摘要
This paper describes the effect of the composition of the oxide films on the properties of electrodes Ti/M<sub>x</sub>Ti<sub>y</sub>Sn<sub>z</sub>O<sub>2</sub> (M = Ir or Ru) prepared by the polymeric precursor method. XRD studies showed that the anodes are formed by solid solutions. The electrodes containing IrO<sub>2</sub> exhibit lower activity for the oxygen evolution reaction. The doping of the electrode surface with SnO<sub>2</sub> 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<sub>0.2</sub>Ti<sub>0.3</sub>Sn<sub>0.5</sub>O<sub>2</sub> has lower lifetime, i.e. 6 hours. The 20% decrease in the stoichiometric amount of SnO<sub>2</sub> increases the time to a value above 70 hours, as observed for Ti/Ir<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub>. Electrode Ti/Ru<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub> shows lifetime of 11 hours;therefore IrO<sub>2</sub> is more stable than RuO<sub>2</sub> under the conditions investigated. These results suggest that electrode Ti/Ir<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub> is promising for different applications, such as water electrolysis, capacitors and organic electrosynthesis.
This paper describes the effect of the composition of the oxide films on the properties of electrodes Ti/M<sub>x</sub>Ti<sub>y</sub>Sn<sub>z</sub>O<sub>2</sub> (M = Ir or Ru) prepared by the polymeric precursor method. XRD studies showed that the anodes are formed by solid solutions. The electrodes containing IrO<sub>2</sub> exhibit lower activity for the oxygen evolution reaction. The doping of the electrode surface with SnO<sub>2</sub> 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<sub>0.2</sub>Ti<sub>0.3</sub>Sn<sub>0.5</sub>O<sub>2</sub> has lower lifetime, i.e. 6 hours. The 20% decrease in the stoichiometric amount of SnO<sub>2</sub> increases the time to a value above 70 hours, as observed for Ti/Ir<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub>. Electrode Ti/Ru<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub> shows lifetime of 11 hours;therefore IrO<sub>2</sub> is more stable than RuO<sub>2</sub> under the conditions investigated. These results suggest that electrode Ti/Ir<sub>0.3</sub>Ti<sub>0.4</sub>Sn<sub>0.3</sub>O<sub>2</sub> is promising for different applications, such as water electrolysis, capacitors and organic electrosynthesis.
作者
Jussara F. Carneiro
Jéssica R. Silva
Robson S. Rocha
Josimar Ribeiro
Marcos R. V. Lanza
Jussara F. Carneiro;Jéssica R. Silva;Robson S. Rocha;Josimar Ribeiro;Marcos R. V. Lanza(Instituto de Química de Sao Carlos, USP-Universidade de Sao Paulo, Sao Carlos, SP, Brazil;Departamento de Química, UFES-Universidade Federal do Espírito Santo, Vitória, ES, Brazil;Escola de Engenharia de Sao Carlos, USP-Universidade de Sao Paulo, Sao Carlos, SP, Brazil)
