a Single gasoline permeation on the 1-?m-thick g-C3N4 membrane at area temperature and 1??bar. The inset demonstrates the fuel selectivity for H2 over other gases. b Permeance and separation components with the 1-?m-thick g-C3N4 membranes from the equimolar mixed-gas permeation at place temperature and one??bar. Inset reveals the kinetic diameters