Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Poster Tuesday: Adsorption and Catalysis

O 40.1: Poster

Tuesday, April 2, 2019, 18:00–20:00, Poster D

Wetting Properties of Electrochemically Active Polycrystalline CuFeO2, CuMO2 and CuFexM1-xO2 Delafossite Porous Surfaces — Robert A. Wheatley, Martin Roble, Sebastian Molina, •Diego Diaz, Susana D. Rojas, Birger Seifert, Sascha Wallentowitz, Donovan E. Diaz-Droguett, and Ulrich G. Volkmann — Institute of Physics and CIEN-UC, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna 4860, Santiago, Chile

Delafossite type ternary oxides are considered favorable catalytic/photo-catalytic materials for a range of chemical reactions. For water-based reactions, hydroxylization, a process connected to the wettability of the surface, can greatly influence catalytic activity of a metal oxide. We investigate the wetting properties of CuFeO2, CuAlO2, CuGaO2 and composite CuFexM1-xO2 Delafossite oxides synthesized using hydrothermal and solid state methods. The materials display significant variance in wetting properties, from highly hydrophobic CuFeO2 as-grown powder, to complete wetting for porous cold-pressed pellets. After annealing treatments at relatively low temperatures T > 300 degree C the surfaces displayed permanent superhydrophilicity and a rapid absorption of H2O droplets via intergranular porosity. Acknowledgements: CONICYT Fellowship (MR) and Anillo CONICYT-PIA ACT 1409.