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Lead-free organic-inorganic hybrid perovskite heterojunction composite for photocatalytic applications

Abstract

The heterojunction structured MASnI3/TiO2 photocatalysts (MA represents CH3NH3+) are prepared via a facile wet-chemical method and characterized by various techniques. The characterizations demonstrate the formation of heterojunction structure and well 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, the 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 high light harvesting ability and easy transfer of photogenerated carriers of the materials generated by the formation of heterojunction structure and the suitable energy band position between MASnI3 and TiO2. Specially, coupling of MASnI3 and TiO2 could also avoid oxidation and hydrolysis of MASnI3 so that it could keep the long-term stability of the composite efficiently. It is the first report that MASnI3 and TiO2 composites are used as photocatalysts for dye degradation. A possible mechanism for the enhancement of photocatalytic activity under light irradiation is also proposed.

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Publication details

The article was received on 01 Mar 2017, accepted on 14 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7CY00389G
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Lead-free organic-inorganic hybrid perovskite heterojunction composite for photocatalytic applications

    W. Zhang, Q. zhao, X. Wang, X. yan, J. Xu and Z. Zeng, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY00389G

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