Abstract: With SnCl₄·5H₂O, Sb₂O₃ and Gd（NO₃）₃ as the raw material, the SnO₂/Sb DSA electrodes doped Gd were prepared by Dip coating method and sol-gel method. Taking phenol as model substrate, the electro-catalytic characteristics of prepared anodes and the relationship between the electro-cata lytic ability and the electrodes structure were investigated. The micrographs, t he crystal structure, the chemical environments of elements and element content on the surface of electrodes were analyzed by SEM, XRD, XPS and EDX. Results il lustrated that the size of SnO₂ crystal particle prepared with sol- gel method is owing to nanometer-size. The crystal particle of electrodes surfac e was integrity and the cracks on the electrode surface were very few and small. Sol-gel method is benefit to come together of the amounts of SnO₂, G d₂O₃ and the oxygen vacancy in SnO₂ crystal lattice, and resulting in the variation o f electro-catalytic characteristics of DSA electrodes.

Key words: rare earth, dimensionally stable anodes, doping, phenol