Titanium anodes coated with a ternary iridium, antimony, and tin oxide mixture (Ti/IrOx-Sb2O5-SnO2) were investigated for oxygen evolution. In the active oxide coating, SnO2serves as a dispersing agent, Sb2O5as a dopant, and IrOxas a catalyst. Experimental results showed that the Ti/IrOx-Sb2O5-SnO2electrode containing only 10 mol % of IrOxnominally in the coating had a service life of 1600 h in 3 M H2SO4solution under a current density of 1 A cm-1at 35°C, compared with 355 h for Ti/IrOxunder the same conditions. Instrumental analysis indicated that the IrOx-Sb2O5-SnO2was a metastable solid solution with a compact structure, which contributes to the superstable nature of the electrode together with the good conductivity and the improvement of bonding with the TiO2interlayer formed during calcination.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry