasoline engines Reviewed

Hibino T., Kuwahara Y., Kuroki Y., Oshima T., Inoue R., Kitanoya S., Fuma T.

Solid State Ionics Vol. 104 ( 1-2 ) page： 163 - 166 1997.12

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

A sensor for detecting CH4 in exhaust gases from gasoline engines has been constructed from two Pd|YSZ| Au cells, which are attached to each other with their Pd electrodes in the interior side of the assembly. When the sample gases consisting of CH4, O2 and H2O were fed to the sensor element at 750°C, EMF values were generated from the one cell and then compensated by pumping O2 electrochemically from the other cell. Currents applied to the latter cell linearly increased with CH4 concentration, but were not influenced by changing O2 concentration.

DOI： 10.1016/s0167-2738(97)00405-0

Scopus

Solid electrolyte HC sensor on gasoline engines Reviewed

Hibino T, Kuwahara Y, Kuroki Y, Oshima T, Inoue R, Kitanoya S, Fuma T

SOLID STATE IONICS Vol. 104 ( 1-2 ) page： 163 - 166 1997.12

Mechanism of NO decomposition in a solid electrolyte reactor by SEP method Reviewed

Hibino T., Ushiki K., Kuwahara Y.

Solid State Ionics Vol. 98 ( 3-4 ) page： 185 - 190 1997.6

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

The mechanism of the NO decomposition in the presence of excess O2, H2O and CO2 using a ceria-based oxide ionic conductor with a Pd electrode has been studied by solid electrolyte potentiometry (SEP) method. A single compartment cell for measuring PO2 , Pt|YSZ|Pt, are attached to another single compartment cell for decomposing NO, Pd|Ce0.8Sm0.2O1.9|Pd, where their working electrodes come into contact with each other. Experiments were carried out with a mixture of 2611 ppm NO, 0.1-4% O2, 0-5% H2O and 0-5% CO2 in argon at 800°C. A PO2 measurement in the neighborhood of the Pd electrode during NO decomposition confirms that the NO decomposition is initiated after the electrochemical oxygen pump is completed. A comparison of the Pd electrodes heated at 850°C with that heated at 1300°C shows that the poorer the oxygen pumping property, the better the NO decomposition. On the basis of these results, the mechanism of the NO decomposition is discussed in detail. In addition, the SEP method also gives information about the influences of the coexistent O2, H2O and CO2 on the NO decomposition.

DOI： 10.1016/s0167-2738(97)00116-1

Scopus

Mechanism of NO decomposition in a solid electrolyte reactor by SEP method Reviewed

Hibino T, Ushiki K, Kuwahara Y

SOLID STATE IONICS Vol. 98 ( 3-4 ) page： 185 - 190 1997.6

Electrochemical oxygen pump using CeO2-based solid electrolyte for NOx detection independent of O-2 concentration Reviewed

Hibino T, Ushiki K, Kuwahara Y

SOLID STATE IONICS Vol. 93 ( 3-4 ) page： 309 - 314 1997.1

Electrochemical oxygen pump using CeO<inf>2</inf>-based solid electrolyte for NOx detection independent of O<inf>2</inf> concentration Reviewed

Hibino T., Ushiki K., Kuwahara Y.

Solid State Ionics Vol. 93 ( 3-4 ) page： 309 - 314 1997.1

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

The electrochemical oxygen pump has been studied using Ceo0.8Sm0.2O1.9 as a solid electrolyte and gold metal as an electrode. The O2 concentration in the flow of a mixture of 1000 ppm NO, 1-10% O2, 5% H2O and 5% CO2 at a flow-rate of 20 ml min-1 was electrochemically controlled to a constant value of 5% by applying anodic or cathodic currents to the cell at 900°C. During oxygen pumping, NO was not electrolyzed at all and the pumping amount of oxygen obeyed Faraday's law. A potentiometic-or amperometric-type sensor for NOx when introduced into the resulting gas stream, exhibited an output signal without influence of the O2 concentration.

DOI： 10.1016/s0167-2738(96)00541-3

Scopus

Electrochemical oxygen pump using CeO2-based solid electrolyte for NOx detection independent of O2 concentration Reviewed

Takashi Hibino, Ken-ichi Ushiki, Yoshitaka Kuwahara

Solid State Ionics Vol. 93 page： 309-314 1997

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Papers - HIBINO, Takashi