Mixed ionic–electronic conduction and electrochemical behavior of the lead and molybdenum ions in the lead–molybdate–germanate glasses

The structure, ionic conduction and electrochemical performance of a lead–molybdate–germanate glass with the 10MoO3∙90[7GeO2∙3PbO] composition were studied by means of cyclic voltammetry, electrochemical impedance spectroscopy, FTIR, UV–Vis and EPR spectroscopy. The cyclic voltammogram exhibits three distinct maxima attributed to the reduction of Ag+1 to Ag0, Mo+5 to Mo+4 and Pb+2 to Pb0. Nyquist diagram of the complex impedance shows two semicircles which appear in the high and small frequency region and a smaller arc in the intermediate frequency domain corresponds to the Warburg diffusion or/and mass transport impedance of the cell. Analyzing the Nyquist plots of the complex impedance for different silver nitrate electrolyte solution was found good sensing properties of these cells.