期刊
SMALL
卷 17, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202100367
关键词
charge separation; heterojunction; metal organic framework; photoanode; water oxidation
类别
资金
- Beijing Natural Science Foundation [2182013]
- Natural Science Foundation of China [22076082]
- Capacity Building for Sci-Tech Innovation Fundamental Scientific Research Funds
Novel heterostructures were constructed by coating rutile TiO2 nanorods with metal organic framework (MOF) materials UiO-66 or UiO-67, resulting in enhanced charge separation efficiency and photocurrent density for photoelectrochemical water splitting.
Photoanode material with high efficiency and stability is extensively desirable in photoelectrochemical (PEC) water splitting for green/renewable energy source. Herein, novel heterostructures is constructed via coating rutile TiO2 nanorods with metal organic framework (MOF) materials UiO-66 or UiO-67 (UiO-66@TiO2 and UiO-67@TiO2), respectively. The pi electrons in the MOF linkers could increase the local electronegativity near the heterojunction interface due to the conjugation effect, thereby enhancing the internal electric field (IEF) at the heterojunction interface. The IEF could drive charge transfer following Z-scheme mechanism in the prepared heterostructures, inducing photogenerated charge separation efficiency increasing as 156% and 253% for the UiO-66@TiO2 and UiO-67@TiO2, respectively. Correspondingly, the UiO-66@TiO2 and UiO-67@TiO2 enhanced the photocurrent density as approximate two- and threefolds compared with that of pristine TiO2 for PEC water oxidation in universal pH electrolytes. This work demonstrates an effective method of regulating the IEF of heterojunction toward further improved charge separation.
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