Polyacrylonitrile Nanofibers (PPNFs), in addition to conductive polymers, have also been found to be effective supports for MOFs electrode materials. In 2020, Tian et al. employed the hydrothermal method to produce bimetallic M-Ni MOFs (M=Co, Cu, Zn, Fe) flower-shaped nanosheets supported by PPNFs as hybrid electrodes . The rate performance and capability of the PPNF@M-Ni MOF (where M stands for Co, Zn, Fe and Cu) are in the following order: