Hydrothermally synthesized copper-doped cadmium oxide nanomaterials: Electrochemical and corrosion study for its symmetric supercapacitive device

초록

The escalating global demand for efficient and sustainable energy storage devices has intensified research into high-performance electrode materials for supercapacitors. Transition metal oxides, particularly cadmium oxide (CdO), offer promising electrochemical characteristics but suffer from limited conductivity and cycling stability. In this study, the hydrothermal synthesis of copper-doped cadmium oxide (Cu–CdO) porous nano broad grains is presented as an advanced electrode material for supercapacitor applications. A single-step hydrothermal approach was employed to achieve porous nano-broad grains of copper-doped cadmium oxide. XRD, FTIR, and XPS studies confirm face centered cubic structure of copper-doped cadmium oxide. FESEM and TEM studies show porous nano-broad grain morphology. Electrochemical testing in a three-electrode system revealed that 0.6 % copper-doped CdO exhibits an outstanding specific capacitance of 260 F·g−1 at a scan rate of 5 mV·s−1. Furthermore, the optimized copper-doping CdO electrode delivers an exceptional Specific energy of 424 Wh·kg−1 and a Specific power of 138.76 kW·kg−1 at a current density of 1 mA·cm−2. The symmetrical supercapacitor device was fabricated using copper-doped CdO electrodes. It shows 69.26 F/g specific capacitance at scan rate 5mV/s with energy density 4.56 Wh/kg and power density 0.41 kW/kg, respectively. The device shows good cyclic stability of 70 % after the 4000 CV cycles.

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