TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The first gas and the second gas include a component selected from O2, N2, H2O and/or H2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Humidifier: In the humidifier, the first flow field plate and the second flow field plate each independently include a peripheral sealing section. Preferred Components: The polymeric membrane has a permeance of greater than 6000 GPU. The polymer segment (I) is repeated from 1-10000 times. The polymeric membrane further comprises a non-ionic polymer that is blended with the first polymer to form a polymeric blend, where the non-ionic polymer is a fluoroelastomer, and the first polymer is present in an amount of 1-80 wt.%. The polymer segment (I) further comprises a polymer block of formula: -(E2-P3-Q2-P4)k- (II).k=3-100;E2=aromatic containing moiety (preferably 16 groups of formulae as given in the specification, e.g. group of formulae (i)-(v));P3 and P4=absent, -O-, -S-, -SO-, -SO2-, -CO-, -NH-, NR2- or -R3-;Q2=fluorinated cyclobutyl moiety. Preferred Definitions:    -A1CF2CF2-Z1=-(CF2-CF2)p-O-(CF2-CF(CF3))a-(O-CF2)b-(CF2)c-SO3H or -CF2-CF2-O-CF2CF2-Z1;    a, b, c and p=1-10;    Z1=SO2OH.    EXAMPLE - A 5 wt.% solution, in N,N-dimethylacetamide was prepared using a perfluorocyclobutyl-graft-perfluorosulfonic acid (PFCB-g-PFSA) ionomer prepared from the reaction of the potassium salt of 2-(2-iodotetrafluoroethoxy)tetrafluoroethanesulfonyl fluoride, with the aryl brominated perfluorocyclobutyl polymer (having weight average molecular weight of 90000) polymerized from a biphenyl perfluorocyclobutane oligomer (having weight average molecular weight of 16000) and a hexafluoroisopropylidene-bis-trifluorovinyl ether monomer. A blend solution was prepared by adding 5 wt.% solution of Kynar Flex 2751 (RTM: copolymer of vinylidene fluoride and hexafluoropropylene) (3 g) in N,N-dimethylacetamide to the 5 wt.% perfluorocyclobutyl solution (7 g). The ePTFE support was placed in contact with a clean sheet of extruded Teflon (RTM: fluoropolymeric plastic resin) at 50 degrees C, wetted homogeneously with isopropanol and dried. The 5 wt.% perfluorocyclobutyl ionomer blend solution was coated on the porous polytetrafluoroethylene support. The polytetrafluoroethylene structure remained opaque and the wet-film was dried over a 15 minute period. The resultant single layer composite membrane film was lifted from the clean sheet of extruded Teflon and used as a water vapor transfer membrane in a humidified, hydrogen-air fuel cell system that was operated at less than 100 degrees C.