Ion transport and capacitive properties of RuO2-SnO2 binary films

Abstract: This paper reports the RuO₂-SnO₂ binary film synthesis and the influence of the SnO₂composition increase in the ion transport and pseudocapacitive properties of RuO₂. The binary oxide was synthesized by polymeric precursors method followed deposition on a titanium substrate. XRD analysis showed the phases formed and the crystallites size of the samples. SEM allowed studying the morphology variation of the films with the addition of SnO₂. The material obtained was evaluated by electrochemical techniques in 1 M H₂SO₄electrolyte solution. The voltammograms showed that the pseudocapacitive characteristic of the RuO₂ – SnO₂ binary film remained even for greater amount of SnO₂ in the binary mixture. The electrochemical impedance spectroscopy results are discussed in terms of complex capacitance and complex power. The relaxation time constant of the systems and capacitance values at low frequency, were determinate from complex capacitance plots.

Author(s): Pocrifka, L. A.; Ferreira, C. S.; Aguilera, L.; et al.

Journal of Alloys and Compounds

Volume: 750 Pages: 537-542 Published: 2018

DOI: https://doi.org/10.1016/j.jallcom.2018.04.03302

PDF: Ion transport and capacitive properties of RuO2-SnO2 binary films