A Study on the compatibility of AWO₄ nanoceramics (A=Zn, Mg and Mn) for applications in energy storage devices

Abstract Transition metal oxides are widely studied in different fields of science and technology for their applications such as sensors, scintillators, photo detectors etc. Nowadays their capability as super capacitors are also explored. In the present work, the electrochemical properties of AWO 4 nanoparticles with A site occupied by zinc, magnesium, or manganese were discussed. AWO 4 nanoparticles (A=Zn, Mg or Mn) were synthesized though a modified combustion method. XRD and FTIR spectroscopic techniques were used for analysing the morphology of these compounds. ZnWO 4 and MnWO 4 are found to possess monoclinic structure while MgWO 4 is found to possess tetragonal structure. The characteristic vibration peaks were observed in the FTIR spectra for ZnWO 4 , MgWO 4 and MnWO 4 . CV analysis was performed to understand the electrochemical characteristics. The specific capacitance of the samples is in the order MnWO 4 > MgWO 4 > ZnWO 4 . The ac impedance spectrum for all the samples showed a steep straight line in the high frequency region showing good electrical conductivity. The results suggest that the materials can be molded as good candidates for electrode materials in energy storage devices.