Fluorinated membranes

Details Fluorinated membranes Fluorinated membranes

2008-07-15

2008-07-15

Mulcahy, Peter D. (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

C429S006000, C526S243000, C526S247000

Reexamination Certificate

active

07399791

ABSTRACT:
Ionomeric membranes comprising (per)fluorinated, se-micrystalline or amorphous, ionomeric polymers, having equivalent weight (EW) from 380 g/eq to 1,800 g/eq, which used in fuel cells, under the following conditions:membrane thickness 50 μm assembled between two electrodes catalyzed with 0.6 mg/cm2Pt/C and treated with 0.7 mg/cm2of Nafion®, having a 10 cm2area; hydrogen and air feeding, both at the pressure of 0.25 MPa, both saturated with water at 80° C.; cell temperature 75° C.;for membranes formed of copolymers TFE/F2C═CF—O—(CF2)2—SO2F, give the following maximum specific power (PMAX) values, at the indicated EW values:at EW=670 PMAXhigher than 0.55 Watt/cm2;at EW=830 PMAXhigher than 0.66 Watt/cm2;at EW=1,160 PMAXhigher than 0.50 Watt/cm2;at EW=1,600 PMAXhigher than 0.32 Watt/cm2.

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