Gore-Select membrane

The conductivity data measured in situ in Fig. 1 are within the temperature range from room temperature (27°C) to -30°C. In contrast, Cleghorn et al. reported the proton conductivity for Gore-Select membranes in the temperature range of 40-100°C.23 Extrapolating the correlation of Cleghorn et al. to 27°C and at 100% relative humidity, the membrane conductivity is calculated to be 0.027 S/cm, which is in reasonable agreement with our in-situ measurement of 0.021 S/cm. 

PFSA lonomer in Expanded Porous PTFE, Gore-Select Membranes.786... 

FIGURE 27.38 Comparison of tear strength for hydrated and dry Gore-Select membranes (25 p,m) and Nafion 112 membranes in MD and TD. (Reproduced from Cleghom, S., Kolde, J., and Liu, W., in W. Vielstich, H.A. Gasteiger, and A. Lamm (Eds.), Handbook of Fuel Cells Fundamentals, Technology and Applications, Vol. 3, J. Wiley Sons, Chichester, 2003. With permission.)... 

Gore-Select membrane is more tear resistant than the dry transverse direction for Nafion 112 membranes (cf. Figure 21.30). 

Gore-Select membrane is a recent innovation that is useful for fuel cells. The membrane is made by filling the pores of Gore-Tex (expanded PTFE) with a per-fluorinated ionomer Hke Nafion. The resulting membrane is about 20 pm thick, about one tenth the thickness of a Nafion membrane, and it has about half the resistance of Nafion. Membrane-electrode assembhes are made by applying platinum black coatings (0.3 mg/cm ) to both surfaces. They are reported to perform well in fuel cells [46]. 

Various approaches to macrocomposite dimensionally stabilised PFSA membranes have been developed and integrated into benchmark MEAs. For example, Gore-Select membranes (W. L. Gore and Associates) comprise a Teflon-like component providing mechanical strength and dimensional... 

Fig. 7 CeU G2 cathode catalyst-layer and GDL mass-transport overpotentials, oxygen reduction reaction (ORR) overpotential, and iR-corrected cell voltage as a function of current density at different durability testing times (1,054 total hours at constant 0.90 A cm Gore PRIMEA series 5620 MEA (50.0-cm active area, 0.40/0.60mg Pt cm, 35- am Gore SELECT membrane) SGL SIGRACET GDL 24BC (5wt%/23wt% PTFE substrate/MPL) at both sides. See the Appendix for durability testing conditions. RH Relative humidity, A Anode, C Cathode...

Fig. 4 Comparison of Nafion-112 and GORE-select membrane 25 mm based MEAs Polarization performance and difference in polarization performance in cells operated with either dry or 100% RH cathode humidification (1(X)% RH anode in both experiments). General Motors (GM) Global Alternative Propulsion Center (GAPC) 500 cm fuel cell stack at cell temperature 80°C, hydrogen and air reactants at 2.0x stoichiometric flow and 270 kPa operating pressure (from Cleghorn et al., 2003).

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