| TiO2 is a kind of good photocatalyst,which can improve the photocatalytic activity by using the special active crystal surface.In this paper,we use the special exposed surface of the crystal as a substrate to construct a heterojunction with high efficiency.The anatase TiO2 with {001} main burst appearance was chosen to compound MoS2,and finally the MoS2/TiO2(001)heterojunction was obtained.In this system,the exposed surface of the MoS2 epitaxial growth on the {001} surface of anatase TiO2 will encounter much smaller resistance.As a comparison group,MoS2 epitaxial growth on the {101} surface of the P25 type TiO2,it is proved that the substrate of {001} surface is the key factor to the synthesis of this heterojunction structure.MoS2/TiO2(001)heterojunction is proved to be an ideal transmission channel,which can extend the separation time of the carriers to enhance the photocatalytic efficiency.This study proposes a new method for constructing high carrier transport efficiency by using special crystal surface substrate.With the idea and method of the same,we also conducted a similar study on WS2,WS2 and P25 found that the performance of the composite ratio WS2 and {001} facets of TiO2 composite is excellent,therefore,we propose a double heterostructure synergy theory: a crystal heterojunction between {001} facets and {101} facets,a semiconductor heterojunction exists between TiO2 and WS2,which {001} facets of TiO2 plays a role of intermediary stations.After photocatalytic test,the WS2/TiO2(101)material also has a good degradation effect.Finally,we also tested the electrical characteristics of MoS2/TiO2(001)surface as the electrode,it can be found that the composite material is not more suitable than TiO2 as a super capacitor. |
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