成果報告書詳細
管理番号20150000000675
タイトル*平成26年度中間年報 エネルギー・環境新技術先導プログラム ナノカーボンハイブリッドを素材とした低コスト超高耐久性次世代燃料電池の実現
公開日2015/9/1
報告書年度2014 - 2014
委託先名国立大学法人九州大学 株式会社トクヤマ ADEKA株式会社、ナノフロンティアテクノロジー株式会社
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title:Development of highly durable low-cost polymer electrolyte fuel cell based on nanocarbon-hybrid (FY2014-FY2015) FY2014Annual Report

Pt has received unremitting interest in the proton-exchange polymer electrolyte fuel cell (PEFC) technology as electrocatalysts for both the hydrogen oxidation and oxygen reduction reactions. However high cost limits its application and the reduction of the amount of Pt in the catalyst is required. To reduce the usage of Pt, arranging Pt as shell on proper metal core is promising “core-shell approach”. Among various metal, we chose Pd as a core metal due to the stability under strong acidic condition in PEFC. In this study, we utilized polybenzimidazole (PBI) as a polymeric anchor to load Pd-Pt core-shell nanoparticles on to the surface of carbon nanotube.
Extension of the temperature range of the PEFC is one of the important issue for future PEFC since compared to low-temperature PEFC, for example Nafion, it is expected to show higher activity and efficiency. As the electrolyte for such PEFC, we chose poly(vinylphosphonic acid) (PVPA) since it shows a high proton conductivity due to a very high concentration of phosphonic acid units in the main chain. However, the electrode catalyst containing PVPA as the electrolyte showed large over potential in the area of low current density in our previous research. This fiscal year, we explored the new preparation method to lower this over potential and investigated the catalytic performance by electrochemical techniques and found the amount of the ionomer critically affected the overpotential.Toward anion exchange type fuel cells for next generation based on carbon nanotubes, instruments for membrane electrode assembly (MEA) fabrication have been installed and maintained. Anion exchange membranes for the study were also prepared by cutting out from the rolls.Graphene was prepared from a lo-cost graphite, and then the material was coated with PBI. The fundamental electrochemical properties of the obtained composites were measured, while the value did not reach the target one. Preliminary experiment for the preparation of high electric conduction and high performance carbon paste for a new fuel cell separator was carried out using several carbon materials.
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