| Z型铋基多位点异质结的制备及其光催化制氢性能 |
| Z-scheme bismuth-based multi-site heterojunction: Synthesis and hydrogen production from photocatalytic hydrogen production |
| 作者 | 单位 | E-mail | | 赵依凡 | 天津师范大学化学学院, 天津市功能分子结构与性能重点实验室, 天津 300387
北京市通州区运河中学, 北京 101121 | | | 毛琦云 | 天津师范大学化学学院, 天津市功能分子结构与性能重点实验室, 天津 300387 | | | 郭美晶 | 天津师范大学化学学院, 天津市功能分子结构与性能重点实验室, 天津 300387 | | | 张国英 | 天津师范大学化学学院, 天津市功能分子结构与性能重点实验室, 天津 300387 | | | 胡同亮 | 南开大学材料科学与工程学院, 天津 300350 | tlhu@nankai.edu.cn |
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| 摘要: 通过简单的水热离子交换法成功地制备了一种具有优异光催化制氢性能的直接Z型3D Bi2MoO6/Bi2S3异质结。通过X射线衍射、扫描电子显微镜、透射电子显微镜和N2吸附-脱附测试对样品的组成、形貌和微观结构进行了系统的表征。研究结果表明，Bi2S3具有的较小溶度积有利于Bi2MoO6向Bi2S3的原位转化，且Bi2MoO6的多孔微球结构有利于离子传输，因此在水热离子交换过程中可形成多相异质结。紫外可见近红外漫反射光谱(DRS)检测表明，该复合材料可吸收波长在1 800 nm以内的太阳光。光致发光光谱、瞬态光电流响应和电化学阻抗测试结果均证实了电荷的生成和迁移的加速。异质结的构筑能克服Bi2MoO6产氢时导带电势较低的问题，该异质结在不使用任何贵金属作为共催化剂的情况下，达到了最佳的光催化产氢速率(109.0 μmol·g-1·h-1)。根据DRS和Mott-Schottky曲线测试结果推断Bi2MoO6和Bi2S3之间构建了Z型异质结。 |
| 关键词: Bi2MoO6 Bi2S3 Z型异质结 多位点 制氢 光催化 |
| 基金项目: 国家自然科学基金(No.22275102)和天津市硕士生创新工程项目(No.2020YJSS049)资助。 |
| 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 |
| 投稿时间：2025-01-01 修订日期：2025-05-26 |
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