Expeditious synthesis of 3D Pyramidal faceted CuSbS2 architectures manifesting unrivalled pseudo capacitive energy storage

Abstract Developing supercapacitive materials via cost‐effective and scalable methods to synergistically achieve high specific capacitance and specific energy/density remains a grandiose challenge. Here a low‐cost and scaled‐up controlled microwave synthesis method is developed for engineering 3D pyramidal faceted Chalcostibite (CuSbS2) architectures towards supercapacitive application. The phase purity, surface morphologies and composition of the as-synthesized materials was confirmed through various physicochemical techniques namely XRD, Raman, electron microscopy and energy dispersive spectroscopy. As electrode materials, the CuSbS2 pyramids display a higher specific capacitance of 172.28 Fg−1 at 0.6 Ag−1 as compared to other reports of similar ternary sulphides. Moreover, the capacity retains 92.9% of its initial value even after 5000 cycles at high current of 5 Ag−1. The admirable electrochemical performance could be attributed to the faceted structures facilitating large ion interaction and improved ion transfer along the facets for enhanced pseudocapacitive storage.