Nanostructured MoS2/BiVO4 Composites for Energy Storage Applications

Abstract

We report the optimized synthesis and electrochemical characterization of a composite of few-layered nanostructured MoS₂ along with an electroactive metal oxide BiVO₄. In comparison to pristine BiVO₄, and a composite of graphene/BiVO₄, the MoS₂/BiVO₄ nanocomposite provides impressive values of charge storage with longer discharge times and improved cycling stability. Specific capacitance values of 610 Fg^-1 (170 mAhg^-1) at 1 Ag^-1 and 166 Fg^-1 (46 mAhg^-1) at 10 Ag^-1 were obtained for just 2.5 wt% MoS₂ loaded BiVO₄. The results suggest that the explicitly synthesized small lateral-dimensioned MoS₂ particles provide a notable capacitive component that helps augment the specific capacitance. We discuss the optimized synthesis of monoclinic BiVO₄, and few-layered nanostructured MoS₂. We report the discharge capacities and cycling performance of the MoS₂/BiVO₄ nanocomposite using an aqueous electrolyte. The data obtained shows the MoS₂/BiVO₄ nanocomposite to be a promising candidate for supercapacitor energy storage applications.