Author/Authors :
V.P. Santos، نويسنده , , S.A.C. Carabineiro، نويسنده , , J.J.W. Bakker، نويسنده , , O.S.G.P. Soares، نويسنده , , X. Chen، نويسنده , , M.F.R. Pereira، نويسنده , , J.J.M. ?rf?o، نويسنده , , J.L. Figueiredo، نويسنده , , J. Gascon، نويسنده , , F. Kapteijn، نويسنده ,
Abstract :
Cerium-doped cryptomelane stabilizes polyhedron Au nano-particles smaller than 3 nm. The obtained Au/Ce/cryptomelane catalyst is highly active for CO oxidation. Cationic, neutral, and anionic gold species were found on Ce/cryptomelane. The modification of cryptomelane by the addition of cerium is twofold: (i) cerium is incorporated in the tunnels of cryptomelane, increasing the number of defects which function as nucleation sites for gold and (ii) ceria nano-particles at the surface induce charge transfer between gold and cryptomelane. TOF for Au/Ce–K-OMS-2 is about twice that of Au/CeO2 prepared by the same procedure.
Keywords :
Nanocomposite photocatalyst , Solar hydrogen production , TiO2 nanofiber , Photo(electro)chemical activity , Graphene oxide
