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(a) SEM image of the N-CNTs/N-graphene hybrid grown on the surface of nickel foam; (b,c) The top view of low and high magnification SEM images of the N-CNTs; (d,e) Low-magnification and high-magnification SEM images of one side view of N-CNTs and N-graphene on the surface of the nickel foam; (f) SEM image of the only N-graphene layers grown on the surface of nickel foam.
