Nickel cobalt sulfide nanosheets uniformly anchored on porous graphitic carbon nitride for supercapacitors with high cycling performance

- A facile hydrothermal route was developed to growth of NiCo2S4 nanosheets uniformly anchored on porous g-C3N4 nanosheets.
- NiCo2S4 NSs/P-g-C3N4 shows high specific capacity, outstanding rate capability, and excellent cycling stability.
- NiCo2S4 NSs/P-g-C3N4//AC asymmetric supercapacitor delivers high energy density with high cycling performance.

Nickel cobalt sulfide (NiCo2S4) nanosheets were successfully grown on porous graphitic carbon nitride (g-C3N4) nanosheets (NiCo2S4 NSs/P-g-C3N4), which was employed as supercapacitor electrode materials. The NiCo2S4 NSs/P-g-C3N4 electrode shows specific capacity as high as 506 C g−1 at a current density of 1 A g−1, outstanding rate capability and cycling stability (almost no attenuation after 1500 cycles at 3 A g−1), which can be attributed to the unique 'sheets on sheets' architectures providing short ion diffusion pathways, and good ion permeability. NiCo2S4 NSs/P-g-C3N4 was combined with activated carbon (AC) to construct NiCo2S4 NSs/P-g-C3N4//AC asymmetric supercapacitor (ASC), which offers a specific energy of 16.7 W h kg−1 at a specific power of 200 W kg−1, and high cycling performance (about 99% retention after 5000 continuous cycles). An ASC device could power a mini-fan for about 60 s, demonstrating that NiCo2S4 NSs/P-g-C3N4 is a potential electrode material for energy storage.

A facile hydrothermal route was developed to growth of NiCo2S4 nanosheets uniformly anchored on porous g-C3N4, which shows excellent performance for supercapacitors.197