| 直接Z型LaNiO3/Mn0.2Cd0.8S异质结催化剂光解水产氢性能及机理探究 | |
| Direct Z-Scheme LaNiO 3/Mn0.2Cd0.8S Heterojunction Photocatalysts: Enhanced Photocatalytic Performance for H2 Evolution and Investigation of Mechanism | |
| 摘要: 以LaNiO3纳米颗粒为基质，在水热法制备CdS的过程中引入Mn2+离子，原位合成直接Z型LaNiO3/Mn0.2Cd0.8S异质结光催化剂。分别采用场发射扫描电镜、X射线衍射、X射线光电子能谱、紫外可见漫反射光谱、氮气吸附-脱附测试以及电化学测试等分析方法对制备的催化剂进行表征。在光解水产氢测试中，LaNiO3/Mn0.2Cd0.8S异质结光催化剂在5 h的H2产量达到1 190.3μmol，相较于CdS和Mn0.2Cd0.8S，其H2产量分别提高了25倍和10倍。荧光和电化学实验证实，Mn2+的引入能够有效地促进光生载流子的分离，同时LaNiO3/Mn0.2Cd0.8S之间异质结的构筑能有效地促进光生载流子在界面间的迁移、分离，从而促进其光解水产氢效率和稳定性的提高。结合一系列表征和活性测试结果提出直接Z型光解水反应机理，很好地阐述了其光解水产氢活性和稳定性的增强。 | |
| 关键词: 直接Z型异质结 LaNiO3/Mn0.2Cd0.8S 光解水产氢 光腐蚀 稳定性 | |
| 基金项目: 福建省自然科学基金青创项目（No.2020J05244）和福建省中青年教育科研项目（No.JAT190482）资助。 | |
| Abstract: Direct Z-scheme LaNiO3/Mn0.2Cd0.8S heterojunction photocatalysts were synthesized in situ by the introduction of Mn2+ ions in the hydrothermal preparation of CdS using LaNiO3 nanoparticles matrix and fully characterized by field emission scanning electron microscope, powder X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra, N2 adsorption-desorption test and electrochemistry test. LaNiO3/Mn0.2Cd0.8S heterojunction photocatalysts showed improved photocatalytic H2 evolution and stability. The photocatalytic H2 evolution over LaNiO3/Mn0.2Cd0.8S heterojunction photocatalysts reached to 1 190.3 μmol in 5 h, which was 25-fold and 10-fold enhanced compared with pure CdS and Mn0.2Cd0.8S. The enhanced performance of LaNiO3/Mn0.2Cd0.8S heterojunction photocatalysts was ascribed to the formation of heterojunction between LaNiO3 and Mn0.2Cd0.8S as well as the introduced Mn2+ ion, which both can inhibit the recombination of the photoinduced electron-hole. Based on the above results, the direct Z-scheme photocatalytic reaction mechanism was proposed to elucidate the improved performance of LaNiO3/Mn0.2Cd0.8S heterojunction photocatalysts. | |
| Keywords: direct Z-scheme heterojunction LaNiO3/Mn0.2Cd0.8S photocatalytic H2 evolution photocorrosion stability | |
| 投稿时间：2021-05-11 修订日期：2021-08-06 | |
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| 王兆宇,许俊丽,张明文,陈文韬.直接Z型LaNiO3/Mn0.2Cd0.8S异质结催化剂光解水产氢性能及机理探究[J].无机化学学报,2021,37(10):1809-1818. | |
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