光催化
表面光电压
带材弯曲
金属有机骨架
半导体
材料科学
制氢
载流子
纳米技术
带隙
催化作用
化学工程
氢
复合材料
光电子学
化学
物理化学
有机化学
物理
吸附
工程类
量子力学
光谱学
作者
Chenxi Zhang,Chenfan Xie,Yulong Gao,Xiaoping Tao,Chunmei Ding,Fengtao Fan,Hai‐Long Jiang
标识
DOI:10.1002/anie.202204108
摘要
Metal-organic frameworks (MOFs) have been intensively studied as a class of semiconductor-like materials in photocatalysis. However, band bending, which plays a crucial role in semiconductor photocatalysis, has not yet been demonstrated in MOF photocatalysts. Herein, a representative MOF, MIL-125-NH2 , is integrated with the metal oxides (MoO3 and V2 O5 ) that feature appropriate work functions and energy levels to afford the corresponding MOF composites. Surface photovoltage results demonstrate band bending in the MOF composites, which gives rise to the built-in electric field of MIL-125-NH2 , boosting the charge separation. As a result, the MOF composites present 56 and 42 times higher activities, respectively, compared to the pristine MOF for photocatalytic H2 production. Upon depositing Pt onto the MOF, ∼6 times higher activity is achieved. This work illustrates band bending of MOFs for the first time, supporting their semiconductor-like nature, which would greatly promote MOF photocatalysis.
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