研究者詳細 - 日比野　高士

論文 - 日比野　高士

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Chemical and redox stabilities of a solid oxide fuel cell with BaCe0.8Y0.2O3-alpha functioning as an electrolyte and as an anode 査読有り

Tomita Atsuko, Tsunekawa Kiyoka, Hibino Takashi, Teranishi Shinya, Tachi Yuki, Sano Mtsuru

SOLID STATE IONICS 177 巻 ( 33-34 ) 頁： 2951 - 2956 2006年11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

The operation of a solid oxide fuel cell (SOFC) based on BaCe0.8Y0.2O3-α (BCY20) at 800 °C was studied without using an anode material. A porous, Ce-rich phase with a fluorite structure was formed at a depth of approximately 10 μm from the BCY20 surface by heat treatment at 1700 °C. This was due to the vaporization of BaO from the BCY20 surface. This treatment improved the cell performance and chemical stability to CO2 because the Ce-rich phase functioned as an electrically conducting and protective layer. The heat-treated BCY20 also had better chemical and redox stabilities over a Ni-Ce0.8Sm0.2O1.9 (SDC) cermet anode attached to the SDC electrolyte. The cell with the heat-treated BCY20 operated well on unhumidified methane, ethane, propane, and butane without carbon deposition, while the cell with the Ni-SDC cermet anode degraded within a few hours. Moreover, the BCY20 showed higher tolerance to 10 ppm H2S and stability over 20 times redox cycling in comparison to the Ni-SDC cermet anode. © 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ssi.2006.08.031

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Chemical and redox stabilities of a solid oxide fuel cell with BaCe0.8Y0.2O3-alpha functioning as an electrolyte and as an anode 査読有り

Atsuko Tomita, Kiyoka Tsunekawa, Takashi Hibino, Shinya Teranishi, Yuki Tachi, Mitsuru Sano

Solid State Ionics 177 巻 ( 33-34 ) 頁： 2951-2956 2006年11月

Proton conduction in In3+-doped SnP2O7 at intermediate temperatures 査読有り

Masahiro Nagao, Toshio Kamiya, Pilwon Heo, Atsuko Tomita, Takashi Hibino, Mitsuru Sano

Journal of The Electrochemical Society 153 巻 ( 8 ) 頁： A1604-A1609 2006年8月

Comparative performance of anode-supported SOFCs using a thin Ce0.9Gd0.1O1.95 electrolyte with an incorporated BaCe0.8Y0.2O3– layer in hydrogen and methane 査読有り

Atsuko Tomita, Shinya Teranishi, Masahiro Nagao, Takashi Hibino, Mitsuru Sano

Journal of The Electrochemical Society 153 巻 ( 6 ) 頁： A956-A960 2006年6月

Intermediate-temperature NOx sensor based on an in3+-doped SnP2O7 proton conductor 査読有り

Masahiro Nagao, Yosuke Namekata, Takashi Hibino, Mitsuru Sano, Atsuko Tomita

Electrochemical and Solid-State Letters 9 巻 ( 6 ) 頁： H48-H51 2006年6月

Performance of an intermediate-temperature fuel cell using a proton-conducting Sn0.9In0.1P2O7 electrolyte 査読有り

Pilwon Heo, Hidetaka Shibata, Masahiro Nagao, Takashi Hibino, Mitsuru Sano

Journal of The Electrochemical Society 153 巻 ( 5 ) 頁： A897-A901 2006年5月

*A proton-conducting In3+-doped SnP2O7 electrolyte for intermediate-temperature fuel cells 査読有り

Masahiro Nagao, Akihiko Takeuchi, Pilwon Heo, Takashi Hibino, Mitsuru Sano, Atsuko Tomita

Electrochemical and Solid-State Letters 9 巻 ( 3 ) 頁： A105-A109 2006年3月

Electrochemical reduction of NOx at intermediate temperatures using a proton-conducting In3+-doped SnP2O7 electrolyte 査読有り

Masahiro Nagao, Takeshi Yoshii, Takashi Hibino, Mitsuru Sano, Atsuko Tomita

Electrochemical and Solid-State Letters 9 巻頁： J1-J4 2006年2月

A high performance Pt-free anode for intermediate-temperature fuel cells 査読有り

Heo P., Nagao M., Sano M., Hibino T.

