Synthesis of In2Se3 homojunction photocatalyst with α and γ phases for efficient photocatalytic performance. (5th August 2018)

• Record Type: Journal Article
• Authors: Wang, Ruimiao; Wan, Jun; Jia, Jia; Xue, Wenhua; Hu, Xiaoyun; Liu, Enzhou; Fan, Jun
• Is Part Of: Materials & design. Volume 151(2018)
• Page Start: 74
• Page End: 82
• Publication Date: 2018-08-05
• Subjects: In2Se3 -- Homojunction -- Solvothermal synthesis -- Photocatalytic H2 evolution -- Removal of Cr(VI); Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.04.052
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Herein, novel γ-In2 Se3 nanoparticle/α-In2 Se3 nanosheet (In2 Se3 NPS) homojunctions were constructed by a facile solvothermal method and applied to photocatalytic H2 production from water splitting and removel of Cr(VI) pollutant for the first time. The photocatalytic H2 evolution rate and Cr(VI) removal rate can reach 1347.6 μmol/(g·h) and 94.9% in 10 min without any co-catalyst over optimal In2 Se3 NPS, which is 4.34 and 4.12 times higher than that of pure γ-phase In2 Se3 nanoparticles. The characterizations of valence band X-ray photoelectron spectroscopy and Mott-Schottky measurement prove that the In2 Se3 NPS homojunction establishes a staggered band alignment to promote the separation and transfer of photogenerated charge carriers. Meanwhile, the hybrid nanoparticle/ nanosheet structure with appropriate proportion, uniform distribution and intimate contact can boost the light trapping and provide more electron trapping sites, resulting in active photocatalytic performance. This work not only enrich In2 Se3 -based semiconductor nanomaterials with a simple synthetic route, but also provide a new sight in design homojunction for efficient photocatalytic applications. Graphical abstracts: The charge transfer process between γ-In2 Se3 nanoparticles and α-In2 Se3 nanosheets in In2 Se3 homojunction.Unlabelled Image Highlights: In2 Se3 homojunction with α and γ phases was successfully synthesized via a facile solvothermal method. In2 Se3 homojunction can achieve photocatalytic H2 -evolution and Cr(VI) removal simultaneously. H2 evolution rate and Cr(VI) removal rate can reach 1347.6 μmol/(g·h) and 94.9% in 10 min without cocatalyst over In2 Se3 homojunction photocatalyst.