Enhanced Electrochemical Performance of Er2O3/ZnWO4 Composite for High-Efficiency Supercapacitor Applications. | ||||
| Mansoura Journal of Chemistry | ||||
| Volume 68, Issue 2, May 2025, Page 37-42 PDF (893.36 K) | ||||
| Document Type: Research Article | ||||
| DOI: 10.21608/mjcc.2025.388919.1013 | ||||
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| Authors | ||||
Menna Abdelrahman Khedr  1; Awad Ibrahim Ahmed2; elsayed abdelazim el-sharkawy3
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| 1Department of chemistry, faculty of science, Mansoura university | ||||
| 2Chemistry Department, Faculty of Science, Mansoura University | ||||
| 3Chemistry Department, Faculty of Science, Suez University | ||||
| Abstract | ||||
| This study investigates the electrochemical performance of ZnWO₄ and Er2O3/ZnWO4 composites as potential supercapacitor electrode materials. Using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS), the capacitive behavior, charge transfer kinetics, and stability of the materials were thoroughly evaluated. Results demonstrate that the Er2O3/ZnWO4 composite exhibits significantly enhanced specific capacitance and longer discharge time compared to pure ZnWO4 alone. This improvement is attributed to the increased pseudocapacitive contribution from Er2O3 and its synergistic interaction with ZnWO4. Nyquist plot analysis revealed a lower charge-transfer resistance and better ion diffusion in the composite, indicating improved faradaic activity and efficient charge storage. The synergistic effect between Er2O3 and ZnWO4 enhances both energy storage capability and cycling stability. These findings highlight the Er2O3/ZnWO4 composite as a promising and efficient electrode material for high-performance supercapacitors, offering excellent and superior electrochemical characteristics over ZnWO4 alone, and promising durability for future energy storage devices. | ||||
| Keywords | ||||
| rare earth metal; energy; zinc tungstate; supercapacitor | ||||
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