ECS Transactions 3 巻 ( 1 ) 頁： 453 - 458 2006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：ECS Transactions

Proton exchange membrane fuel cells (PEMFCs) are among the most promising power sources for vehicular and residential applications because of their clean and efficient energy conversion. However, these fuel cells require expensive Pt-based electrodes, which raise the cost of fuel-cell systems considerably. Here, we propose an approach to solving this problem by combining a molybdenum carbide (Mo2C) catalyst with an In3+-doped SnP 2O7 electrolyte. The resulting fuel cell can operate in the temperature range of 150 to 300°C, providing the high catalytic activity of Mo2C for electrochemical hydrogen oxidation, which is comparable to that of a Pt anode catalyst. Another important advantage of this fuel cell is that the Mo2C anode catalyst showed perfect tolerance to 10%CO. copyright The Electrochemical Society.

DOI： 10.1149/1.2356166

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A proton-conducting In3+-doped SnP2O7 electrolyte for intermediate-temperature fuel cells 査読有り

Nagao M, Takeuchi A, Heo P, Hibino T, Sano M, Tomitab A

ELECTROCHEMICAL AND SOLID STATE LETTERS 9 巻 ( 3 ) 頁： A105 - A109 2006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

We report proton conduction in In3+ -doped Sn P2 O7 in the temperature range from 100 to 300°C, and the performance of a H2 -air fuel cell using this material as the electrolyte. The proton conductivity of In3+ -doped Sn P2 O7 was more than 10-1 S cm-1 between 125 and 300°C, and a conductivity value of 1.95× 10-1 S cm-1 was achieved at 250°C. The resulting fuel cell exhibited a reasonable power density of 264 mW cm-2 at 250°C (electrolyte thickness=0.35 mm), together with perfect tolerance toward 10% CO and good thermal stability in unhumidified conditions. © 2006 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.2159298

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Comparative performance of anode-supported SOFCs using a thin Ce0.9Gd0.1O1.95 electrolyte with an incorporated BaCe0.8Y0.2O3-alpha layer in hydrogen and methane 査読有り

Tomita A, Teranishi S, Nagao M, Hibino T, Sano M

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 153 巻 ( 6 ) 頁： A956 - A960 2006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：Journal of the Electrochemical Society

Multilayered Ce0.9 Gd0.1 O1.95 Ba Ce0.8 Y0.2 O3-α Ce0.9 Gd0.1 O1.95 (GDCBCYGDC) electrolytes were prepared by tape casting on a Ni- Ce0.8 Sm0.2 O1.9 anode support. The overall electrolyte thickness ranged from 30 to 35 μm, including a 3 μm thick BCY layer. When the multilayered electrolyte cell was tested with hydrogen at the anode and air at the cathode in the temperature range of 500-700°C, it yielded open-circuit voltages (OCVs) of 846-1024 mV, which were higher than the OCVs of 753-933 mV obtained for a single-layered GDC electrolyte cell under the same conditions. The corresponding peak power densities reached 273, 731, and 1025 mW cm-2 at 500, 600, and 700°C, respectively. The multilayered electrolyte cell could also be applied to direct methane solid oxide fuel cell (SOFC) and single-chamber SOFC operating in a mixture of methane and air. These SOFCs yielded OCVs of 880-950 mV and reasonable power densities without coking. © 2006 The Electrochemical Society.

