Copper-tin Sulfide Nanoparticle Array: Simple Fabrication Strategy, Identification, and Investigation of its Application in Electrochemical Supercapacitors

In terms of power density, supercapacitors exhibit excellent performance like conventional capacitors and high energy density like batteries. In addition, supercapacitors offer unprecedented applications and development prospects in the field of energy storage due to their fast charging, simple manufacturing technology, safety, and environmental compatibility. The use of supercapacitors is sometimes limited by the poor electrochemical performance and low cyclic stability of the electrode materials. To achieve very high performance and stability, which are crucial criteria for supercapacitor applications, the fabrication of nanostructured materials to improve the specific surface area and electrical conductivity is crucial. In the present work, a simple and economical hydrothermal route was used for the synthesis of Cu2SnS4 nanoparticles. The structure, chemical composition, and morphology of the synthesized materials were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), as well as X-ray energy diffraction (EDX), and elemental mapping to confirm the elemental composition of the prepared electrode. The electrode fabricated in this research was able to exhibit a high capacitance of 2076.9 F g-1 at a current density of 1 A g-1 and a stability of 90.44% after 10000 cycles. In addition, the asymmetric supercapacitor Cu2SnS4//AC provides a capacitance of 246.93 F g-1 at a current density of 1 A g-1 and a stability of 82.32% after 10000 cycles. The excellent electrochemical performances of Cu2SnS4 nanostructure will have significant technological applications in the future.