Lead-free organic–inorganic hybrid perovskite heterojunction composites for photocatalytic applications. Issue 13 (31st May 2017)

• Record Type: Journal Article
• Authors: Zhang, Weining; Zhao, Qingguo; Wang, Xiaohong; Yan, Xiaoxia; Xu, Jiaqiang; Zeng, Zhigang
• Is Part Of: Catalysis science & technology. Volume 7:Issue 13(2017)
• Page Start: 2753
• Page End: 2762
• Publication Date: 2017-05-31
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c7cy00389g
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Heterojunction structured MASnI3 /TiO2 photocatalysts (MA represents CH3 NH3 + ) are prepared via a facile wet-chemical method and characterized by various techniques. Abstract : Heterojunction structured MASnI3 /TiO2 photocatalysts (MA represents CH3 NH3 + ) are prepared via a facile wet-chemical method and characterized by various techniques. The characterization demonstrates the formation of a heterojunction structure and the good crystallinity of MASnI3 /TiO2 (1 : 9) (mass ratio of MASnI3 and TiO2 is 1 : 9). Moreover, the results also display the improved visible light absorption of MASnI3 /TiO2 (1 : 9) and low recombination of photoinduced carriers. As a result, MASnI3 /TiO2 (1 : 9) could completely degrade rhodamine B (97%) in 40 min, which has higher photocatalytic ability than pure MASnI3 and pure TiO2 . The improved photocatalytic activity could be ascribed to the improved light harvesting ability and easy transfer of photogenerated carriers of the materials generated by the formation of a heterojunction structure and the suitable energy band position between MASnI3 and TiO2 . In particular, coupling of MASnI3 and TiO2 could also avoid oxidation and hydrolysis of MASnI3 so that the long-term stability of the composite could be efficiently maintained. It is the first report on MASnI3 and TiO2 composites being used as photocatalysts for dye degradation. A possible mechanism for the enhancement of photocatalytic activity under light irradiation is also proposed.