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Electrochemical characterization of porous electrodes and application in SOFC

机译：多孔电极的电化学表征及其在sOFC中的应用

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For the characterization of porous electrodes in solid oxide fuel cells (SOFC), it is shown that impedance spectroscopy can play an important role, in particular with respect to the optimization of the three-phase-boundaries (TPB, i.e. electrolyte-electrode-gas phase area). The TPBs are the sites where the electrode reactions occur and their nature is determined by the microstructure of the electrode. A three-electrode measurement configuration is used, in order to quantify the TPB area. By measuring a series of electrodes, in which one microstructure parameter is varied, a systematic change in impedance diagrams is observed. The technique can be used to show the effect of ceramic processing parameters on the TPB. Therefore it offers a simple and fast way to screen electrodes for SOFC development. It should be noted that the impedance data represent a semi-quantitative data set, which has to be used in a comparative way. The use of impedance spectroscopy and the correlation between impedance data and fuel cell performance is illustrated for a set of electrolyte supported SOFC cathode microstructures. 14 figs., 4 tabs., 16 refs.

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