Title : Direct growth CoNi LDH on CuO nanowires integrated with RGO electrode for manufacturing of wearable high performance asymmetric supercapacitor as power supply for wearable biosensors
Abstract:
A high-performance asymmetric supercapacitor (ASC) has been developed utilizing CoNi Layered double hydroxide nanosheets (CoNi LDH NSs), which were directly grown on coper oxide nanowires (CuO NWs) and modified reduced graphene oxide on the nickel foam (NF@RGO) serving as the positive and negative electrodes, respectively. Both electrode materials were prepared binder free. the cathode fabricated by etching of copper foam (CF), then electrode annealing and finally an electrochemical deposition method, and an environmentally friendly ultrasonicating of graphene oxide (GO) on NF was placed and reduced it in thermal process for the anode.
The integration of CF@CuO@CoNi LDH NSs and NF@RGO, which were directly deposited on metal foams, results in a significantly low equivalent series resistance and exceptional capacitive performance. The FESEM, EDS, HRTEM and XPS methods were used to study the morphology and elemental analysis of positive and negative electrode nanomaterials. Also, to investigation the functional groups, crystal structure and specific surface, FTIR, Raman, XRD and BET methods were used. Electrochemical methods including cyclic voltammetry (CV) at different scan rates, Galvanostatic chargedischarge (GCD), electrochemical impedance spectroscopy (EIS) were used to check the performance of the supercapacitor.
The assembled ASC demonstrates outstanding capacitive performance across a wide operational potential range, the notable characteristics include specific capacity of 1477.6, 208.7 and 133.3 F gr-1 for positive, negative electrodes and ASC, respectively. and achieving remarkable energy densities of 92.08, 38.3 and 23.1 KWh kg?¹ for positive, negative electrodes and ASC, respectively. Additionally, the power density of the fabricated supercapacitor of 416.66 W kg?¹. these results achieved at a current density of 1 A g?¹ and excellent cycling stability, with capacitance retention exceeding 80% after 7000 cycles. These electrochemical findings indicate that CF@CuO@CoNi LDH NSs//NF@RGO based asymmetric supercapacitors present a promising solution to the challenges of energy scarcity and environmental degradation.
