CsPbBr_(3)钙钛矿量子点/C_(3)N_(4)超薄纳米片0D/2D复合材料:增强的稳定性和光催化活性

CsPbBr_(3) Perovskite Quantum Dots/Ultrathin C_(3)N_(4) Nanosheet 0D/2D Composite:Enhanced Stability and Photocatalytic Activity

金属卤化物钙钛矿量子点(QDs)具有良好的光电性质,是一种潜在的光催化剂材料。但是,它的稳定性较差,并且电荷传输效率不足,阻碍了其在光催化领域的应用。本工作将CsPbBr_(3)量子点装饰在二维超薄g-C_(3)N_(4)纳米片(UCN)上,制备了0D/2D CsPbBr_(3)/UCN复合光催化剂。引入UCN不仅可以通过钝化CsPbBr_(3)量子点的表面配体来提高CsPbBr_(3)量子点的稳定性,而且两者的能带匹配还可以促进两种材料之间的电荷转移。因此,所制备的CsPbBr_(3)/UCN异质结构比单纯的CsPbBr_(3)量子点和UCN具有更优越的光催化性能,这为设计具有高稳定性和光催化活性的基于CsPbX3的异质结构提供了有效的策略。

Metal-halide perovskite quantum dots(QDs)have emerged as a potential photocatalyst owing to their remarkable optoelectronic properties.However,the poor stability and insufficient charge transportation efficiency of this type of materials hindered their applications in the photocatalysis field.Herein,we decorated CsPbBr_(3) QDs on two-dimensional(2D)ultrathin g-C_(3)N_(4)(UCN)nanosheets to develop a 0D/2D CsPbBr_(3)/UCN composite photocatalyst.The introduction of UCN can not only improve the stability of CsPbBr_(3) QDs by passivating the surface ligands of CsPbBr_(3) QDs,but also facilitate the charge transfer due to the suited band gap alignment.Consequently,the obtained CsPbBr_(3)/UCN heterostructure exhibited superior photocatalytic performance to both pristine CsPbBr_(3) QDs and UCN.This work has provided an efficient strategy for the design of CsPbX3-based heterostructure with high stability and photocatalytic activity.