1 research outputs found
Flower-like Heterogeneous Phosphorus-Doped Co<sub>3</sub>S<sub>4</sub>@Ni<sub>3</sub>S<sub>4</sub> Nanoparticles as a Binder-free Electrode for Asymmetric All-Solid-State Supercapacitors
Through the hydrothermal method and the gas-phase phosphating
method,
the flower-like heterogeneous phosphorus-doped Co3S4@Ni3S4 was synthesized in situ on a
nickel foam substrate as the binder-free electrode material for supercapacitors.
Phosphorus-doped Co3S4@Ni3S4 electrode material combines the merits of transition metal sulfides
and 3D porous network heterostructure, showing the excellent theoretical
specific capacitance and the high specific surface area. The introduction
of phosphorus atoms with an atomic radius larger than sulfur atoms
can optimize the internal electronic structure and cause structural
distortion. Therefore, the specific capacitance/specific capacity
of this electrode can reach 3614 F g–1 (451 mAh
g–1) at 1 A g–1 and still maintain
the initial specific capacitance of 73% after 3000 cycles. The assembled
P–Co3S4@Ni3S4-175//AC
ASC device exhibits an ultra-high energy density of 72 Wh kg–1 at a power density of 800 W kg–1. Meanwhile, it
can show extraordinary cyclic stability, with a retention rate of
91% after 5000 cycles. This work provides a feasible synthesis method
to prepare the composite electrode materials for supercapacitors