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Advanced energy materials: photocatalysis of single domain ferroelectric nanomaterials: enhanced photodegradation efficiency by polar structure

wallpapers News 2020-12-21
Due to the existence of ferroelectric domains domain walls induced by spontaneous polarization in the crystal structure

ferroelectric materials show unique storage sensing other characteristics have been widely used in ultrasonic pyroelectric photovoltaic devices for a long time. In recent years the application of ferroelectric materials in the field of photocatalysis has also received extensive attention. Photocatalysis is a kind of photocatalysis technology which can produce photocatalysis photocatalysis materials. In the process of photocatalysis the key problem to improve the conversion efficiency of solar energy is to improve the separation efficiency of photo generated carriers (electron hole). Different from ordinary semiconductors ferroelectric materials have stable internal electric field due to their polarization structure which can improve the efficiency of photogenerated electron hole separation thus solving the core problem of limiting the efficiency of solar energy conversion. Previous studies on

based on single crystal multi domain BaTiO3 show that the existence of polarization can increase the carrier lifetime from microsecond level to millisecond level. Domain walls often play a very important role in the study of ferroelectric materials. Therefore in the study of multi domain ferroelectric materials there is a basic physical problem to be solved: if there is no domain wall contribution can the polarization in single domain materials improve the carrier separation efficiency obtain higher photocatalytic efficiency? In order to study this problem Professor Yan Haixue Dr. Wang Yaqiong of Queen Mary University London Professor Steve Dunn of South Bank University London their collaborators have synthesized single domain BaxSr1-xTiO3 nanoparticles by molten salt method The photocatalytic degradation of dye rhodamine B by ba0.2sr0.8tio3 with non-polar structure shows that the internal polarization of ferroelectric materials can promote the separation of photogenerated carriers produce higher photodegradation efficiency without domain wall contribution. It is worth noting that due to the size effect of nanoscale ferroelectric materials the characterization of their ferroelectric properties needs to be cautious. When the size of ferroelectric material is less than a certain value (such as BaTiO3 grain size is less than 400 nm) the crystal structure changes from single crystal multi domain to single crystal single domain accompanied by the decrease of spontaneous polarization spontaneous strain ferroelectric Curie point. As a result it is difficult to prove the existence of internal polarization by ordinary XRD or TEM characterization Raman which is more sensitive to structural changes is needed to detect. It is very important to study the photocatalytic properties of nano scale ferroelectric materials. The application of ferroelectric materials in the field of photocatalysis also depends on the development optimization of more material systems. The mechanism of ferroelectric polarization enhanced photocatalytic efficiency will be helpful to design screen new materials.

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