Comparing the photocatalytic activity of TiO2 at macro- and microscopic scales
2017
Torras-Rosell, Antoni | Johannsen, Sabrina Rostgaard | Dirscherl, Kai | Daviðsdóttir, Svava | Jeppesen, Christian Sloth | Louring, Sascha | Andersen, Inge Hald
This study focuses on the characterization of photocatalytic TiO₂ coatings using Kelvin probe force microscopy. While most photocatalytic experiments are carried out at a macroscopic scale, Kelvin probe force microscopy is a microscopic technique that is surface sensitive. In order to link microscale results to macroscopic experiments, a simple method to establish the relation between Kelvin probe force microscopy and electrochemical measurements is presented by the calibration of a reference sample consisting of epitaxial deposited Cu-Ni-Au that is used as a transfer standard. The photocatalytic properties of TiO₂ at macro- and microscopic scales are investigated by comparing photocatalytic degradation of acetone and electrochemical experiments to Kelvin probe force microscopy. The good agreement between the macro- and microscopic experiments suggests that Kelvin probe force microscopy can be a valuable tool towards the understanding, standardization and design of TiO₂-based solutions in photocatalytic applications.
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