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    • 5. 发明申请
    • Membrane Electrode Assembly for Use in Electochmical Devices
    • 用于电子设备的膜电极组件
    • US20070215461A1
    • 2007-09-20
    • US10564794
    • 2004-07-14
    • Ralf ZuberSandra WittpahlKlaus SchaackHolger DziallasPeter SeipelGunther VulpiusBernd Dillmann
    • Ralf ZuberSandra WittpahlKlaus SchaackHolger DziallasPeter SeipelGunther VulpiusBernd Dillmann
    • C25C7/02
    • H01M8/1004C25B9/10H01M4/8626H01M4/8896H01M8/0247Y02E60/366Y02E60/523
    • The invention relates to a membrane-electrode assembly (MEA) for electrochemical devices, in particular for membrane fuel cells. The membrane-electrode assembly has a semi-coextensive design and comprises an ion-conducting membrane, two catalyst layers and gas diffusion layers of differing sizes on the front side and rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, while the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane. As a result, the ion-conducting membrane has a surface which is not supported by a gas diffusion layer on the front side. The membrane-electrode assembly has, owing to the particular construction, a stable structure which can be handled readily and displays advantages in the sealing of the reactive gases from one another and also in terms of the electrical properties. In particular, the hydrogen penetration current is significantly reduced. New processes for producing the MEA of the invention are described, in particular the method of heat pulse welding. The membrane-electrode assembly is used in PEM fuel cells, direct methanol fuel cells, electrolysers and other electrochemical devices.
    • 本发明涉及用于电化学装置的膜 - 电极组件(MEA),特别是用于膜式燃料电池。 膜 - 电极组件具有半共扩展设计,并且包括在前侧和后侧上具有不同尺寸的离子传导膜,两个催化剂层和气体扩散层。 第一气体扩散层具有比离子传导膜更小的平面尺寸,而第二气体扩散层具有与离子传导膜基本相同的平面尺寸。 结果,离子传导膜具有不在前侧的气体扩散层支撑的表面。 由于特殊的结构,膜 - 电极组件具有可以容易地处理的稳定的结构,并且在反应气体彼此密封以及电性能方面显示出优点。 特别地,氢穿透电流显着降低。 对本发明的MEA的制造新工艺进行了详细描述,特别是热脉冲焊接方法。 膜电极组件用于PEM燃料电池,直接甲醇燃料电池,电解槽和其他电化学装置。