Application of WS2-G composite as cathode for rechargeable magnesium batteries

The graphene-supported WS2 composite (WS2-G) was synthesized by the ultra-sonication method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FESEM) showed WS2 had been successfully combined with the graphene. The charge-discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy were used to study electrochemical properties of as-synthesized composite material. The results showed that the electrochemical properties of graphene-supported WS2 were superior to that of WS2 material. The initial discharge capacity of the graphene-supported WS2 material reached 82 mAh g−1. After 100 cycles, it still had a capacity retention rate of 95%. Enhanced electrochemical performance of graphene-supported WS2 could be attributed due to the synergistic effect between WS2 and highly conductive graphene. The intercalation behavior of Mg2+ is further confirmed by XRD, EDX, and XPS analysis.