title: Improvement of gaseous pollutant photocatalysis with WO3/TiO2 heterojunctional-electrical layered system.
abstract: Since the photogenerated holes play a much more important role than electrons in gas-phase photocatalysis, it is better to enrich the holes in the surface of a material system. Here, a novel [interdigital electrode/WO(3)/TiO(2)] heterojunctional-electrical layered (HEL) system is proposed to realize this attempt. The HEL system consists of interdigital electrode, WO(3) layer and TiO(2) layer, and they are orderly printed onto the alumina substrate from bottom to top using the technology of screen printing. It is surprise that the synergistic effect of layered heterojunction and external low bias can strengthen the separation of electron-hole pairs in both TiO(2) and WO(3), and enrich the TiO(2) surface layer with photogenerated holes to degrade the gaseous pollutants. In comparison with the pure TiO(2) film, a 6-fold enhancement in photocatalytic activity was observed using the HEL system by applying a very low bias of 0.2V. Furthermore, the results also showed that the remarkable improvement could not be obtained when either the WO(3) layer or the low external bias was absent.
authors.affiliation: State Key Laboratory of Material Processing and Die & Mould Technology, Nanomaterials and Smart Sensors Laboratory, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Changsheng
authors.initials: C
authors.lastname: Xie
authors.forename: Huayao
authors.initials: H
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Tao
authors.initials: T
authors.lastname: Zou
authors.forename: Dawen
authors.initials: D
authors.lastname: Zeng
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D004785:Environmental Pollutants / Q000302:isolation & purification*; D005740:Gases / Q000302:isolation & purification; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014050:Toluene / Q000302:isolation & purification*; D014414:Tungsten / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D004785:Environmental Pollutants; D005740:Gases; D010087:Oxides; C009495:titanium dioxide; D014050:Toluene; C511604:tungsten oxide; D014025:Titanium; D014414:Tungsten