Comparative study of photocatalytic and photoelectrocatalytic properties of alachlor using different morphology TiO2/Ti photoelectrodes

Effect of the Morphology of TiO2/Ti Electrodes on Photoactivity in the Electrochemical Reduction of Carbon Dioxide

“…Table 1 shows a considerable concurrent enhancement of the counter-electrode potential. The increase in the activity of these electrodes can probably be attributed to improved contact between the metal base and the semiconductor [4], which enhances the efficiency of transfer of the electrons photogenerated in TiO 2 to the copper cathode. Upon the action of ultraviolet light, the TiO 2 nanotubes displayed the greatest activity among the samples studied both in increasing the current density (Fig.…”

“…Such an increase in photoactivity may be attributed to the ordered tubular structure of the photoelectrode, which facilitates the directed motion of both the electrons along the tube walls to the metal base and of the valence band holes to the TiO 2 surface. As a result, the probability of separation of the electrons and the holes photogenerated in the semiconductor is markedly enhanced and, consequently, the rate of electron-hole recombination is reduced [4]. In the case of mesoporous titanium dioxide films, there may be diffusional hindrance to bringing the reducing agent and removing the oxidation products from the TiO 2 surface in the pores, which hinders efficient occupancy of the photogenerated holes and, as a result, enhances electron-hole recombination.…”

“…Intensive research is now underway on the photoelectrochemical production of organic compounds from carbon dioxide using various semiconductor electrodes [3]. However, there has been hardly any systematic investigation of the role of the morphology of semiconductor photoelectrode in the photoelectrochemical reduction of CO 2 even though this factor is known to have a significant effect on the activity of such electrodes [4].…”

“…Intensive research is now underway on the photoelectrochemical production of organic compounds from carbon dioxide using various semiconductor electrodes [3]. However, there has been hardly any systematic investigation of the role of the morphology of semiconductor photoelectrode in the photoelectrochemical reduction of CO 2 even though this factor is known to have a significant effect on the activity of such electrodes [4].In the present work, we investigated the relationship between the morphology of the surface of TiO 2 /Ti electrodes, obtained both by electrochemical anodization under various conditions and by the sol-gel method, and the activity of these materials as anodes in the photoelectrochemical reduction of CO 2 . …”

Enhanced Photocatalytic Decomposition of Gaseous Isopropyl Alcohol in a Polymer Electrolyte Cell

“…(Ku et al, 2011a, b) on photocatalyst surface and modifying the structure of photocatalyst (nanotube, nanorod, etc.) (Wang et al, 2009;Ku et al, 2010b, c;Xin et al, 2011), and process intensification via addition of sacrificial agent (methanol, ethanol, Na 2 S, ethylene diamine tetraacetic acid, etc.) (Galińska and Walendziewski, 2005;Ku et al, 2011a) or application of bias potential (Ku et al, 2006;Ku et al, 2010a;Shang et al, 2011).…”