Influence of tungsten content on the electrochemical performance of CuWO4 nanoparticles for supercapacitor applications

The infleuence of composition on the physicochemical properties and electrochemical performance of CuWO4
Nanoparticles with various tungsten contents synthesized by a sol-gel method were investigated for supercapacitors
Applications. X-ray diffraction confirmed the formation of crystalline CuWO4 while the characteristic Cu–O and
W–O vibrations were observed by Raman spectroscopy. SEM-EDX analysis showed uniform morphology and suitable elemental composition. The electrochemical studies using cyclic voltammetry and galvanostatic charge discharge techniques revealed pseudocapacitive behavior due to reversible Cu2+/Cu+ and W6+/W5+ redox reactions. The CuWO4 (1:1) sample showed the highest specic capacitance of 204.5 F g1 at 0.25 A g1 due to its optimized Cu–O–W framework, higher electroactive surface area, and improved charge transport. These results highlight the critical role of tungsten content in tuning structure-property relationships and demonstrate the potential of CuWO4 nanoparticles as efcient electrode materials for supercapacitor applications.