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The influence of SnO2 nanoparticles addition on the corrosion and capacitive behaviour of (SnO2)x(Bi,Pb)-2223, where x=0.00, 0.025, and 0.1wt. % phase superconductor in 0.1 mol L-1 Na2SO4 at 300C was studied using potentiodynamic polarization curves measurements, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques.. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) as well as scanning electron microscopy (SEM). XRD patterns showed that nano-sized SnO2 are located at the surface and grains boundaries reducing the voids present in the (Bi,Pb)-2223 matrix as displayed by SEM photographs. Such fact is confirmed by TEM images that also assured the presence of nanosized SnO2 particles in the phase matrix. The electrochemical techniques showed that the corrosion current density (icorr) decreases with increasing both SnO2 nanoparticles percentages and the time elapsed from the preparation of superconductor samples. Cyclic voltammetry (CV) measurements showed that 0.025% SnO2 containing superconductor is a good choice for electrochemical capacitor applications. The corrosion process was found to be controlled not only by charge transfer, but also by the diffusion process.
Rahal et al. (2017) studied this question.