Superdispersed NiCo2S4 nanoparticles anchored on layered C3N4 for high performance supercapacitor

In recent years, the concept of sustainable development has encouraged the development and application of green, natural, and recyclable energy storage devices. Herein, using Ni(NO 3 ) 2 0.6 H 2 O and Co(NO 3 ) 2 0.6 H 2 O as raw material and K 2 S 2 O 8 as a vulcanizing agent, NiCo 2 S 4 nanomaterials@C 3 N 4 (NCS@C 3 N 4 ) composite was prepared by a one-step solvothermal method, in which the introduction of C 3 N 4 significantly improves the dispersion of NCS , while the petal-like NCS also expands the layer spacing of C 3 N 4 , which effectively alleviates the structural instability and promotes the exposure of stable active sites during charge and discharge. Physical structure and electrochemical characterizations showed that the NCS were distributed on the surface of the C 3 N 4 nanosheets , which reduced the stacking of the nanosheets and accelerated the charge transfer during the charging and discharging process. The specific capacity ( C sp ) of the NCS@C 3 N 4 composite electrode was up to 890.4 C/g at a current density of 1 A/g. In addition, the supercapacitor consisting of NCS@C 3 N 4 composite electrode had good cycling stability and still displayed excellent capacitance retention after 3000 cycles. The NCS@C 3 N 4 composite greatly optimizes the stability and extends the operating life of supercapacitors, which has a broad application potential in the field of energy storage devices.