Piezoelectric And Photoelectric Catalytic Properties Of PbTiO₃ And Bi₂MoO₆ Ferroelectric Materials

Perovskite ferroelectric materials are perovskite materials with ferroelectric properties.In recent years,perovskite materials and their applications have become one of the hot research topics in condensed matter physics and solid state electronics.With excellent electron-hole transport performance and ferroelectric characteristics,the records of photoelectric efficiency and catalytic efficiency of perovskite ferroelectric materials have been constantly updated,which is expected to solve the problem of energy shortage and environmental pollution in the future.Therefore,perovskite ferroelectric materials have become a hot research content in the field of catalysis in recent years.And how to further improve the catalytic efficiency of perovskite ferroelectric materials is one of the main research directions in the future.In this paper,PbTiO₃ and Bi₂MoO₆ ferroelectric materials are prepared by hydrothermal method and pulsed laser deposition.It is mainly divided into two research contents:hydrothermal preparation of PbTiO₃ nanometer powders with different morphologies and the study of piezoelectric catalysis and photo-force synergy;Study on photocatalytic performance of Bi₂MoO₆ Thin Films prepared by pulsed laser deposition method.(1)PbTiO₃ nanosheets and nanowires were prepared by hydrothermal method,and piezoelectric catalysis and photo-force cooperative catalysis were carried out.Single crystal PbTiO₃ nanosheets were prepared by using P25 Ti O₂,lead nitrate and 4 mol/L KOH solution with a mixed crystal structure and an anatase to rutile weight ratio of 8:2 at a hydrothermal reaction temperature of 200?.With a certain spontaneous polarization;using 6 mmol of lead acetate trihydrate to prepare one-dimensional PbTiO₃ nanowires with clear structure.After the PbTiO₃ nanosheets are corona polarized,the time for degrading rhodamine B to more than 90%using piezoelectric catalysis is reduced from 4 h to 2 h.Using light energy and mechanical energy for photo-mechanical catalysis,the time for PbTiO₃ catalysis is reduced from 2 h to 10min,and the degradation rate is increased by 91.6%;(2)Bi₂MoO₆ thin film was prepared by pulsed laser deposition system.The preparation conditions of Bi₂MoO₆ thin film were investigated when FTO and ITO were used as the substrate,and the photoelectric catalytic performance of the material was studied.Bi₂MoO₆nanocrystals with large specific surface area were fabricated on an ITO coated glass substrate.And the photoelectrochemical properties of Bi₂MoO₆ nanocrystals were enhanced by manipulating ferroelectric polarization.Compared with the reversible hydrogen electrode,the ITO polarized Bi₂MoO₆ photocurrent density showed a photocurrent density of 250?A/cm² at1.23 V,28%higher than that of the original Bi₂MoO₆ nanocrystals without macro polarization.It is proved that the polarized electric field is beneficial to the separation of photo-excited electron-hole pairs,thus minimizing the recombination of charge carriers and further increasing the photocurrent density,providing a new strategy for the photochemical device based on Bi₂MoO₆.The research in this paper will promote the development of perovskite in the field of catalysis.New ideas and opinions were put forward to improve the catalytic efficiency of perovskite.