| Autor: |
Shabalina AV; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia., Gotovtseva EY; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia., Belik YA; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia., Kuzmin SM; G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Science, Akademicheskaja 1, Ivanovo 153045, Russia., Kharlamova TS; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia., Kulinich SA; Research Institute of Science & Technology, Tokai University, Hiratsuka 259-1292, Kanagawa, Japan., Svetlichnyi VA; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia., Vodyankina OV; Tomsk State University, Lenin Av. 36, Tomsk 634050, Russia. |
| Abstrakt: |
Three bismuth silicate-based photocatalysts (composites of Bi 2 SiO 5 and Bi 12 SiO 20 ) prepared via the hydro-/solvothermal approach were studied using electrochemical methods. The characteristic parameters of semiconductors, such as flat band potential, donor density, and mobility of their charge carriers, were obtained and compared with the materials' photocatalytic activity. An attempt was made to study the effect of solution components on the semiconductor/liquid interface (SLI). In particular, the Mott-Schottky characterization was made in a common model electrolyte (Na 2 SO 4 ) and with the addition of glycerol as a model organic compound for photocatalysis. Thus, a medium close to those in photocatalytic experiments was simulated, at least within the limits allowed by electrochemical measurements. Zeta-potential measurements and electrochemical impedance spectroscopy were used to reveal the processes taking place at the SLI. It was found that the medium in which measurements were carried out dramatically impacted the results. The flat band potential values ( E fb ) obtained via the Mott-Schottky technique were shown to differ significantly depending on the solution used in the experiment, which is explained by different processes taking place at the SLI. A strong influence of specific adsorption of commonly used sulfate ions and neutral molecules on the measured values of E fb was shown. |
