Impedance Characteristics and Electrical Double Layer Capacitance of Polystyrene Based Nickel Arsenate Membrane

Polystyrene-based nickel arsenate membranes were prepared by sol-gel method forvarious electrolytes (kcl and nacl) at different concentrations and found to be quite stable.the membrane capacitance and resistance obtained values were found to dependent on theconcentration of the electrolyte and to depend on the applied oscillator frequency atisothermal temperature (25 ? 0.1°c). the electrical double-layer at the membrane-electrolyteinterface was influenced and controlled by the transport of ions. an increase in concentrationof electrolyte solution causes the counter ions in the form of double-layer to be pushed insidethe membrane. thus, the membrane becomes more conductive to the incoming ions, which inturn, supports the trend in the behaviour of the membrane resistance under discussion.deviations from the ideal behaviour in the lower frequency range were attributed to the nonhomogeneousnature of the membrane used in the investigation.