Premium
Ethanol Oxidation on Electrocatalysts Obtained by Spontaneous Deposition of Palladium onto Nickel‐Zinc Materials
Author(s) -
Bambagioni Valentina,
Bianchini Claudio,
Filippi Jonathan,
Oberhauser Werner,
Marchionni Andrea,
Vizza Francesco,
Psaro Rinaldo,
Sordelli Laura,
Foresti Maria Luisa,
Innocenti Massimo
Publication year - 2009
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.200800188
Subject(s) - palladium , nickel , zinc , inorganic chemistry , transmetalation , glassy carbon , transition metal , materials science , redox , ethylene glycol , aqueous solution , deposition (geology) , chemistry , catalysis , electrochemistry , metallurgy , cyclic voltammetry , electrode , organic chemistry , paleontology , sediment , biology
Ni‐Zn and Ni‐Zn‐P alloys supported on Vulcan XC‐72 are effective materials for the spontaneous deposition of palladium through redox transmetalation with Pd IV salts. The materials obtained, Pd‐(Ni‐Zn)/C and Pd‐(Ni‐Zn‐P)/C, have been characterized by a variety of techniques. The analytical and spectroscopic data show that the surface of Pd‐(Ni‐Zn)/C and Pd‐(Ni‐Zn‐P)/C contain very small, highly dispersed, and highly crystalline palladium clusters as well as single palladium sites, likely stabilized by interaction with oxygen atoms from NiO moieties. As a reference material, a nanostructured Pd/C material was prepared by reduction of an aqueous solution of PdCl 2 /HCl with ethylene glycol in the presence of Vulcan XC‐72. In Pd/C, the Pd particles are larger, less dispersed, and much less crystalline. Glassy carbon electrodes coated with the Pd‐(Ni‐Zn)/C and Pd‐(Ni‐Zn‐P)/C materials, containing very low Pd loadings (22–25 μg cm −2 ), were studied for the oxidation of ethanol in alkaline media in half cells and provided excellent results in terms of both specific current (as high as 3600 A g(Pd) −1 at room temperature) and onset potential (as low as −0.6 V vs Ag/AgCl/KCl sat ).