Abstracts Book - IMRC 2018

• SF5-P057
INFLUENCE OF TITANIUM SURFACE TREATMENT ON THE
PROPERTIES OF Ti/SnO2-Sb ELECTRODES
Jazmín Andrade 1 , Teresa Zayas 2 , Leonardo Salgado 3
1 Benemerita Universidad Autonoma de Puebla, Posgrado en Ciencias Ambientales, Mexico.
2 Benemerita Universidad Autonoma de Puebla, Centro de Química, Mexico. 3 Universidad
Autónoma Metropolitana, Chemistry, Mexico.
Ti/SnO2-Sb electrodes have shown excellent properties for application in the
electrooxidation of organic matter, however, the main disadvantage of these
electrodes is their short operating time. It has been suggested that the short life
time is associated with the presence of TiO2 during the formation of the SnO2-Sb
film on titanium or during its application as anode (Ti/SnO2-Sb). Therefore, one of
the purposes in the research of Ti/SnO2-Sb anodes is to minimize the proportion of
TiO2 in order to obtain electrodes with high stability.
In this work we report the study of the influence of substrate surface treatment
(titanium) on the properties of the Ti/SnO2-Sb electrodes. The substrate was
subjected to three treatment stages: mechanical (sandpaper), degreased (acetone
or sodium hydroxide) and chemical attack with different reagents (hydrochloric acid
(HCl) or oxalic acid (C2H2O4) or hydrofluoric/phosphoric acid mixture (HF/H3PO4) and
the overall sequence of the acid pool). A total of eight surface treatments
corresponding to four chemical attacks on two degreasing conditions. The
precursor of Sn-Sb(5% at.) was prepared according to the polymeric precursor
method and was applied to the titanium plates with different surface treatment.
Three layers of precursor were applied to each titanium substrate followed by
thermal decomposition to form the Ti/SnO2-Sb electrodes. Both the substrate and
the Ti/SnO2-Sb electrodes were characterized by SEM, EDS and cyclic voltammetry.
The determination of the active area and the roughness factor were made from
capacitance
measurements.
The results showed that the morphology, the real area and the rugosity factor of
the substrate is markedly influenced by the surface treatment. The trend in the
values of real area and roughness factor of titanium plates with different chemical
attacks is independent of the reagent used in the degreasing stage. On the other
hand, the SnO2-Sb films on the different surface conditions of titanium did not show
the same tendency as the substrate.
Keywords: Titanium substrate, Pre-treatment., Ti/SnO2-Sb electrodes
Presenting authors email: lsj@xanum.uam.mx