Fabrication of TiO 2 /MOF Type II Heterojunction by Growth of TiO 2 on Cr-Based MOF for Enhanced Photocatalytic Hydrogen Production

作者：Xiaoxiao Li, Xinya Feng, Delong Meng, Xiaojing Hu, Lan Li, Yiming Zhang, Xusheng Wang · 发表于：Crystal Growth & Design · 年份：2025 · DOI：10.1021/acs.cgd.4c01530 · 被引用次数：32 · 研究领域：Advanced Photocatalysis Techniques、Catalytic Processes in Materials Science、Metal-Organic Frameworks: Synthesis and Applications

MOF-based heterojunctions can significantly enhance the efficiency of photocatalytic hydrogen production; however, the construction of efficient MOF-based heterojunctions remains a formidable challenge. In this study, we successfully developed a series of Type II MOF-based heterojunctions by growing TiO 2 on Cr-based MOF, thereby regulating the generation, separation, and transportation of photogenerated charge carriers to improve photocatalytic hydrogen evolution performance. Among these, the 23%TiO 2 /MIL-101(Cr) photocatalyst exhibited the highest photocatalytic hydrogen production activity, achieving 884.01 μmol g –1 in just 5 h, which is 6.8 and 6.0 times that of pure MIL-101(Cr) and TiO 2, respectively. Additionally, the 23%TiO 2 /MIL-101(Cr) photocatalyst demonstrated excellent cyclic stability. Tiny TiO 2 particles were proven mainly deposited on the MIL-101(Cr) surface by N 2 sorption isotherm analyses, transmission electron microscopy (TEM), high-resolution TEM, high-angle annular dark field scanning transmission electron microscopy, etc. Characterization techniques such as in situ XPS confirmed the formation of the TiO 2 /MIL-101(Cr) Type II heterostructure. Band structure analysis indicates that the 23%TiO 2 /MIL-101(Cr) meets the thermodynamic requirements for photocatalytic hydrogen production. Furthermore, transient photocurrent measurements, electrochemical impedance analysis, and photoluminescence reveal that the 23%TiO 2 /MIL-101(Cr) possesses superior capab...