成果報告書詳細
管理番号20110000001103
タイトル*平成22年度中間年報 固体高分子形燃料電池実用化推進技術開発 次世代技術開発 広い温度範囲で無加湿運転が可能な固体高分子形燃料電池の電解質および電極設計
公開日2011/10/12
報告書年度2010 - 2010
委託先名国立大学法人横浜国立大学
プロジェクト番号P10001
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 無加湿中温形燃料電池を開発するために、非水系のプロトン伝導体であるイオン液体に注目している。これまでにdiethylmethylammonium trifluoromethanesulfonate ([dema][TfO])が優れたバルク特性(無水状態でのイオン伝導度(σ) = 55 mS/cm at 150 ℃、融点(Td) = ~6 ℃、熱分解温度(Td) = 360 ℃)と燃料電池電極反応に対する高い活性(150 ℃無加湿における開回路電圧(OCV) = 1.03 V)を見出した。さらに、アンモニウム型としたスルホン酸化ポリイミド(SPI)をマトリックスポリマーとして複合膜化を行い、120 ℃における無加湿発電試験で240 mA cm~2の電流を取り出すことに成功した。本年度は、さらなる発電特性の向上を目指し、プロトン性イオン液体の特性向上、及び、触媒層の探索を中心に研究を遂行した。
英文要約Title: Strategic Development of PEFC Technologies for Practical Application, Development of Technology for Next-generation Fuel Cells, Electrolyte and Electrode Design for Non-humidified Wide Temperature Range Fuel Cell (FY2010-FY2011) FY2010 Annual Report
In this year, in order to apply diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], to non-humidified intermediated temperature fuel cell as electrolyte, the following research subjects have been explored. (1) Protic ionic liquids (PILs) that have superior bulk properties to [dema][TfO] were investigated. It was revealed that PILs from organic strong base (DBU) and super strong acid (TfOH and HNf2) exhibits excellent thermal stability (decomposition temperature > 400 °C) comparable to typical aprotic ionic liquids, while that from tertiary amine with allyl groups exhibits relatively low viscosity with better ionic conductivity. (2) By molecular dynamics (MD) simulation, bulk structures of various kinds of PILs were estimated at 30 °C. Further, from the standard enthalpy of formation for each conformation, entropy of each PIL was calculated. It was found that the magnitudes of melting points have a clear relationship with entropy of the bulk state: With increasing entropy of the bulk state, melting points tend to decrease. This result suggests that MD simulation is convenient method for estimating melting points of PILs. (3) In order to improve the three phase interface in catalyst layer that is formed by releasing of [dema][TfO] from [dema][TfO]/SPI composite membrane, acid treatment of carbon black in catalyst layer was conducted. It was found that releasing amount of [dema][TfO] clearly increased by the treatment with mixed acid (sulfuric acid + nitric acid). Further, the effect of additional loading of [dema][TfO] with 5mol% H3PO4 on surface of [dema][TfO]/SPI composite membrane was confirmed. By impedance analysis of cell, it was revealed that interface resistance drastically decreased by loading on the surface. (4) Non-humidifying operation of hydrogen/oxygen fuel cells using [dema][TfO]/SPI composite membranes and homemade ionomer free GDLs was demonstrated. At 120 °C, the current density of 400 mA/cm^2 was achieved.
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