Faculty Profiles - NAGAO, Masahiro

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

Scopus

A Proton-Conducting In^<3+>-Doped SnP_2O_7 Electrolyte for Intermediate Temperature Fuel Cells Reviewed

長尾征洋

Electrochemical and Solid-State Letters 9 2006

Proton conduction in In^<3+>-doped SnP_2O_7 at intermediate temperatures Reviewed

長尾征洋

Journal of The Electrochemical Society 153 2006

Intermediate-temperature NOx sensor based on an In^<3+>-doped SnP_2O_7 proton conductor Reviewed

長尾征洋

Electrochemical and Solid-State Letters 9 2006

Electrochemical reduction of NO_x at intermediate temperatures using a proton-conducting In^<3+>-Doped SnP_2O_7 electrolyte Reviewed

長尾征洋

Electrochemical and Solid-State Letters 9 2006

「総説」MP2O7系固体電解質のプロトン導電性とその応用

長尾征洋, 冨田衷子, 日比野高士, 佐野充

電気化学および工業物理化学 Vol. 73 page： 846-850 2005

Single-Chamber SOFCs with a Ce0.9Gd0.1O1.95 Electrolyte Film for Low-Temperature Operation Reviewed

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

Electrochemical and Solid-State Letters Vol. 8 ( 1 ) page： A63-A65 2004.11

Language：English Publishing type：Research paper (scientific journal)

Single-chamber solid oxide fuel cells (SOFCs) with an anode-supported Ce0.9Gd0.1O1.95 electrolyte were operated in a mixture of butane and air at furnace temperatures of 200-300°C. The electromotive force (emf) of the cell and the voltage drop were strongly influenced by the catalytic activity of the anode for the partial oxidation of butane. The promotion of hydrogen formation by the addition of Ru to the anode caused an increase in the emf and a reduction in the voltage drop. As a result, stable power densities of 44 and 176 mW cm–2 were obtained at 200 and 300°C, respectively.

Design of a Reduction-Resistant Ce0.8Sm0.2O1.9 Electrolyte Through Growth of a Thin BaCe1–xSmxO3– Layer over Electrolyte Surface Reviewed

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

Electrochemical and Solid-State Letters Vol. 7 ( 10 ) page： A318-A320 2004.9

Language：English Publishing type：Research paper (scientific journal)

A method that can block off electronic current through a samaria-doped ceria (SDC, Ce0.8Sm0.2O1.9) electrolyte is proposed. A thin BaCeO3-based layer 12 µm thick was grown by a solid-state reaction of the electrolyte substrate and a BaO film deposited previously over the substrate surface at 1500°C. A homogeneous junction between the layer and the electrolyte was formed, thus allowing no delamination and cracking of the layer. Tolerance of this layer to CO2 was high enough to suppress decomposition into BaCO3 and CeO2. Open-circuit voltages of a hydrogen-air fuel cell with the coated SDC electrolyte were near 1 V or more in the range of 600-950°C. The resulting peak power density was higher than that of a fuel cell with an uncoated SDC electrolyte.

Solid oxide fuel cells operating without using an anode material Reviewed

Daisuke Hirabayashi, Atsuko Tomita, Munuel E. Brito, Takashi Hibino, Ushio Harada, Masahiro Nagao, Mitsuru Sano

Solid State Ionics Vol. 168 ( 1 ) page： 23-29 2004.3

Language：English Publishing type：Research paper (scientific journal)

We proposed a new type of solid oxide fuel cell (SOFC) operating without using an anode material, where the anode was spontaneously formed by reduction of the electrolyte surface under reducing gas conditions. A BaCe0.76Y0.20Pr0.04O3−α electrolyte most successfully met this criterion. This material showed high mixed protonic–electronic conduction, whereas the open circuit voltage (OCV) of the cell was slightly lower than the theoretical value. The resulting SOFC exhibited reasonable fuel cell performances together with a good stability to thermal and redox cyclings and high resistance to carbon deposition up to 800 °C for dry methane, ethane, and propane.

Author Keywords: Solid oxide fuel cells; BaCe0.76Y0.20Pr0.04O3−α; Anode material

SOFC-type microreactors that generate hydrogen for PEFC applications Reviewed

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

Solid State Ionics Vol. 174 page： 9-13 2004

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Papers - NAGAO, Masahiro