Porous worm-like NiMoO_4 coaxially decorated electrospun carbon nanofiber as binder-free electrodes for high performance supercapacitors and lithium-ion batteries

摘要

Highlights•Flexible porous worm-like NiMoO4/ECNF composite was prepared for the first time.•PVP plays an important role in self-assembling into porous worm-like structure.•The composite can be used as binder-free electrodes for supercapacitor and lithium-ion battery.•High specific capacitance/capacity and excellent cycling stability can be achieved.AbstractThe peculiar architectures consisting of electrospun carbon nanofibers coaxially decorated by porous worm-like NiMoO4were successfully fabricated for the first time to address the poor cycling stability and inferior rate capability of the state-of-the-art NiMoO4-based electrodes caused by the insufficient structural stability, dense structure and low conductivity. The porous worm-like structure endows the electrode high capacitance/capacity due to large effective specific surface area and short electron/ion diffusion channels. Moreover, the robust integrated electrode with sufficient internal spaces can self-accommodate volume variation during charge/discharge processes, which is beneficial to the structural stability and integrity. By the virtue of rational design of the architecture, the hybrid electrode delivered high specific capacitance (1088.5Fg−1at 1Ag−1), good rate capability (860.3Fg−1at 20Ag−1) and long lifespan with a capacitance retention of 73.9% after 5000 cycles when used as supercapacitor electrode. For lithium-ion battery application, the electrode exhibited a high reversible capacity of 1132.1mAhg−1at 0.5Ag−1. Notably, 689.7mAhg−1can be achieved even after 150 continuous cycles at a current density of 1Ag−1. In the view of their outstanding electrochemical performance and the cost-effective fabrication process, the integrated nanostructure shows great promising applications in energy storage.