成果報告書詳細
管理番号20090000000014
タイトル*平成20年度中間年報 固体高分子形燃料電池実用化戦略的技術開発 要素技術開発 高温熱利用型MEAの研究開発
公開日2010/6/5
報告書年度2008 - 2008
委託先名三菱電機株式会社
プロジェクト番号P05011
部署名燃料電池・水素技術開発部 燃料電池グループ
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 (研究開発の概要) PEFCシステムが次世代省エネ型給湯機として競争力を有するには、熱源機としての基本機能である貯湯温度の高温化、即ちPEFCの高温動作化が不可欠である。高温であるほど排熱利用が有利になり、さらには熱駆動型の冷熱源の開発と融合させれば、温排水の冷熱源への展望も拓ける。この視点より本研究では、80℃以上の貯湯を可能にするPEFCシステムのための耐久性と性能を備えた高温熱利用型MEAの要素技術開発を行なう。
平成20年度、高耐久・高性能MEA開発については、アノード低加湿環境に対応すべく生成水をカソードからアノードへ逆拡させる撥水化MPLを試作してセル評価を実施し、基本機能を検証した。また導電助剤の添加した非カーボン系酸化物担体触媒を開発し、セル性能を大幅に向上させることに成功した。MEAの湿度環境開発では、従来の約1.9倍となる15℃の温度勾配を有するセパレータ構造の開発に成功した。さらに、セル面で仕様の異なるMEAを用いたスタックを開発し、動作温度85℃でも安定な性能が得られる目処が得られた。
英文要約Title: Strategic Development of PEFC Technologies for Practical Application Development of Elemental Technology Development of a High Temperature Type MEA for Efficient Heat Use (FY2005-FY2007) FY2008 Annual Report
Elemental technological development of a high temperature type MEA for efficient heat use with a high endurance and performance has been done. 1. Development of MEA with High endurance and performance. A relative humidity in the cell decreases when the PEFC is operated at high temperature. So, there is a problem that the electrolyte is dried. Then, in order to reverse-diffuse the generated water by the cell reaction to anode, a new structure of MEA was investigated. It was developed the structure to insert the water repellency MPL that block the exhaust of the generated water to the cathode passage side so as to promote the back diffusion. After a new MEA was made with the MPL permeability of water was evaluated. It was confirmed that the MPL with a high repellency showed the tendency with a high permeate pressure necessary for the exhaust of water. As the result of single cell test under the operating temperature of 85℃ and the cathode gas dew point of 80℃, the cell with a high repellency MPL maintained high performance under the anode low humidifying condition. In addition, the low humidifying specification MEA that combined the back diffusion MEA structure with the high water retentivity electrode was made. Since the cell test was done at the operating temperature of 85℃, in anode dew point of 70℃ and in cathode dew point of 80℃, a cell performance with the low humidifying specification MEA was equal to one with the high humidifying specification MEA under the saturated humidifying condition. Moreover, a non-carbon-base catalyst support was developed in order to inhibit the deterioration of the cathode catalyst. As the result of adding the conductive assistant to an impalpable powder of a new tin oxide, it was obtained the nearly cell performance with a conventional electrode. 2. Humidity environment development of MEA. To improve the decrease in relative humidity by the stack operating temperature to 85℃, a improved separator that had a higher temperature gradient than the previous one was developed. The temperature gradient 15℃ was able to be achieved since the stack with the separator that had the new coolant water passage structure was developed and was evaluated. At the same time, it succeeded in the one dimensional temperature distribution in the cell from the gas inlet to the exhaust, too. Moreover, the MEA were divided into two in the cell in order to adapt to a wider humidifying environment according to making to the high temperature, and the stack used those MEAs with different specification in each region was developed. As a result, the prospect of the stable performance at even the operating temperature 85℃ was obtained.
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