Rare earth ion-doped CeO 2 has attracted more and more attention because of its special electrical, optical, magnetic, or catalytic properties. In this paper, a facile electrochemical deposition route was reported for the direct growth of the porous Gd-doped CeO 2. The formation process of Gd-doped CeO 2 composites was investigated. The obtained deposits were characterized by SEM, EDS, XRD, and XPS. The porous Gd 3+doped CeO 2 (10 at% Gd) displays a typical type I adsorption isotherm and yields a large specific surface area of 135 m 2 /g. As Gd 3+ ions were doped into CeO 2 lattice, the absorption spectrum of Gd 3+-doped CeO 2 nanocrystals exhibited a red shift compared with porous CeO 2 nanocrystals and bulk CeO 2 , and the luminescence of Gd 3+-doped CeO 2 deposits was remarkably enhanced due to the presence of more oxygen vacancies. In addition, the strong magnetic properties of Gd-doped CeO 2 (10 at% Gd) were observed, which may be caused by Gd 3+ ions or more oxygen defects in deposits. In addition, the catalytic activity of porous Gd-doped CeO 2 toward CO oxidation was studied.

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