only one gas permeation with the one-μm-thick g-C3N4 membrane at room temperature and one?�bar. The inset shows the gas selectivity for H2 over other gases. b Permeance and separation things from the 1-μm-thick g-C3N4 membranes while in the equimolar blended-fuel permeation at room temperature and one?�bar. Inset exhibits the kinetic diameter