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| Z-scheme bismuth-based multi-site heterojunction: Synthesis and hydrogen production from photocatalytic hydrogen production |
| Author Name | Affiliation | E-mail | | ZHAO Yifan | Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China
Beijing Tongzhou Yunhe Middle School, Beijing 101121, China | | | MAO Qiyun | Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China | | | GUO Meijing | Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China | | | ZHANG Guoying | Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China | | | HU Tongliang | School of Materials Science and Engineering, Nankai University, Tianjin 300350, China | tlhu@nankai.edu.cn |
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| Abstract: A direct Z-scheme 3D Bi2MoO6/Bi2S3 heterojunction with excellent photocatalytic performance for hydrogen (H2) production from water splitting was successfully fabricated by a simple hydrothermal ion exchange method. The composition, morphology, and microstructure were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and N2 adsorption -desorption test. The results showed that the small solubility product of Bi2S3 is conducive to the in-situ conversion of Bi2MoO6 to Bi2S3, and the porous microsphere structure of Bi2MoO6 is conducive to ion transport, so it is easy to form multi-site heterojunctions. UV-Vis-NIR diffuse reflectance spectra indicates that the composite harvests a wide range of solar spectrum up to 1 800 nm. Photoluminescence, transient photocurrent response, and electrochemical impedance spectra confirm an accelerated charge generation and migration. The heterojunction overcame the low conduction band potential of bare Bi2MoO6 and the optimal photocatalytic H2 production rate reached 109.0 μmol·g-1·h-1 without using any noble metal cocatalyst. Based on DRS and Mott-Schottky measurements, it can be reasonably deduced that a Z-scheme heterojunction was constructed between Bi2MoO6 and Bi2S3. |
| Keywords: Bi2MoO6 Bi2S3 Z-scheme heterojunction multi-site hydrogen production photocatalyst |
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| ZHAO Yifan,MAO Qiyun,GUO Meijing,ZHANG Guoying,HU Tongliang.Z-scheme bismuth-based multi-site heterojunction: Synthesis and hydrogen production from photocatalytic hydrogen production[J].Chinese Journal of Inorganic Chemistry,2025,41(7):1318-1330. |
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