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Study on Relation between Band Structure of Thin TiO2 Photoelectrode and Catalytic Activity with Electrochemistry Impedance Spectroscopy

Author: KongHaiXia
Tutor: SunYanPing
School: Taiyuan University of Technology
Course: Applied Chemistry
Keywords: Electrochemical Impedance Spectroscopy Photoelectrocatalysis TiO2 film Equivalent Circuit Band structure Space - charge layer Semiconductor photoelectrode
CLC: O643.3
Type: Master's thesis
Year: 2004
Downloads: 333
Quote: 3
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Abstract


In this thesis, electrochemical impedance spectroscopy (EIS) method, to study the reaction state the TiO 2 Semiconductor a multiphase photoelectrocatalysis system. Experimental M273A potentiostat the 1025m Frequency response analyzer (FRD) and supporting software PowerSuite, measured and analyzed anodized prepared TiO , 2 thin-film photovoltaic pole in the phenol solution dark, light and change anode bias electrochemical impedance spectroscopy. Electrochemical impedance changes angle from the system, discuss the impact of the light or not and the bias voltage on phenol system photoelectrocatalysis process. In subsequent degradation experiments phenol photoelectrocatalysis, conclusions and electrochemical impedance experiments. Use the the supporting equivalent circuit analysis software ZsimpWin dealing with electrochemical impedance data. Systematic analysis of the semiconductor / solution interface characteristics, combined with semiconductor photoelectrode process features proposed three kinds of TiO 2 thin-film photovoltaic-polar system equivalent circuit model. Circuit Description Code (CDC code): model I R (RC) (RQ); model II R (R [CQ]); the model III R (C (R (RQ))). Contrast to TiO 2 thin-film photovoltaic-polar system impedance fitting results, the selected model III of the experimental system the most reasonable equivalent circuit model. Further use of the phenol system equivalent circuit component values, calculated TiO 2 semiconductor band structure parameters - the width of the space charge layer W. The results prove that: when the width W of the space charge layer increases with an anode bias, the TiO 2 thin film electrode photocatalytic activity improved the the phenol degradation speed; when it is equal to the thickness of the film, photocatalytic activity the best, the fastest phenol degradation rate of Taiyuan University of Technology Graduate Thesis, appears the best bias value; bias continues to increase, but declined photocatalytic activity, phenol degradation slows down. Thesis prepared coating method the TIOZ thin-film photoelectric pole, using electrochemical impedance spectroscopy, the inorganic ferrous sulfate system: and further use of traditional cyclic voltammetry control study Ti02 thin film photocatalyst activity. To substantiate the reasonableness of the of the electrochemical impedance spectroscopy study the photoelectrode catalytic activity method. This thesis is initially set up the Electrochemical Impedance Spectroscopy Method characterization of the catalytic activity of a new method of TIOZ semiconductor optoelectronic applied bias in the reaction state.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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