Effect of neodymium doping on the structural and electrochemical behavior of copper oxide for supercapacitor electrode material
摘要
In the present study, microplate-like structure of copper oxide (CuO) and Nd-doped copper oxide (Nd = 1, 3, 5 wt%) were synthesized and characterized with a focus on their electrochemical properties. The CuO irregular microplate-like structures were prepared using a simple, cost-effective precipitation method. X-ray diffraction analysis confirmed the formation of the monoclinic phase of CuO, while scanning electron microscopy revealed a uniform distribution of micro-sheets across the substrate. With increasing neodymium (Nd) concentration, the morphology of the nanostructures became more irregular with a non-porous surface. Furthermore, electrochemical studies, including cyclic voltammetry and electrochemical impedance spectroscopy, confirmed the pseudocapacitive behavior of the CuO nanostructures. The micro-sheets exhibited a high specific capacitance of 280 F/g at a current density of 10 mA/cm2 in 1 M KOH electrolyte. The Ragone plot further highlighted the excellent energy and power densities of the material, indicating its strong potential for energy storage applications. Inclusively, this work demonstrates that the facile synthesis of micro-sheet-like CuO offers a promising pathway for developing other metal oxides, polymers, and related materials for use in electrochemical devices for higher performance.