Enhanced Electrochemical Properties of N-Doped Carbon Nanofibers by Co9S8 Nanoparticles Derived from ZIF-67

ZIF-67 has been widely utilized for the preparation of Co-based catalysts, N-doped porous carbon, and a variety of energy storage nanomaterials. In this paper, ultrafine Co 9 S 8 nanoparticles derived from ZIF-67 have been employed to improve the electrochemical performance of N-doped carbon nanofibers (CNFs). The Co 9 S 8 nanoparticles embedded into the CNFs provide the composites with extra Li-storage capacity and high rate capability. An accessible discharge capacity around 762 mAh g −1 can be obtained at a current density of 0.1 A g −1 after 100 cycles. Besides, the composites exhibit better cycling performance and rate capability compared with the raw N-doped CNFs.