Synergistic Effects of Cobalt Molybdate@Phosphate Core-Shell Architectures with Ultra-High Capacity for Rechargeable Hybrid Supercapacitors

Designing binder-free and core-shell-like electrode materials with synergistic effects have attracted widespread attention for the development of high-energy density hybrid supercapacitors (HSCs). Herein, binder-free cobalt molybdate nanosheets laminated cobalt phosphate micropetals on nickel foam (CoM NSs@CoP/NF) were facilely prepared for use as an effective battery-type electrode in hybrid SCs. With the multifunctional features, the rationally combined core-shell-like CoM NSs@CoP/NF electrode exhibited a maximum capacity of 886.8 Ah/cm2 at a current density of 5 mA/cm2 with a good rate capability of 64.2% and cycling stability of 87.4% (after 10000 cycles). The high electrochemical performance of hybrid composite could be attributed to the synergistic effects of hierarchical architectures and large accessible electroactive area, which facilitate the fast electron/transportation within the active material and accelerate the redox chemistry process. Utilizing the superior energy storage properties, a po...