Anomalous Surface Compositions of Stoichiometric Mixed Oxide Compounds

The surface compositions of bulk mixed metal oxides stoichiometric vanadate and molybdate compounds have been systematically examined, for the first time, by combined synchroton-based depth-resolved XPS profile analysis, conventional XPS and LEIS spectroscopy. The outer surfaces of many, but not all, of the bulk mixed vanadates and molybdates tend to be enriched with surface VOx and MoOx species approaching monolayer coverage. Furthermore, this surface enrichment phenomenon can be dramatically enhanced in the presence of minor amount of alkali impurities. These new findings have significant implications for the fundamental understanding of how bulk mixed oxide materials function in numerous technical applications.Fil: Merzlikin, Sergiy V. . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; AlemaniaFil: Tolkachev, Nikolay N. . Russian Academy of Sciences, N. D. Zelinsky Institute of Organic Chemistry; RusiaFil: Briand, Laura Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Strunskus,Thomas . Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wöll, Christof. Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wachs, Israel E.. Lehigh University Bethlehem, Department of Chemical Engineering, Operando Molecular Spectroscopy and Catalysis Laboratory; Estados UnidosFil: Grüenert, Wolfgang . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; Alemani

Anomalous Surface Compositions of Stoichiometric Mixed Oxide Compounds

The surface compositions of bulk mixed metal oxides stoichiometric vanadate and molybdate compounds have been systematically examined, for the first time, by combined synchroton-based depth-resolved XPS profile analysis, conventional XPS and LEIS spectroscopy. The outer surfaces of many, but not all, of the bulk mixed vanadates and molybdates tend to be enriched with surface VOx and MoOx species approaching monolayer coverage. Furthermore, this surface enrichment phenomenon can be dramatically enhanced in the presence of minor amount of alkali impurities. These new findings have significant implications for the fundamental understanding of how bulk mixed oxide materials function in numerous technical applications.Fil: Merzlikin, Sergiy V. . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; AlemaniaFil: Tolkachev, Nikolay N. . Russian Academy of Sciences, N. D. Zelinsky Institute of Organic Chemistry; RusiaFil: Briand, Laura Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Strunskus,Thomas . Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wöll, Christof. Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wachs, Israel E.. Lehigh University Bethlehem, Department of Chemical Engineering, Operando Molecular Spectroscopy and Catalysis Laboratory; Estados UnidosFil: Grüenert, Wolfgang . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; Alemani

Anomalous Surface Compositions of Stoichiometric Mixed Oxide Compounds

The surface compositions of bulk mixed metal oxides stoichiometric vanadate and molybdate compounds have been systematically examined, for the first time, by combined synchroton-based depth-resolved XPS profile analysis, conventional XPS and LEIS spectroscopy. The outer surfaces of many, but not all, of the bulk mixed vanadates and molybdates tend to be enriched with surface VOx and MoOx species approaching monolayer coverage. Furthermore, this surface enrichment phenomenon can be dramatically enhanced in the presence of minor amount of alkali impurities. These new findings have significant implications for the fundamental understanding of how bulk mixed oxide materials function in numerous technical applications.Fil: Merzlikin, Sergiy V. . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; AlemaniaFil: Tolkachev, Nikolay N. . Russian Academy of Sciences, N. D. Zelinsky Institute of Organic Chemistry; RusiaFil: Briand, Laura Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Strunskus,Thomas . Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wöll, Christof. Ruhr-Universitt Bochum, Lehrstuhl Physikalische Chemie; AlemaniaFil: Wachs, Israel E.. Lehigh University Bethlehem, Department of Chemical Engineering, Operando Molecular Spectroscopy and Catalysis Laboratory; Estados UnidosFil: Grüenert, Wolfgang . Ruhr-Universitt Bochum, Lehrstuhl fr Technische Chemie; Alemani