Titanium dioxide ( TiO 2) nanoparticles (Nps) were prepared by the hydrolysis of titanium tetraisopropoxide ( TTIP ) in 2-propanol with different water contents (0.5 vol% to 7.2 vol%) at 45 °C. The diameter of the Nps was estimated to be 1.5±0.5 nm ( L - TiO 2) and 3.0±0.6 nm ( S - TiO 2) from the onset wavelength in the absorption spectra and by transmission electron microscopy (TEM). A modified Pt electrode with a three-layered sandwich structure was prepared; the outermost and innermost layers were composed of S - TiO 2 and L - TiO 2, respectively, and the middle layer contained 1, 1'-dimethyl-4,4'-bipyridyl ( MV 2+)/Nafion®. Irradiation by a 500 W superhigh-pressure mercury lamp produced electrons in the conduction band of TiO 2. An anodic current was observed after turning off the light. The mechanism by which anodic current is generated after turning off the radiation involves the reduction of MV 2+ to MV +. by photogenerated electrons on the Nps and the diffusion of MV +. in the middle layer. After turning off the irradiation, MV +. transferred an electron to the Pt electrode via holes in the innermost layer or the conduction band of S - TiO 2 coincidentally localized on the Pt electrode, resulting in the generation of the anodic current. The generation of MV +. was confirmed by the absorption spectra of MV +.. As a sacrificial reagent, 2-propanol (0.1 M) was used.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.