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Characterization of the multilayer ZIF-L heterostructure derivatives. (a) Schematic illustration of the formation and TEM images of (b) 1-CoNC, (c) 3-CoZnNC, (d) 5-CoZnNC, and (e) 7-CoZnNC via thermal treatment. (f) HRTEM image and (g) Co 2p XPS spectra for 1-CoNC. (h) Nitrogen adsorption–desorption isotherms and (i) pore size distribution of the multilayer ZIF-L heterostructure derivatives.
