caa a22 4500 477051480 CHVBK 20180405111340.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00364070 doi (NATIONALLICENCE)springer-10.1007/BF00364070 The pH-dependence of thermally-coated Ti/TiO2 electrodes in the absence and presence of nitrobenzene [Elektronische Daten] [C. Ravichandran, M. Noel, P. Anantharaman] Cyclic voltammetric measurements on thermally coated Ti/TiO2 electrodes in 0.05-3.0 m H2SO4, Na2SO4 and NaOH media were carried out to evaluate the cause of pH sensitivity of these electrodes. The electrode activity decreased in the order H2SO4 > NaOH > Na2SO4. Ionic strength had a significant influence on the electrode activity. In the redox catalysis of nitrobenzene reduction the pH dependence increased significantly. The electrode activity again decreased in the same order. In acid media the TiO2 surface is protonated. In alkaline media OH- ions are specifically adsorbed on the TiO2 surface. The concentration of these charged species, as well as the ease of counter ion transport through the charged layers during surface redox reactions in the oxide layer, is identified as the cause of the pH sensitivity of the electrodes. In acid media proton transport in the film occurs through a ‘surface Grothus'-like mechanism. In alkaline medium proton abstraction by OH− ions from the trapped H2O molecules may facilitate proton transport. Chapman & Hall, 1996 Ravichandran C. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut Noel M. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut Anantharaman P. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/2(1996-02-01), 195-201 0021-891X 26:2<195 1996 26 10800 https://doi.org/10.1007/BF00364070 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00364070 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ravichandran C. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut NATIONALLICENCE 700 1- Noel M. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut NATIONALLICENCE 700 1- Anantharaman P. Central Electrochemical Research Institute, 623 006, Karaikudi, India aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/2(1996-02-01), 195-201 0021-891X 26:2<195 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer