Abstract
An applied electric field can enhance the photocatalytic performance of TiO2. However, there has not been a quantitative analysis of the effects of a strong electric field on various intermediates and the degradation of organic matter in the photocatalytic process under certain illumination conditions. The current work uses simulation calculations to explore the effects of an applied electric field on TiO2 photocatalysis. The multi-particle Schrödinger equation is solved by a first-principles approach, and the concentration changes of various substances on the surface of the wire under different electric fields are obtained using a step-by-step reaction equation and Fick’s law. The changes in organic matter concentration during the photocatalytic process caused by the applied electric field were analyzed. Curves of the concentrations of holes, hydroxyl radicals, and organic matter on the surface of the wire under different electric fields were obtained under various temperature and illumination conditions. At the same time, the distribution of organic matter and holes on the surface of the power wires at different times also had been obtained.
Highlights
Owing to the rapid development of power transmission over long distances, many high-voltage direct current (HVDC) transmission lines have been constructed around the world
There has not been a quantitative analysis of the effects of a strong electric field on various intermediates and the degradation of organic matter in the photocatalytic process under certain illumination conditions
Current research does not consider the influence on photocatalytic performance of an external electric field of 20 kV
Summary
Owing to the rapid development of power transmission over long distances, many high-voltage direct current (HVDC) transmission lines have been constructed around the world. Current research does not consider the influence on photocatalytic performance of an external electric field of 20 kV (the electric field strength on the surface of a high-voltage transmission line). Based on the above research, the model in this work is established from first principles using the photocatalytic step-by-step reaction equation and enriches the original photocatalytic degradation organic model It calculates the quantum yield of TiO2 under electric field strengths of 10–40 kV/cm, and simulates the formation of various intermediate products on the surface of the transmission line and the degradation of organic matter, and laid the theoretical foundation for the application of self-cleaning in the field of high-voltage conductors of photocatalytic functional materials in power systems
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