Partially Fluorinated Aarylene Polyethers and their Ternary Blends with PBI and H₃PO₄. Part II. Characterisation and Fuel Cell Tests of the Ternary Membranes

Abstract

Due to an unfortunate mistake, the publishers regret that Fig. 7 on p.196 of the above article was incorrect. The correct figure is shown below. The editorial team apologizes for any inconvenience this may have caused. 0 0,2 0,4 0,6 0 50 100 150 200 Temperature / ° C Conductivity / Scm-1 100%H3PO4 PPA-membrane, ADL=32, RH=0% Nafion 117, RH=95% DMAc-membrane, ADL=5.7 TFA-membrane, ADL=6, RH=5% PBI-1b, ADL=11, RH=10% Fig.7 Proton conductivity of acid doped PBI and PBI-1b blend membranes as a function of temperature. As a comparison, data for 100% phosphoric acid and Nafion 117 are also included. The PPA-cast membrane was with an acid doping level of 32 and at relative humidity of 0% [20]; The DMAc-cast membrane was with an acid doping level of 5.7 and under atmosphere with a water-to-air ratio of about 0.7 [6]; The TFA membrane was with an acid doping level of 6.0 and at relative humidity of 5% [7].

High temperature proton exchange membranes based on polybenzimidazoles for fuel cells

“…Kerres et al [161,162] have recently synthesized sulphonated partially fluorinated arylene main chain polymers (Scheme 9), showing excellent stability in hot phosphoric acid at temperatures up to 160 • C. Their blend membranes with PBI exhibit excellent thermal stability and extended stability. Phosphoric acid-doping levels as high as 11-12 have been achieved with high proton conductivities (above 0.1 S cm −1 ), less acid swelling, reasonable mechanical strength and therefore better fuel cell performance [163].…”

“…In a US Patent issued in 1977, Davis and Thomas Scheme 9. Partially fluorinated sulphonated polymers used for preparation of acid-base blend membranes with PBI [163,164]. For fuel cell applications, dibromo-p-xylene (DBpX) has been used as the cross-linker for PBI membranes cast from a DMAc solution [171].…”

“…• C. Solid lines indicate that the samples remained as a whole membrane, whereas dashed lines indicate that samples were broken into small pieces. Data for ionically cross-linked PBI were from [163] and the rest from [171].…”

“…By being exposed to a 3% hydrogen peroxide solution containing 4 ppm Fe 2+ at 68 • C, PBI membranes have been evaluated by the weight loss and visual observation [163,170,171]. The PBI membrane was broken into small pieces after 30 min (indicated with the dashed lines in Fig.…”

High temperature (HT) polymer electrolyte membrane fuel cells (PEMFC) – A review

“…This results from the requirement for optimisation for each system. Comparison of single cell data from different studies should therefore be undertaken with caution as explained by Li et al [109] whilst comparing the single cell data for various PBI materials (Fig. 8).…”