ELECTROCHEMICAL PERFORMANCE AND RATE CAPABILITY ANALYSIS OF MNO₂/CELLULOSE FIBER–DOPED POLYTHIOPHENE COMPOSITE ELECTRODES FOR SUPERCAPACITOR APPLICATIONS
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Abstract
The growing demand for efficient energy storage systems has accelerated the development of advanced electrode materials for supercapacitors. In this study, MnO₂/cellulose fiber–doped polythiophene (PTH) composite electrodes were investigated for electrochemical energy storage applications. Electrochemical characterization was performed using cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) measurements over a range of current densities. A total of 16 electrochemical tests were conducted, generating approximately 129,892 data points, with discharge times ranging from 1.14 to 64.63 minutes, enabling evaluation across a broad range of energy and power conditions.
The CV responses, within a current range of −29.0 mA to +19.3 mA, indicate a combination of electric double-layer capacitance and pseudocapacitive behavior. The electrode operated effectively within a potential window of approximately 1.0 V. The composite exhibited a capacitance retention of up to 78.4% at high discharge rates, demonstrating good rate capability, while a coulombic efficiency exceeding 93% confirmed excellent reversibility. The maximum energy density and power density achieved were 22.5 Wh kg⁻¹ and 936.8 W kg⁻¹, respectively.
These results demonstrate that incorporating MnO₂ and cellulose fiber into the polythiophene matrix enhances electrochemical performance, making the composite a promising candidate for high-performance supercapacitor applications.
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