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Fuel cell components

• Corrosion study on bipolar plates
• Structure of the GDL
• Distribution of phosphoric acid in membrane electrode assemblies of HT-PEFC
• Structure and properties of membrane and electrodes of HT-PEFC

Fluid flow through porous materials plays an important role for the operation of fuel cells. Therefore, one key element is the understanding of the exact structure of the porous regions since this structure is coupled to the overall mass transport in fuel cells. The characterization of porous materials is carried out in cooperation with other institutions [1]. The mass transport through porous layers is also strongly coupled to the properties of the catalyst layers and the membrane [2,3]. Additionally, the behaviour and interaction of the electrolyte (e. g. phosphoric acid or water) with the membrane as function of the operation conditions is of special interest [4,5].
Degradation phenomena at high electric potentials can be observed for different cell components like bipolar plates. The electro-chemical characterization of these processes and mitigation strategies are a further aspect [6]. Figure 1 shows an electrochemical cell with a three electrode arrangement, which is used for material characterization. It allows for the combination of several materials with different electrolytes. Key parameters for these experiments are temperature, potential and electrolyte concentration.

Electrochemical cell with 3 electrode arrangementFigure 1: Electrochemical cell with 3 electrode arrangement

[1] C. Tötzke, I. Manke, G. Gaiselmann, J. Bohner , B. Müller, A. Kupsch, M. P. Hentschel, V. Schmidt, J. Banhart, W. Lehnert; A Dedicated Compression Device for High Resolution X-ray Tomography of Compressed Gas Diffusion Layers, Review of scientific instruments, 86 (2015) 043702

[2] W. Maier, T. Arlt, K. Wippermann, C. Wannek, I. Manke, W. Lehnert, D. Stolten; Correlation of Synchrotron X-ray Radiography and Electrochemical Impedance Spectroscopy for the Investigation of HT-PEFCs, J. Electrochem. Soc 159 (2012) F398-F404

[3] D. Froning, W. Maier, J. Groß, T. Arlt, W. Lehnert, D. Stolten; Evaluation of structural change of HT-PEFCs from in-situ in-situ synchrotron X-ray radiographs, J. Hydrogen Energie 39 (2014) 9447-9456

[4] O. Holderer, O. Ivanova, B. Hopfenmüller, M. Zamponi, W. Maier, A. Majerus, W. Lehnert, M. Monkenbusch, R. Zorn; Observing proton motion on the nanoscale in polymeric electrolyte membranes with quasielastic neutron scattering, Int. J. Hydrogen Energie 39 (2014) 21657-21662

[5] M. Khaneft, O. Holderer, O. Ivanova, W. Lüke, E. Kenzinger, M.S. Appavou, R. Zorn, W. Lehnert, Structure and proton dynamics in catalytic layer for HT-PEFC, Fuel cells, March 2016 accepted,10.1002/fuce.201500167

[6] V. Weissbecker, K. Wippermann, W. Lehnert; Electrochemical Corrosion Study of Metallic Materials in Phosphoric Acid as Bipolar Plates for HT-PEFCs, J. Electrochemical Soc. 161 (2014) F1437-F1447