F FFC-NMR of Catalyst Layer Materials for Polymer Electrolyte Membrane Fuel Cells
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چکیده
1 H and 19 F spin lattice relaxation rates of catalyst layer materials (CLM) of polymer electrolyte membrane fuel cells were measured by the fast field cycling (FFC) method. In contrast to ionomer membranes, 1 H relaxation rates of adsorbed water in both platinumKetjen black (Pt-KB) catalyst powder and CLM were strongly dependent on Larmor frequency approximated by a power law due to the strong surface interaction of adsorbed water. The difference in the frequency dependence in the Pt-KB and the CLM was attributed to higher acidity of the CLM.
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تاریخ انتشار 2013