▎ 摘　　要

NOVELTY - The method for preparing porous graphene-carbon nanotube composite fiber involves providing graphene-carbon nanotube composite fiber, applying voltage on the graphene-carbon nanotube composite fiber, and causing the graphene-carbon nanotube composite fiber to expand in the radial and/or longitudinal directions to form graphene-carbon nanotube composite fiber with three-dimensional pore structure. USE - The method is useful for preparing porous graphene-carbon nanotube composite fiber. ADVANTAGE - The method enables simple, rapid and economical preparation of porous graphene-carbon nanotube composite fiber with high efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for porous graphene-carbon nanotube composite fiber prepared by the method.