AC Impedance and Cyclic Voltammetric Investigations on BIPBVOX Solid Electrolyte

作者：Naqvi Faria K; Beg Saba^*; Al Areqi Niyazi A S

来源：Emerging Materials Research, 2017, 6(2): 348-355.

DOI：10.1680/jemmr.17.00032

Samples of BIPBVOX.x (Bi2V1-xPbxO5.5-x/2), in the composition (x) range 0.05 <= x <= 0.20, were prepared by ethylene glycol citric acid sol gel synthesis route. Structural investigations were carried out by X ray diffraction, Fourier Transform Infra-Red spectroscopy (FTIR) and Differential Thermal Analysis (DTA). The highly conducting gamma '- phase was effectively stabilized at room temperature (35 degrees C) for compositions with x >= 0.17. AC impedance spectra revealed that the conductivity is mainly due to the grain contribution to oxide ion conductivity. At 300 degrees C, the highest value of conductivity (6.234x10(-5) S.cm(-1)) was obtained for composition x = 0.15, while the highest value of conductivity at 600 degrees C (0.65 Scm(-1)) was observed for x = 0.17. Cyclic voltammetric measurements showed reversible redox reactions of vanadium and irreversible redox reaction of Bi3+ in the BIPBVOX system during the first cathodic and anodic sweep. However, a higher stability against the reduction of Bi3+ to metallic bismuth was seen for x = 0.20.

• 出版日期2017-7