an individual fuel permeation from the one-μm-thick g-C3N4 membrane at home temperature and 1?�bar. The inset shows the fuel selectivity for H2 around other gases. b Permeance and separation elements with the 1-μm-thick g-C3N4 membranes while in the equimolar combined-fuel permeation at home temperature and 1?�bar. Inset exhibits the kinetic