Due to their long cycle life,high power density as well as fast charge-discharge process in seconds,supercapacitors have generated ever-increasing interest for a promising candidate for novel alternative energy-storage vehicles1.In this work,we describe a simple and scalable method to fabricate free-standing hierarchical graphene/carbon nanofiber/polypyrrole film via an in situ polymerization process.The morphology analysis shows that the introduced onedemensional(1D)carbon nanofibers act as a conductive nanospacer not only inhibiting the stacking of laminated graphene layers but also constructing an open-porous graphene/carbon nanofiber architecture.