We are often asked about the relative selectivity of water in Nafion relative to common gasses. Please see the graph below for the relative gas permeability of water through Nafion versus some common gases. As you can see, Nafion is very effective at transporting only water while keeping the other gasses separated.
Foe example, for H2S and CO2, water has a 1000 to 1 affinity and O2 and N2 a 1,000,000 to 1.
