title: All-printed planar photoelectrochemical cells with digitated cathodes for the oxidation of diluted aqueous pollutants.
abstract: A novel outline of a planar photoelectrochemical cell consisting of a semiconductor layer topped by subsequent layers of a digitated insulator and counter electrode is introduced. The use of vertically separated electrodes represents a major development in reducing the footprint (inactive areas) of planar electrochemical cells. The cells, consisting of a nanoparticular titania photoanode and a digitated, metallic cathode, were fabricated by a strictly additive process employing material printing as the exclusive deposition and patterning tool. Transparent conductive oxide-coated glass and polyethyleneterepthalate sheets were used as substrates; nanocrystalline titania dispersion bonded by a novel organosilica binder was used for the fabrication of the photoanode and gold or carbon inks for the fabrication of the digitated cathodes. Due to the digitated shaping of the cathode, photoelectrochemical response was not suffering from iR drop down to low electrolyte ionic strengths. The printed cells were used for electroassisted photocatalytic degradation experiments with aqueous solutions of coumarin. Considerable acceleration of the coumarin degradation rate compared to the plain photocatalytic mode was observed.
authors.affiliation: Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic. petr@dzik.cz.|Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, 616 00, Brno, Czech Republic. petr@dzik.cz.
authors.forename: Petr
authors.initials: P
authors.lastname: Dzik
authors.affiliation: Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic.|Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, 616 00, Brno, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Veselý
authors.affiliation: Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic.
authors.forename: Martina
authors.initials: M
authors.lastname: Pachovská
authors.affiliation: Groupe d'Étude de la Matière Condensée (GEMaC), CNRS/Université de Versailles/Université Paris-Saclay, 45, avenue des États-Unis, 78035, Versailles CEDEX, France.
authors.forename: Michael
authors.initials: M
authors.lastname: Neumann-Spallart
mesh_terms: D004566:Electrodes; D010084:Oxidation-Reduction; D011327:Printing; D014025:Titanium / Q000737:chemistry*; D014873:Water Pollutants
chemical_list: D014873:Water Pollutants; C009495:titanium dioxide; D014025:Titanium
keywords: Advanced oxidation process; Electrochemistry; Ink-jet; Material printing; Photoelectrocatalysis; Titania; Water treatment