Hydrothermally synthesized various morphological CuO nanoparticles for stable and enhanced supercapacitor applications

Abstract

Abstract Copper oxide nanoparticles (CuO-NPs) were synthesized by a hydrothermal method with different morphologies including nanorod, spherical, rock like and plate. Their structural properties, functional groups, surface morphology, pore size distribution and electrochemical properties were studied by different techniques like X-ray diffraction, vibrational spectroscopy, Scanning Electron Microscopy and cyclic voltammetry. XRD analysis confirmed the formation of orthorhombic structure with reduced crystallite size of 13.23 nm. The surface morphology and average particle size were identified by SEM. FTIR studies expressed the presence of vibrational bands in range of 493 cm-1 and 610 cm-1 ascribed to CuO bonds, respectively. XPS analysis showed the oxidation state of the presented elements in prepared sample. Typical pseudocapacitance behavior was recorded for CuO electrode, which shows the specific capacitance value of 197 Fg−1 at 10 mVs-1. The cyclic stability of synthesized electrode material showed the maximum of 77.24 % retention in the electrode. Moreover, the electrochemical impedance spectral analysis revealed the excellent rate-capability and reversible nature of the CuO electrode. In conclusion, the electrochemical properties of CuO nanoparticle electrodes proved their viable applicability for the development of high-performance supercapacitors.