just one fuel permeation on the 1-?m-thick g-C3N4 membrane at home temperature and one??bar. The inset displays the fuel selectivity for H2 over other gases. b Permeance and separation variables from the one-?m-thick g-C3N4 membranes while in the equimolar blended-gas permeation at area temperature and one??bar. Inset displays the kinetic diameters