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(a) XRD of N-CNTs/N-graphene and N-graphene; (b) Raman spectra of N-CNTs/N-graphene and N-graphene on the surface of NF; (c) N2 adsorption-desorption curves of N-CNTs/N-graphene and NF; (d) Pore distribution of N-CNTs/N-graphene; (e,f) XPS spectrum and high-resolution XPS of N1s of N-CNTs/N-graphene.
