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In this present study, semiconductor magnetic α-Fe 2 O 3 /MnO 2 nanocomposites (NCs) were prepared by a facile hydrothermal (HT) method. The crystallographic structure, morphology, chemical configuration and magnetic features were analysed by X-ray powder diffraction (XRD), high resolution scanning electron microscope (HR-SEM), energy dispersive X-ray analysis (EDX), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM) analyses. The as-prepared NCs were used as an electrode in energy storing supercapacitor was systematically examined. The electrochemical deeds of α-Fe 2 O 3 /MnO 2 NCs was analysed by cyclic voltammetry (C–V) and galvanostatic charge–discharge (GCD) tests. The CV analysis of the NCs electrode showed a distinctive pseudocapacitive behaviour in 1 M KOH solution. The NCs electrode reveals enhanced specific capacitance compared to plain α-Fe 2 O 3 and MnO 2 nanoparticles (NPs) and generates high specific capacitance of 216.35 Fg−1. Pseudocapacitor obtains of energy density 135.42 Wh kg−1 at power density of 6.399 kW kg−1, indicating the as-prepared α-Fe 2 O 3 /MnO 2 NCs shows noteworthy high-energy, specific capacitance, power densities and long-standing cyclic stability with 89.2% of preliminary capacitance reserved at 1A g−1 after 10000 cycles in judgement with the pure α-Fe 2 O 3 and MnO 2 NPs electrode. The α-Fe 2 O 3 /MnO 2 NCs electrode having noteworthy electrochemical characteristics performance renders promising applications in energy storing systems. [ABSTRACT FROM AUTHOR]

This paper reports the fabrication of MnO 2 –CuO nanocomposite by a hydrothermal approach for supercapacitor applications. The crystal nature, morphology and chemical states of synthesized MnO 2 –CuO nanocomposite were examined by powder XRD, FT-IR, HRSEM, TEM, EDX, XPS and its electrochemical performance of as prepared nanocomposite materials as supercapacitor electrodes is measured by CV, GCD and EIS, The MnO 2 –CuO nanocomposite shows a higher specific capacitance (279.12 Fg−1) than individual compounds of MnO 2 (175.51 Fg−1) and CuO (191.06 Fg−1) at a current density of 0.5 Ag−1. The cycle life of the composite was also excellent. After 10,000 cycles, it maintained 91.26% of its beginning capacitance. The electrochemical results showed that the MnO 2 –CuO nanocomposite is a suitable material for electrode fabrication of a supercapacitor. • MnO 2 –CuO NCs was fabricated and used as electrodes for supercapacitor requirements. • The crystal nature, morphology and chemical states were studied by various techniques. • Electrochemical performance of the MnO 2 –CuO NCs as supercapacitor electrodes and measured by CV, GCD and EIS. • MnO 2 –CuO NCs has a greater specific capacitance (279.12 F/g) than individual compounds of MnO 2 (175.51 F/g) and CuO (191.06 F/g) with a current density of 0.5 A g−1. • The cycle life of the composite was also excellent, it retained 91.26% of its beginning capacitance until 10,000 cycles. [ABSTRACT FROM AUTHOR]