Cost-effective, environmental friendly electrochemical double-layer capacitor with an optimized electrode composition

For the present world where there is a massive thirst for power, expanding the electricity generation via renewables and storing the production is extremely important. For that, electrochemical double-layer capacitors (EDLCs) provide a notable contribution. However, the trend towards green technology as well as economical aspects has highlighted the necessity for exploring suitable electrodes and electrolytes for EDLCs while assuring satisfactory performance. The present study is about fabricating EDLCs with natural graphite/activated carbon electrodes and a natural rubber-based solid polymer electrolyte. EDLCs were characterized using electrochemical impedance spectroscopy technique, cyclic voltammetry (CV) test and galvanostatic charge–discharge (GCD) test. Electrode composition was varied to optimize the performance. EDLC with the electrode of composition, 10% PVdF: 75% NG: 15% AC showed the highest single electrode specific capacitance ( C sc ) of 7.59 F g −1 . Capacitive features were dominant at low frequencies. The width of cycling potential window and the scan rate govern the performance of EDLC. Continuous performances from CV and GCD tests well proved the stability of the fabricated EDLC to withstand for long-term operation. Results well confirmed the value of continuing further studies to improve performance as this EDLC proves to be a low-cost and safe energy storage device.