Facile one-pot fabrication of quasi-spherical copper oxide electrode for supercapacitor

초록

The chemical bath deposition (CBD) method has been employed to synthesize copper oxide (CuO) thin film electrodes for supercapacitor applications. The as-prepared CuO films were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy to investigate their structural, morphological and surface chemical properties. XRD analysis confirmed the formation of a monoclinic crystal structure with an average crystallite size of 30–35 nm. The FE-SEM images revealed a quasi-spherical like morphology, suggesting enhanced surface area for electrochemical activity. Electrochemical measurements indicated admirable pseudo-capacitive behavior, with a specific capacitance of 565 F/g at a current density of 7 A/g from galvanostatic charge–discharge. The CuO electrode also demonstrates excellent cycling stability, retaining 92.8% of its initial capacitance after 6000 cycles. These results highlight the potential of CBD grown CuO thin films as low cost, high efficiency electrode materials designed for next-generation energy storage technologies exhibit superior charge storage capability, rapid ion transport properties, and excellent cycling durability.

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