Elucidate the pseudocapacitive behaviour of CuWO4 electrode synthesized by solid-state reaction

• Published in: Journal of materials science. Materials in electronics 2020-07, Vol.31 (13), p.10142-10150
• Main Authors: Balasubramanian, V., Kannan, S., Nishanthi, S. T., Sivakumar, G., Mohanraj, K.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Charge transfer; Chemical synthesis; Chemistry and Materials Science; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode materials; Electrodes; Energy storage; Functional groups; Materials Science; Microspheres; Morphology; Optical and Electronic Materials; Solid state; Spectrum analysis; Structural analysis
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03559-5

The present work aims to synthesize CuWO 4 particles via the traditional solid-state reaction method and to study the electrochemical performance of the electrode material for energy storage application. Pseudocapacitive charge storage mechanism is involved in the electrochemical redox reaction. The structural analysis was carried out using X-ray diffraction analysis which confirms the triclinic CuWO 4 obtained. The presence of functional groups of Cu–O and W–O vibrations was confirmed by FTIR spectra. Surface morphology study revealed that the particles are uniformly arranged in the form of microspheres in different sizes. Cyclic voltammetry and electrochemical impedance spectroscopy measurements were performed to study the energy storage applications. It is noticed that CuWO 4 annealed at 500 °C showed higher-specific capacitance of 168.08 F/g at a current density of 1 A/g. From the EIS analysis, the solution resistance and charge-transfer resistance were measured.