Structure, Optical, Colorimetric, and Supercapacitor Properties of Anode Α-Cuwo4 Crystals

In this work, alpha-copper tungstate (alpha-CuWO4) crystals were prepared by polymeric precursor method. The structural and optical data were performed by X-ray diffraction (XRD), Rietveld refinement, Fourier-transform infrared (FTIR), and ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopies. Moreover, their colorimetric and supercapacitor properties were investigated. Pristine alpha-CuWO4 crystals present a triclinic structure, symmetric and antisymmetric stretch vibrations in the O-Cu-O and O-W-O bonds corresponding to IR-active modes and an optical bandgap value of 2.24 eV. Colorimetric results showed that the alpha-CuWO4 crystals exhibit a brown color to be employed in pigments coating floors. The alpha-CuWO4 crystals present a specific capacitance of 275.68F/g at 5 mV/s to be applied as a stable anodic electrode. These results suggest that alpha-CuWO4 is an excellent candidate as an electrode for energy storage devices in the next generation of batteries.