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Characterization and innovative production technique for pefc and dmfc electrodes

机译：Pefc和Dmfc电极的表征和创新生产技术

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Three different rolling techniques for the production of electrode membrane assemblies (MEAs) have been studied. These techniques allow to produce electrodes of any desird thickness. These MEAs as well as E-TEK MEAs for comparision were characterized with different techniques. The most common elelctrochemical methods used to characterize the electrochemical performance of a fuel cell is recording of current/voltage U(i) curves. For a detailed understanding of electrochemical and ohmic contributons o the U(i) characteristics we study MEAs with electrochemical impedance spectroscopy (EIS). From this measurements it is possible to split the cell impedance into electrode impedances and electrolyte resistance. Further informations on MEA parameters can be obtained by phsical characterization methos. Scanning electron microsocpe (SEM) images of cross sections given informations on the layer tyickness and uniformity which could be reduced due to a new production technique. With the surface sensitive method of X-ray photoelectron spectroscopy (XPS) changes during the conditioning process of an electrode were invstigated.
机译：已经研究了三种不同的用于生产电极膜组件（MEA）的轧制技术。这些技术允许制造任何期望厚度的电极。这些MEA以及用于比较的E-TEK MEA用不同的技术进行了表征。用于表征燃料电池电化学性能的最常见的电化学方法是记录电流/电压U（i）曲线。为了详细了解U（i）特性的电化学和欧姆贡献，我们使用电化学阻抗谱（EIS）研究了MEA。通过该测量，可以将电池阻抗分为电极阻抗和电解质电阻。 MEA参数的更多信息可通过物理表征方法获得。横截面的扫描电子显微镜（SEM）图像给出了有关层厚度和均匀性的信息，由于新的生产技术，这些信息可能会降低。使用X射线光电子能谱（XPS）的表面敏感方法，研究了电极调节过程中的变化。

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