Author(s)

Jussara F. Carneiro¹, Jéssica R. Silva², Robson S. Rocha³, Josimar Ribeiro^2*, Marcos R. V. Lanza¹

¹Instituto de Química de Sao Carlos, USP-Universidade de Sao Paulo, Sao Carlos, SP, Brazil.
²Departamento de Química, UFES-Universidade Federal do Espírito Santo, Vitória, ES, Brazil.
³Escola de Engenharia de Sao Carlos, USP-Universidade de Sao Paulo, Sao Carlos, SP, Brazil.

This paper describes the effect of the composition of the oxide films on the properties of electrodes Ti/M_xTi_ySn_zO₂ (M = Ir or Ru) prepared by the polymeric precursor method. XRD studies showed that the anodes are formed by solid solutions. The electrodes containing IrO₂ exhibit lower activity for the oxygen evolution reaction. The doping of the electrode surface with SnO₂ improves the catalytic properties of the anodes. However, it should be held in appropriate compositions, because the change in the atomic ratio of this element shows a marked effect on the stability of the oxides. Electrode Ti/Ir_0.2Ti_0.3Sn_0.5O₂ has lower lifetime, i.e. 6 hours. The 20% decrease in the stoichiometric amount of SnO₂ increases the time to a value above 70 hours, as observed for Ti/Ir_0.3Ti_0.4Sn_0.3O₂. Electrode Ti/Ru_0.3Ti_0.4Sn_0.3O₂ shows lifetime of 11 hours; therefore IrO₂ is more stable than RuO₂ under the conditions investigated. These results suggest that electrode Ti/Ir_0.3Ti_0.4Sn_0.3O₂ is promising for different applications, such as water electrolysis, capacitors and organic electrosynthesis.

Dimensionally Stable Anodes (DSA), Oxide Films, Electrochemical Properties, Polymeric Precursor Method

Carneiro, J. , Silva, J. , Rocha, R. , Ribeiro, J. and Lanza, M. (2016) Morphological and Electrochemical Characterization of Ti/MxTiySnzO2 (M = Ir or Ru) Electrodes Prepared by the Polymeric Precursor Method. Advances in Chemical Engineering and Science, 6, 364-378. doi: 10.4236/aces.2016.64037.