Application of PVA–chitosan blend polymer electrolyte membrane in electrical double layer capacitor

The highest conducting sample 11 wt-% poly(vinyl alcohol)+7 wt-% chitosan–12 wt-% ammonium nitrate (NH4NO3)–70 wt-% ethylene carbonate in the poly(vinyl alcohol)–chitosan–NH4NO3–ethylene carbonate solid polymer electrolyte system has been used in the fabrication of an electrical double layer capacitor (EDLC). The solid polymer electrolyte has been prepared by the solution casting method, and the Dr Blade method is used in the preparation of the electrodes. The conductivity of the film is 1·60×10−3 S cm−1 at room temperature. From linear sweep voltammetry, the decomposition voltage of the electrolyte material is ∼1·70 V. The EDLC has been cycled 100 times at 0·095 and 0·381 mA cm−2 current densities. The capacitance of the EDLC is 27·1 and 16·7 F g−1 for the current density applied at 0·095 and 0·381 mA cm−2 charge–discharge currents respectively.