DOI： 10.1149/1.2186184

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Electrochemical reduction of NOx at intermediate temperatures using a proton-conducting In3+-doped SnP2O7 electrolyte 査読有り

Nagao M, Yoshii T, Hibino T, Sano M, Tomita A

ELECTROCHEMICAL AND SOLID STATE LETTERS 9 巻 ( 2 ) 頁： J1 - J4 2006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

In 3+-doped SnP 2O 7 was used as the electrolyte in an electrochemical cell for the reduction of NO between 150 and 300°C in the presence of excess O 2. NO was reduced to N 2 at a Pt/C cathode when current was applied to the cell. The electrocatalytic activity of the cathode for the reduction of NO was shown to be highest at 250°C. The addition of Ba species (an oxide/carbonate mixture) to the cathode further promoted the reduction of NO by adsorbing NO more selectively than O 2 on the surface. A resulting current efficiency of 5.81% was achieved in a 2% O 2 atmosphere. © 2005 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.2149213

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Intermediate-temperature NOx sensor based on an In3+-doped SnP2O7 proton conductor 査読有り

Nagao M, Namekata Y, Hibino T, Sano M, Tomita A

ELECTROCHEMICAL AND SOLID STATE LETTERS 9 巻 ( 6 ) 頁： H48 - H51 2006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 potentiometric NOx sensor using a proton-conducting Sn0.9 In0.1 P2 O7 electrolyte with a PtRhC working electrode was fabricated to study sensing properties for NO and N O2 at intermediate temperatures. The sensor showed electromotive force (emf) responses to changes in NO and N O2 concentrations. Interestingly, the emf values for both NO and N O2 increased in the positive direction with increasing gas concentration. The sensing mechanism was shown to be based on a mixed potential at the working electrode through measurements of the polarization curves of NO or N O2 and water vapor. © 2006 The Electrochemical Society.

DOI： 10.1149/1.2193073

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Performance of an intermediate-temperature fuel cell using a proton-conducting Sn0.9In0.1P2O7 electrolyte 査読有り

Heo P, Shibata H, Nagao M, Hibino T, Sano M

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 153 巻 ( 5 ) 頁： A897 - A901 2006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：Journal of the Electrochemical Society

Performance of a fuel cell using Sn0.9 In0.1 P2 O7 as the electrolyte was evaluated in the temperature range of 150-300°C under unhumidified conditions. The IR drop and electrode overpotential of the cell were measured separately by the current interruption method. The dc conductivity values of the electrolyte between 150 and 300°C, estimated from the IR drop, were comparable to the ac conductivity values (1.48× 10-1 -1.95× 10-1 S cm-1) of the electrolyte. The cell performance was improved by forming an intermediate layer consisting of Sn0.9 In0.1 P2 O7 and PtC catalyst powders at the interface between the electrolyte and cathode, which significantly reduced the cathode polarization. As a result, the peak power density reached 264 mW cm-2 at 250°C using the 0.35-mm -thick electrolyte. The present fuel cell also showed high stability at low relative humidities (p H2 O ≈0.0075 atm) and 10% CO concentration. © 2006 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.2183927

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Proton conduction in In<sup>3+</sup>-doped SnP<inf>2</inf>O<inf>7</inf> with various P/(Sn+In) ratios 査読有り

Nagao M., Heo P., Kamiya T., Hibino T., Sano M., Tomita A.

ECS Transactions 2 巻 ( 10 ) 頁： 43 - 49 2006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：ECS Transactions

A proton conducting, 10 mol% In3+-doped SnP2O 7 (Sn0.9In0.1 P2O7) was characterized by thermogravimetric analysis (TGA), transmission electron microscope (TEM) measurement, and electrochemical techniques. We prepared Sn0.9In0.1P2=x07±x samples with various P/(Sn+In) molar ratios from 1.7 to 2.6 through the control of the amount of phosphoric acid at the preparation process in order to examine electrochemical properties and thermal stabilities. Sn0.9In 0.1P2O7 with a stoichiometric P/(Sn+In) molar ratio of 2.0 showed a proton conductivity of about 0.19 S cm-1 at 250°C under unhumidified conditions. When the P/(Sn+In) molar ratios were over 2.0, the formation of amorphous layer composed of phosphorus compounds were observed over the surface of Sn0.9In0.1P 2O7 particles. The proton conductivity slightly increased with increasing the P/(Sn+In) molar ratios from 2.0 to 2.6. It is considered that the amorphous layer enhanced the proton conductivity by surface conduction. On the other hand, the thermal stability of this amorphous layer during heating-cooling cycle was not enough high to apply to electrochemical devises. As a result, it is important to prepare Sn0.9In0.1P 2O7 with the P/(Sn+In) molar ratio of 2.0 to achieve both sufficient proton conductivity and high thermal stability. Copyright The Electrochemical Society.

