MoS2/cellulose paper coupled with SnS2 quantum dots as 2D/0D electrode for high-performance flexible supercapacitor

Abstract

The effective incorporation of novel and highly conductive hybrid functional nanomaterials onto flexible and porous substrates is extremely desirable to develop flexible supercapacitors. Herein, a novel 2D/0D-MoS₂/SnS₂ on a flexible cellulose paper substrate has been demonstrated for its utilization in flexible supercapacitors. The surface morphology and particle size of the MoS₂ and SnS₂ QDs, elemental composition, absorption spectra, and crystallinity have been analyzed thoroughly. Further, to explore the supercapacitor applications, the electrochemical response has been studied. The obtained results demonstrate that both the pristine MoS₂ and MoS₂/SnS₂ QDs composites on cellulose paper exhibited excellent electrochemical performance. The specific capacitance for the pristine MoS₂ and MoS₂/SnS₂ QDs displayed 422.2 F g⁻¹ and 277.1 F g⁻¹ at 0.5 A g⁻¹ current density using a conventional two-electrode system. The drop-casting of SnS₂ QDs provides better electrochemical active sites, which contributed to the enhanced specific capacitance of the composite structure. Moreover, it is shown that cellulose paper as an electrode material, using MoS₂ and MoS₂/SnS₂ QDs, is applied as a supercapacitor for potential utilization in wearable electronics applications.