Gore-Select

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... 

Hyflon lon-FM EW = 800 Hyflon lon-FM EW = 900 Nafion 117 Nafion 115 Gore-select... 

FIGURE 27.37 Fabrication scheme of Gore-Select described in U.S. Patent 5,547,551. (Reproduced fromNakao, M. and Yoshitake, M., 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.)... 

Fatty esters, flow promotor, mold release agent, 200 Gore-Select ... 

The company W.L. Gore Associates (EUcton, MD) develops membranes under the name Gore-Select consisting of a microporous stretched PTFE (expanded PTFE porous sheet) membrane filled with perfluorinated ionomer. The micro-porous PTFE matrix provides the mechanical strength, and... 

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

Effectively thin ionomer layers can be obtained on porous polymeric supports giving membranes with good mechanical strength and lower resistance to proton transport. This is the strategy used for the preparation of the Gore-select [156]. 

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... 

Grohs JR, Li Y, Dillard DA, Case SW, EUis MW etal. (2010) Evaluating the time and temperature dependent biaxial strength of Gore-Select series 57 proton exchange membrane using a pressure loaded blister test . J. Power Sources 195 527. 

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