Fig. 1

Structure design and morphology of CNFIG. a Schematic illustration of the synthesis of ultra-stable CNFIG architecture based on CNFs and graphene sheets; SEM images of b CNFs (scale bar = 5 μm) and c GO sheets (scale bar = 5 μm); SEM images of CNFIG architectures at d low (scale bar = 30 μm), e medium (scale bar = 20 μm), and f high (scale bar = 10 μm) magnifications; g schematic representation of the compressible ability of CNFIG; h digital photos of the CNFIG architecture being compressed; i Stress-strain curves of CNFIG at the 1st, 20th, and 30th cycles