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- Title
Enhanced Supercapacitor Performance of Polypyrrole-Coated Graphenized Electrode by Tuning Electrodeposition Technique.
- Authors
AbdelHamid, Ayman A.; Elgamouz, Abdelaziz; Kawde, Abdel-Nasser
- Abstract
The influence of the electrodeposition technique of polypyrrole (PPy) into a three-dimensional graphenized surface on the electrode's physicochemical properties and supercapacitor performance is studied. Three different PPy electrodeposition techniques, potentiodynamic, galvanostatic, and pulse deposition, are investigated, optimized, and compared to the optimal potentiostatic method developed in our previous work. The PPy film morphology, density, homogeneity, and chemical structure are found to be affected by the electrodeposition technique and parameters. Potentiodynamic deposition at 25 mV/s results in the highest areal capacitance of 692.3 mF/cm2, while that at 100 mV/s results in the highest capacity retention of 90.1%. The lowest total electrode resistance of 13.8 Ω and the highest rate capability of 143.2 mF/cm2 at 40 mA/cm2 are both achieved by the galvanostatic method at a current density of 4.05 mA/cm2. A symmetric cell is assembled using the optimal electrode, achieving superior energy densities of 35.95 µWh/cm2 and 21.32 µWh/cm2 at 0.25 mW/cm2 and 20 mW/cm2, respectively. These results shed light on the impact of the PPy electrodeposition technique on graphene/PPy electrodes' electrochemical properties and establish a correlation with the morphology and chemical structure. The study guides future work on PPy electrochemical deposition for energy storage and other applications.
- Subjects
SUPERCAPACITOR performance; SUPERCAPACITOR electrodes; CHEMICAL structure; ELECTRODES; ENERGY storage; ENERGY density; ELECTROPLATING; SUPERCAPACITORS
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2024, Vol 49, Issue 7, p9175
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-023-08516-y