Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Interfaces II: Segregation and embrittlement
MM 9.4: Vortrag
Montag, 7. März 2016, 12:30–12:45, H39
Effect of Sb segregation on conductance and catalytic activity at Pt/Sb-doped SnO2 interface: a synergetic computational and experimental study — Qiang Fu1,5, Luis César Colmenares Rausseo2, •Umberto Martinez Pozzoni3, Paul Inge Dahl2, Juan Maria García Lastra1, Per Erik Vullum2,4, Ingeborg-Helene Svenum2,4, and Tejs Vegge1 — 1Department of Energy Conversion and Storage, Technical University of Denmark, Lyngby, Denmark — 2SINTEF Materials and Chemistry, Trondheim, Norway — 3QuantumWise A/S, Copenhagen, Denmark — 4Deptarment of Physics, Norwegian University of Science and Technology (NTNU)Trondheim, Norway — 5Current Address: Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany
In this work, the effect of Sb segregation on the conductance and catalytic activity at Pt/Antimony doped tin dioxide (ATO) interface was investigated through a combined computational and experimental study. It was found that Sb-dopant atoms prefer to segregate toward the ATO/Pt interface. The deposited Pt catalysts, interestingly, not only promote Sb segregation, but also suppress the occurrence of Sb3+ species, a charge carrier neutralizer at the interface. The conductivity of ATO was found to increase, to a magnitude close to that of activated carbon, with an increment of Sb concentration before reaching a saturation point around 10%, and then decrease, indicating that Sb enrichment at the ATO surface may not always favor an increment of the electric current.