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2005 Fiscal Year Final Research Report Summary

Optimization of structure and design of membrane electrode assembly for DMFC

Research Project

Project/Area Number 13134201
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionGunma University

Principal Investigator

NAKAGAWA Nobuyoshi  Gunma University, Faculty of Engineering, Department of Biological and Chemical Engineering, Professor, 工学部, 教授 (70217678)

Co-Investigator(Kenkyū-buntansha) KATATAMA Yashushi  Keio University, Faculty of Science and Technology, Department of Applied Chemistry, Assistant Professor, 理工学部, 専任講師 (50286639)
FUKUNAGA Hiroshi  faculty of textile science and technology, department of fine materials engineering, Research Associate, 繊維学部, 助手 (30313844)
NAKAZATO Tsutomu  faculty of engineering, gunma university, department of biological and chemical engineering, Research Associate, 工学部, 助手 (30323330)
Project Period (FY) 2001 – 2005
KeywordsDirect methanol fuel cell / Electrode / Solid polymer electrolyte / Methanol / catalyst / Energy conversion / Ionic liquid / Mesoporous carbon
Research Abstract

30% enhancement in power output was successfully achieved by an employment of Pt thin film addition on to the electrode/electrolyte interface with a sputtering technique. The similar approach was conducted with Pt-Ru binary sputtering on the anode interface, and an optimum composition of the binary catalyst and also the optimum amount for higher power output were made clear. As a result of these investigations, DMFC power output with 0.22W/cm^2 was achieved. A condensed catalyst thin layer with Pt and Pt-Ru black catalyst on cathode and anode, respectively, was designed and prepared based on the above investigations, and we could successfully demonstrated a DMFC with a power output as high as 0.35W/cm^2.
By employing a novel electrode structure with a porous carbon plate, reduction of the methanol crossover to 1/3-1/10 was successfully attained. And then, it made DMFC operation with high concentration methanol like 15-17M possible.
For a practical MEA using Nafion 117 and 112, methanol crossover as a function of temperature, methanol concentration and current density was evaluated, and based on this, an empirical equation to calculate methanol crossover was proposed.
The anode overvoltage was successfully reduced by the addition of TiO2, 8%, to the catalyst layer.
As a novel solid electrolyte for high temperature, 200℃, and low humidity, Nafion impregnated with an ionic liquid, i.e., MPPTFSI etc., and a proton-containing inorganic compounds with NASICON-type structures were successfully prepared. The former showed electric conductivity 10^<-2> Scm^<-1> at 200℃, and suggested a proton conduction.
A novel catalyst employing mesoporous carbon particles as support of Pt-Ru catalyst was prepared. It was succeeded to obtain fine particles with several nano-meter in size and highly distributed on the surface of the mesoporous carbon particles.

  • Research Products

    (11 results)

All 2006 2005 2004 2003 Other

All Journal Article (9 results) Book (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Methanol crossover controlled by a porous carbon plate as a support2006

    • Author(s)
      N.Nakagawa, K.Kamata, A.Nakazawa, M.Ali Abdelkareem, K.Sekimoto
    • Journal Title

      Electrochemistry 74

      Pages: 221-225

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Reduction of methanol crossover by a Pt film directly sputtered on Nafion membrane2005

    • Author(s)
      Y.K.Xiu, K.Kamata, T.Ono, T.Nakazato, K.Kobayashi, N.Nakagawa
    • Journal Title

      Electrochemistry 73

      Pages: 67-70

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Road Map of DMFC Technology (Book)2005

    • Author(s)
      N.Nakagawa
    • Journal Title

      Reliable Energy Road Map(Kagaku-Kougyou Publishing Co.)

      Pages: 394

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Impedance of vapor feed direct methanol fuel cells polarization dependence of elementary processes at the anode2004

    • Author(s)
      H.Fukunaga, T.Ishida, N.Teranishi, C.Arai, K.Yamada
    • Journal Title

      Electrochimica Acta 49

      Pages: 2123-2129

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Electrochemical Reduction of Oxygen in Some Hydrophobic Room-temperature Molten Salt Systems2004

    • Author(s)
      Y.Katayama, H.Onodera, M.Yamagata, T.Miura
    • Journal Title

      J.Electrochem.Soc 151

      Pages: A59-A63

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Performance of a DMFC with a sputtered Pt layer on the electrode/electrolyte interface of the anode2004

    • Author(s)
      Y.K.Xiu, N.Nakagawa
    • Journal Title

      J.Electrochem.Soc. 151

      Pages: A1483-A1488

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Impedance of vapor feed direct methanol fuel cells-polarization dependence of elementary processes at the anode2004

    • Author(s)
      H.Fukunaga, T.Ishida, N.Teranishi, C.Arai, K.Yamada
    • Journal Title

      Electrochimica Acta 49

      Pages: 2123-2129

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Electrochemical Reduction of Oxygen in Some Hydrophobic Room-temperature Molten Salt Systems2004

    • Author(s)
      Y.Katayama, H.Onodera, M.Yamagata, T.Miura
    • Journal Title

      J.Electrochem.Soc. 151

      Pages: A59-A63

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Performance of a Direct Methanol Fuel Cell Operated at Atmospheric Pressure2003

    • Author(s)
      N.Nakagawa, Y.Xiu
    • Journal Title

      J.Power Sources 118(1-2)

      Pages: 248-255

    • Description
      「研究成果報告書概要(和文)」より
  • [Book] "直接メタノール型燃料電池の技術ロードマップ"骨太のエネルギーロードマップ2005

    • Author(s)
      中川紳好(分担)
    • Total Pages
      394
    • Publisher
      化学工業社
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] 直接液体型燃料電池

    • Inventor(s)
      中川 紳好, 他4名
    • Industrial Property Rights Holder
      群馬大, 三菱鉛筆(株)
    • Industrial Property Number
      特願2005-266971
    • Filing Date
      特願20050000-266971
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2008-05-27  

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