Synergistic effects in TiO2/MoS2/SnS ternary nanocomposite electrodes for enhanced supercapacitor performance

Abstract

Transition metal chalcogenides have emerged as promising electrode materials for pseudocapacitors due to their superior redox activity, short ion diffusion pathways, electrical conductivity, better cyclability, and rich electrochemical active sites. Herein, a ternary hybrid TiO₂/MoS₂/SnS electrode material was successfully synthesized via a hydrothermal approach and employed as an electrode for high-performance supercapacitor applications. The ternary electrode material exhibited a remarkable specific capacitance of 1519 F g⁻¹ at 1 A g⁻¹, with 92.77 % capacitance retention over 10,000 cycles, demonstrating excellent cycling stability. Additionally, it achieved an energy density of 13.18 Wh kg⁻¹ at a power density of 125 W kg⁻¹. Post-cycled XRD and SEM analysis confirmed the electrode's structural stability after 10,000 cycles, with minor peak shifts and a retained porous morphology ensuring sustained electrochemical performance. To further assess its practical feasibility, an asymmetric supercapacitor (ASC) device was assembled using activated carbon as the negative electrode, achieving a capacitance of 395 F g⁻¹ at 0.5 A g⁻¹, with an energy density of 79 Wh kg⁻¹ and a power density of 300 W kg⁻¹. The exceptional electrochemical performance and pseudocapacitive behavior of the ternary composite arise from the synergistic interaction of its components, facilitating enhanced charge storage and stability.