Facile fabrication of novel heterostructured tin disulfide (SnS2)/tin sulfide (SnS)/N-CNO composite with improved energy storage capacity for high-performance supercapacitors

Abstract

• Novel SnS 2 /SnS/ N -CNO composite was syntheiszed by solvothermal and pyrolysis methods. • Heterostructured SnS 2 /SnS/ N -CNO improves conductivity and electrochemical performance. • SnS 2 /SnS/ N -CNO electrode delivered superior specific capacitance of 741.67 F g −1 . • SnS 2 /SnS/ N -CNO showed excellent cycling stability (95%) retention after 2000 cycles. • Heterostructured composite electrode exhibited excellent power and energy densities. The unique properties of the Sn-S system made it a high sensitiveness nanomaterial for prepare higher-performance supercapacitors. The heterostructured SnS 2 /SnS and N -CNOs were synthesized by simple solvothermal and pyrolysis methods, respectively. To improve the conductivity of the SnS 2 /SnS composite, N -CNOs were added to the pristine SnS 2 /SnS. Herein, an ultrasensitive supercapacitor based on SnS 2 /SnS and N -CNOs was fabricated. Compared to the pristine SnS 2 /SnS heterostructured composite, SnS 2 /SnS/ N -CNO showed high supercapacitance performance due to the increase in conductivity with the addition of C-based N -CNOs. Regarding that SnS 2 /SnS/ N -CNO has superior electrochemical performances comparable to SnS 2 /SnS, because of the fast electronic transportations and volume changes in the formations of SnS 2 /SnS/ N -CNO heterostructures. The electrochemical performance of the SnS 2 /SnS/ N -CNO electrode enhanced specific capacitance value of 741.67 F g −1 from SnS 2 /SnS electrode specific capacitance of 350 F g −1 at a 0.5 A g −1 and it showed excellent cycling stabilities of 95% retention even after 2000 cycles. The obtained results suggest that the SnS 2 /SnS/ N -CNO is efficient to be applicable as a novel electro-active source in supercapacitor devices to render higher performances and stable energy storage applications.