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Beilstein J. Nanotechnol. 2013, 4, 481–492, doi:10.3762/bjnano.4.57
Figure 1: Chemical structure of poly[oxy-3,3-bis(4′-benzimidazol-2″-ylphenyl)phtalide-5″(6″)-diyl] (PBI-O-PhT...
Figure 2: Equivalent circuit with a transmission line for modelling the impedance response of the active laye...
Figure 3: Small angle X-ray scattering results for the different types of composites and the reference membra...
Figure 4: FT-IR spectra of a mixture of BI with Zr(acac)4 (4:1 molar ratio, upper spectrum) and of the produc...
Figure 5: Possible mechanism of the crosslinking process of PBI by Zr(acac)4 and further doping with PA.
Figure 6: Change of the relative membrane thickness in a series of five consecutive heating/cooling cycles. T...
Figure 7: Thermal expansion coefficients of the composite membranes.
Figure 8: Performance of fuel cells based on PBI membranes of different types. Air is used as an oxidant, T =...
Figure 9: Oxidation current of hydrogen diffusing through the membrane for PBI-O-PhT with 0.75 wt % Zr(OAc)4....
Figure 10: Membrane resistances as functions of the current density for fuel cells with different PBI membrane...
Figure 11: Distributed cathode active layer resistances as functions of current density for fuel cells with di...
Figure 12: The double layer capacitance as a function of the current density for fuel cells with different PBI...
Figure 13: Polarization resistance (the sum of charge-transfer and mass-transfer resistances) as a function of...
Figure 14: 2000-hour stability test of a composite PBI-O-PhT + 0.75 wt % Zr(acac)4 membrane and the reference ...