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Devrelopment of new gas diffusion electrodes and materials for high performance and long-life phosphoric acid fuel cells

Research Project

Project/Area Number 07555269
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 工業物理化学
Research InstitutionYamanashi University

Principal Investigator

WATANABE Masahiro  Yamanashi Univ., Fac.of Engineering, Professor, 工学部, 教授 (00020412)

Co-Investigator(Kenkyū-buntansha) HARA Noriaki  Tanaka Kikinzoku Kogyo, Technical Center, Research Fellow, 技術開発センター, 研究員
TSURUMI Kazunori  Tanaka Kikinzoku Kogyo, Technical Center, Project Leader, 技術開発センター, プロジェクトリーダー
IGARASHI Hiroshi  Yamanashi Univ., Fac.of Engineering, Research Assistant, 工学部, 助手 (40242044)
UCHIDA Hiroyuki  Yamanashi Univ., Fac.of Engineering, Associate Professor, 工学部, 助教授 (20127434)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1996: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1995: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsFuel Cell / Phosphoric Acid Fuel Cell / Gas Diffusion Electrode / Fluorinated Polyethylene / Hydrophobic Material / Electrocatalyst / リン酸型燃料電池寿命 / 電極の濡れ / フッ化ポリエチレン
Research Abstract

In order to develop phosphoric acid fuel cells (PAFCs), it is essential to improve performance and lifetime of gas diffusion electrodes. We have proposed a new type of electrode, which is based on the concept that the functions of the electrocatalyst layr in the electrode are allotted completely to hydrophilic Pt/carbon black (Pt/CB) as the electrolyte network and CB strongly wet-proofed by fluorinated polyethylene (FPE/CB) as the gas supplying network. In this research, we investigated 1) the preparation of FPE/CB with high wet-proofing property, 2) the relation between the performances of the proposed electrode and its composition, and 3) an establishment of the method of accelerated life-time test for the electrodes. We have obtained the following results.
1.Fluorination of polyethylene films with F_2 gas was examined by using QCM.Based on the kinetic data obtained, we have determined the optimum condition for preparing FPE/CB and have succeeded to fabricate it by a bench-scale rotary-kilm reactor.
2.We examined the cathode performances as a function of the mixing ratio of Pt/CB,FPE/CB and binder PTFE (Teflon). The cathode optimized in the structure with the new FPE/CB exhibited a high performance for oxygen reduction compared with the conventional one using PTFE owing to the improved catalyst utilization and gas permeability.
3.We have developed a new method for electrochemical evaluation of fill-level with electrolyte in the electrode in PAFCs, and also an automatic accelerated life-time testing system. It was demonstrated using this system that the optimized new cathode exhibited better properties of catalyst utilization and gas permeability than the conventional one over the accelerated test period, corresponding to a normal operation time of several thousands hours.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Noriaki HARA: "In-situ kinetic studies on direct fluorination of thin polyethylene films with QCM" Bulletin of the Chemical Society of Japan. 68. 1232-1238 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiro WATANABE: "Design of high performance and long-life gas diffusion electrodes using carbon black wet-proofed by thin-film-coating with fluorinated polyethylene" Proceeding of the 2nd International Fuel Cell Conference. 2. 47-50 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Noriaki HARA: "An advanced gas diffusion electrode for high performance phosphoric acid fuel cells" Journal of electroanalytical Chemistry. 413. 81-88 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiro WATANABE: "Electrochemical evaluation of fill-level with electrolyte in gas diffusion electrodes at phosphoric acid fuel cells" Denki Kagaku. 64. 460-461 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Noriaki Hara: "In-situ kinetic studies on direct fluorination of thin polyethylene films with QCM" Bulletin of the Chemical Society of Japan. 68. 1232-1238 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiro Watanabe: "Design of high performance and long-life gas diffusion electrodes using carbon black wet-proofed by thin-film-coating with fluorinated polyethylene" Proceedings of the 2nd International Fuel Cell Conference. 2. 47-50 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Noriaki Hara: "An advanced gas diffusion electrode for high performance phosphoric acid fuel cells" Journal of Electroanalytical Chemistry. 413. 81-88 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiro Watanabe: "Electrochemical evaluation of fill-level with electrolyte in gas diffusion electrodes at phosphoric acid fuel cells" Denki Kagaku. 64. 460-461 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masahiro WATANABE: "Electrochemical Evaluation of Fill-Level with Electrolyte in Gas Diffusion Electrodes at Phosphoric Acid Fuel Cells" DENKI KAGAKU. 64,No.6. 460-461 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Noriaki HARA: "An Advanced Gas-Diffusion Electrode for High Performance Phosphoric Acid Fuel Cells" Journal of Electroanalytical Chemistry. 413. 81-88 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Takashi KITAI: "Evaluation of the Performance Degradation at PAFC Effect of Electrolyte Fill-Level on Electrode Performance" '96 Fuel Cell Seminar. 234-237 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Masahiro WATANABE: "Experimental Analysis of Elemental Factors Controlling the Life PAFCs" '96 Fuel Cell Seminar. 772-775 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kohjiro HARA: "High Efficiency Electrochemical Reduction of Carbon Dioxide under High Pressure on a Gas Diffusion Electrode Containing Pt Catalysts" J. Electrochem. Soc.142. L57-L59 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Noriaki HARA: "An Adranced Gas Diffusion Electrode for High Performance Phosphric Acid Fuel Cells" J. Electroanal. Chem.in press. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Noriaki HARA: "Desigh of High Performance and Long-Life Gas Diffusion Electrodes Using Carbon Black Wet-Proofed by Thin-Film-Coating with Fluorinated Polythylene" The 2nd International Fuel Cell Conference. 2-03. 47-50 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 平塚秀和: "ガス拡散電極特性を支配する触媒利用率と電極漏れの評価法の検討" '95電気化学会秋季大会. 2J-06. 198- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Masahiro WATANABE: "Electrochemical Evaluation of Fill-Level with Electrolyte in Gas Diffusion Electrodes at Phosphoric Acid Fuel Cells" DENKIKAGAKU. (in press). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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