DOI： 10.1149/1.2408942

Scopus

Proton conduction in In3+-doped SnP2O7 at intermediate temperatures 査読有り

Nagao Masahiro, Kamiya Toshio, Heo Pilwon, Tomita Atsuko, Hibino Takashi, Sano Mitsuru

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 153 巻 ( 8 ) 頁： A1604 - A1609 2006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：Journal of the Electrochemical Society

SnP2 O7 -based proton conductors were characterized by Fourier transform infrared spectroscopy (FTIR), temperature-programmed desorption (TPD), X-ray diffraction (XRD), and electrochemical techniques. Undoped SnP2 O7 showed overall conductivities greater than 10-2 S cm-1 in the temperature range of 75-300°C. The proton transport numbers of this material at 250°C under various conditions were estimated, based on the ratio of the electromotive force of the galvanic cells to the theoretical values, to be 0.97-0.99 in humidified H2 and 0.89-0.92 under fuel cell conditions. Partial substitution of In3+ for Sn4+ led to an increase in the proton conductivity (from 5.56× 10-2 to 1.95× 10-1 S cm-1 at 250°C, for example). FTIR and TPD measurements revealed that the effects of doping on the proton conductivity could be attributed to an increase in the proton concentration in the bulk Sn1-x Inx P2 O7. The deficiency of P2 O7 ions in the Sn1-x Inx P2 O7 bulk decreased the proton conductivity by several orders of magnitude, which was explained as due to a decrease in the proton mobility rather than the proton concentration. The mechanism of proton incorporation and conduction is examined and discussed in detail. © 2006 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.2210669

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

Atsuko Tomita, Takashi Hibino, Mitsuru Sano

Electrochemical and Solid-State Letters 8 巻頁： A333-A336 2005年7月

Improvement of a reduction-resistant Ce0.8Sm0.2O1.9 electrolyte by optimizing a thin BaCe1-xSmxO3-alpha layer for intermediate-temperature SOFCs 査読有り

Hirabayashi D, Tomita A, Teranishi S, Hibino T, Sano M

SOLID STATE IONICS 176 巻 ( 9-10 ) 頁： 881 - 887 2005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

Sm3+-doped ceria (SDC) electrolytes growing various BaCe 1-xSmxO3-α (BCS) layers over the electrolyte surface were investigated in order to develop high-performance solid oxide fuel cells in the temperature range of 600-900°C. The BCS layers were grown by a solid-state reaction of the electrolyte substrate and a BaO film spin-coated previously over the substrate surface under different preparation conditions. The thickness of the layer was controlled with a precision of micrometer by the number of coats. The composition of the layer was optimized by the sintering temperature. As a result, a dense and microcrack-free BCS layer was formed over the electrolyte surface, and the junction between the electrolyte and layer was almost homogeneous. A hydrogen-air fuel cell with the improved electrolyte showed open-circuit voltages (OCVs) ranging from 857 (900°C) to 1002 mV (600°C). Furthermore, the peak power densities of this fuel cell were higher than those of a fuel cell with an uncoated SDC electrolyte. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ssi.2004.12.007

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Improvement of a reduction-resistant Ce0.8Sm0.2o1.9 electrolyte by optimizing a thin BaCe1-xSmxO3-α layer for intermediate-temperature SOFCs 査読有り

Daisuke Hirabayashi, Atsuko Tomita, Shinya Teranishi, Takashi Hibino, Mitsuru Sano

Solid State Ionics 176 巻頁： 881-887 2005年3月

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

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

Electrochemical and Solid-State Letters 8 巻 ( 1 ) 頁： A63-A65 2005年1月

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