Facile microwave combustion synthesis and electrochemical properties of CaMoO4 nanoparticles for high-stability supercapacitors

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Development of science and technology and the depletion of fossil fuel, there has arisen a great demand for alternative energy storage and conversion devices to meet the recurrent need. A novel electrode material, calcium molybdate (CaMoO 4 ) nanoparticles (NPs) has been prepared by the simple microwave combustion method (MCM). The crystalline structure, functional group, morphology, elemental composition, optical properties, and surface chemical configuration of prepared CaMoO 4 NPs have been investigated by different analytical techniques. Besides, cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques have been used to investigate the electrochemical behavior of CaMoO 4 electrode in 1 M KOH electrolyte. CV curves confirmed the pseudocapacitance with the presence of redox pairs and Nyquist plot proving the nature of a supercapacitor of prepared CaMoO 4 NPs. The CaMoO 4 electrode has delivered a high specific capacitance (C sp ) of 87.5 F g −1 at 0.5 A g −1 with retention stability of 88 % even after 10,000 cycles. These significances reveal that the prepared CaMoO 4 NPs have the potential to be used for future trustable energy storage devices.