▎ 摘　　要

In this study, a three-dimensional nitrogen-doped graphene (3DNG)-Fe3+/poly(acrylic acid-co-N,N-dimethylacrylamide) (3DNG-Fe3+/P(AA-co-DMA)) hydrogel with strong flexibility and excellent self-healing property was prepared. The 3DNG-Fe3+/P(AA-co-DMA) hydrogel was characterized by Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM). The specific surface area and pore size distribution of the 3DNG-Fe3+/P(AA-co-DMA) hydrogel were measured by using Brunauer-Emmett-Teller (BET) method. The experimental results demonstrate that when 6 mol% FeCl3 was added, the breaking strain of Fe3+/P(AA-co-DMA) hydrogel reaches 1149 %, and the tensile strength reaches 689 kPa. Furthermore, the recovery degree of Fe3+/P(AA-co-DMA) hydrogel was almost 100 % after 24 h. The supercapacitors based on 3DNG-Fe3+/P(AA-co-DMA) hydrogel have a specific capacitance value of 231.8 F g(-1) at 1 A.g(-1), and conductivity is 0.053 S.cm(-1). When the power density is 5 kW kg(-1), the energy density of the device is 38.7 Wh kg(-1).