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Designed Construction of SrTiO3/SrSO4/Pt Heterojunctions with Boosted Photocatalytic H2 Evolution Activity |
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| Authors: | Jingyi Cai Haoshan Wei Prof Yong Zhang Rui Cai Dr Xueru Zhang Prof Yan Wang Prof Jiaqin Liu Prof Hark Hoe Tan Prof Ting Xie Prof Yucheng Wu |
| Institution: | 1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009 Anhui, China
Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei, 230009 China;2. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009 Anhui, China;3. Instrumental Analysis Center, Hefei University of Technology, Hefei, 230009 China;4. Institute of Industry & Equipment Technology, Hefei University of Technology, Hefei, 230009 Anhui, China;5. China International S&T Cooperation Base for Advanced Energy and Environmental Materials, Hefei, 230009 Anhui, China Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, ACT, 2601 Australia;6. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei, 230009 China |
| Abstract: | Efficient separation of photogenerated electron–hole pairs is a crucial factor for high-performance photocatalysts. Effective electron–hole separation and migration could be achieved by heterojunctions with suitable band structures. Herein, a porous SrTiO3/SrSO4 heterojunction is prepared by a sol-gel method at room temperature followed by an annealing process. XRD characterization suggests high crystallinity of the heterostructure. A well-defined interface between the two phases is confirmed by high-resolution (HR)TEM. The photocatalytic H2 evolution productivity of the SrTiO3/SrSO4 heterojunction with Pt as co-catalyst reaches 396.82 μmol g?1 h?1, which is 16 times higher than that of SrTiO3/Pt. The boosted photocatalytic activity of SrTiO3/SrSO4/Pt can be ascribed to the presence of SrSO4, which promotes the transfer and migration of photogenerated carriers by forming the heterojunction and porous structure, which provides a large amount of active sites. This novel porous heterostructure brings new ideas for the development of high-efficiency photocatalysts for H2 release. |
| Keywords: | heterojunctions photocatalysts sol–gel method strontium sulfate strontium titanium oxide |