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首页> 外文期刊>Energy & environmental science >Roll-to-roll coated PBI membranes for high temperature PEM fuel cells
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Roll-to-roll coated PBI membranes for high temperature PEM fuel cells

机译：卷对卷涂层PBI膜用于高温PEM燃料电池

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摘要

We employed roll-to-roll coating in the preparation of 40 μm thick poly[2,2'(m-phenylene)-5,5'bibenzimidazole] (PBI) films for fuel cells using both knife-coating (KC) and slot-die (SD) coating. The films were coated directly from a 9% (w/w) solution of PBI in dimethylacetamide onto a sacrificial low cost paper or plastic based carrier substrate and dried using a hot air oven with a length of 1 m at 140 ℃. A web width of 305 mm, a working width of 250 mm and a web speed of 0.2 m min"' were explored to ensure efficient drying of the thick wet film. A large air flow was found to efficiently avoid skinning. Films were prepared by a single coating step and by two subsequent coating steps in order to explore whether two coating steps gave films with fewer defects. A significant development towards upscaling the PEM fuel cell technology was that the PBI membrane was coated onto a sacrificial carrier substrate allowing for easy recoating on top of the firstly prepared film. It was thus possible to prepare free-standing films by a simple coating procedure followed by delamination from the carrier substrate post-film formation and drying. We finally carried out systematic membrane characterization with respect to solubility, phosphoric acid doping and fuel cell performance. Our results showed that the PBI membranes prepared in this work have identical properties compared to traditionally cast membranes while enabling an increase of a factor of 100 in manufacturing speed.
机译：我们使用刮涂（KC）和狭缝方式，采用卷对卷涂层制备燃料电池的40μm厚聚[2,2'（间亚苯基）-5,5'联苯并咪唑]（PBI）薄膜模（SD）涂层。将薄膜直接从9％（w / w）的PBI的二甲基乙酰胺溶液中涂布到牺牲的低成本纸或塑料基载体基材上，并使用长度为1 m的热风烤箱在140℃下干燥。探索了305毫米的幅宽，250毫米的工作幅宽和0.2 m min''的幅速，以确保有效干燥厚的湿膜。发现大的空气流量可以有效地避免结皮。一个单一的涂覆步骤，以及随后的两个涂覆步骤，以探究两个涂覆步骤是否会使膜的缺陷更少。向上扩展PEM燃料电池技术的一项重大进展是，将PBI膜涂覆在牺牲性载体基板上，从而易于重新涂覆因此，有可能通过简单的涂布步骤来制备自立式薄膜，然后从载体基材上剥离下来，然后形成膜并干燥，最后我们对溶解度，磷酸进行了系统的膜表征酸掺杂和燃料电池性能我们的结果表明，与传统的浇铸膜相比，本研究制备的PBI膜具有相同的性能同时使生产速度提高了100倍。

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  • 来源
    《Energy & environmental science》 |2012年第3期|p.6076-6080|共5页
  • 作者

    Thomas Steenberg; Hans Aage Hjuler; Carina Terkelsen; Maria T. R. Sanchez; Lars N. Cleemann; Frederik C. Krebs;

  • 作者单位

    Danish Power Systems, DTU, Bldg. 207, DK-2800 Lyngby, Denmark;

    Danish Power Systems, DTU, Bldg. 207, DK-2800 Lyngby, Denmark;

    Danish Power Systems, DTU, Bldg. 207, DK-2800 Lyngby, Denmark;

    DTU Energy Conversion, Technical University of Denmark, Kgs. Lyngby, Denmark;

    DTU Energy Conversion, Technical University of Denmark, Kgs. Lyngby, Denmark;

    DTU Energy Conversion, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

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