Study on electrochemical performance of temperature-dependent Cu–Sb–S system

In this work, the Cu–Sb–S system has been synthesized using a temperature-dependent solvothermal method. The crystalline phase has been confirmed as tetragonal Cu 3 SbS 4 with an average crystallite size of 68 nm. FESEM image shows the growth temperature leading to the change in morphology as flakes, granules, and microflower of composed nanosheets. Following XRD, TEM also supported the lattice spacing as 0.31 nm along with the (1 1 2) plane. The presence of Cu, Sb, S, and their oxidation state is ensured by XPS analysis. The optical analysis exhibits the absorption in the near-IR region and the bandgap is estimated to be 0.80 eV. The electrochemical properties of the Cu 3 SbS 4 electrodes were studied using CV (Cyclic Voltammetry), GCD (Galvanostatic Charge–Discharge), and EIS (Electrochemical Impedance Spectroscopy) analyses. The high specific capacitance of the CAS 3 sample is obtained as 1422.6 F/g. Hence from the obtained results, we conclude Cu 3 SbS 4 can be used as a potential candidate in electrochemical application.