▎ 摘　　要

NOVELTY - Porous carbon nanofiber has a hierarchical through-hole structure formed by several basic units comprising carbon nanotubes and graphene nano-strip connected to the carbon nanotubes, where at least one carbon nanotube is arranged between at least two graphene nano-strip. USE - The porous carbon nanofiber is used for preparing chemical energy storage device such as flexible supercapacitor or battery, or high specific surface area catalytic carrier (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the porous carbon nanofiber, which involves (i) shearing at least a partial area of the surface layer of the outer wall of the multi-walled carbon nanotube to form a basic unit, where the basic unit comprises carbon nanotubes and graphene nano-strip, a local area of the graphene nano-strip is integrated with the carbon nanotubes, and the remaining areas are separated from the carbon nanotubes, (ii) dispersing several basic units in an aqueous phase system or an organic phase system to form a gel, (iii) wet-spinning the gel to obtain a gel fiber, and (iv) performing solvent substitution on the gel fibers to form hydrogel fibers, freezing, and freeze-drying or supercritical drying to obtain the porous carbon nanofibers with a hierarchical through-pore structure; (2) an electrode material for a chemical energy storage device comprising the porous carbon nanofiber; and (3) a high specific surface area catalytic carrier comprising the porous carbon nanofiber.