Preparation of Ce-PbO(2) modified electrode and its application in detection of anilines

The effect of Ce(III) on the morphology and structure of lead dioxide (PbO(2)) modified electrode was studied in this paper. The results obtained by cyclic voltammetry (CV), X-ray diffractometion (XRD) and scanning tunneling micrograph (STM) indicated that the Ce-doped PbO(2) film consisted of a mixture of alpha- and beta-PbO(2) crystallographic phases and the content of alpha-phase was higher than that in undoped PbO(2) film. PbO(2) crystal grains in nanometric size were formed on the electrode surface by doping with Ce. So that the specific surface areas and catalytic active sites of the modified electrode were increased. Hence the catalytic activity of the Ce-PbO(2) modified electrode was evidently greater than the undoped PbO(2) modified electrode. When the Ce-PbO(2) modified electrode was applied as an analytical sensor to determine aniline compounds, the linearity was in the range of 5x10(-5) to 1x10(-3)mol/l and the detection limit was 1x10(-5)mol/l.