Highly efficient solar steam generation of supported metal-organic framework membranes by a photoinduced electron transfer process
Highly efficient solar steam generation of supported metal-organic framework membranes by a photoinduced electron transfer process
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通过光诱导电子转移过程高效产生支撑金属有机骨架膜的太阳能蒸汽
DOI：
10.1039/c8nr09080g
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发表时间：
2019-06-21
期刊：
影响因子：
6.7
通讯作者：
Duan, Chunying
中科院分区：
文献类型：
--
作者：
Chen, Liyong;Li, Dezhi;Duan, Chunying
基于卟啉的分子具有优异的光物理性质，在光热领域有着广泛的应用。然而，这些分子具有较小的光吸收截面和较高的辐射复合速率，导致光热转换性能较差。本文利用由四(4-羧基苯基)卟啉(TCPP)和Co2+组成的卟啉桨轮骨架-3(PPF-3)研究了光致电子转移(PET)过程中增强光热效应的可能性。最后，支撑的PPF-3膜表现出与金纳米颗粒支撑膜相当的太阳能蒸汽产生性能。PPF-3支撑膜的太阳能接收效率提高到70.3%，与TCPP支撑膜相比提高了420%。性能的提高得益于PPF-3的结构和成分，这些结构和成分能够扩大光吸收范围，并抑制PET从TCPP的最低空分子轨道(LUMO)到钴离子的激子辐射复合。基于金属有机骨架的普遍结构，该研究为金属有机骨架作为低成本和合格的光热材料的应用开辟了一条新的途径。
Porphyrin-based molecules possess excellent photophysical properties and are widely applied in photothermal fields. Nonetheless, these molecules featuring small cross sections of optical absorption and high radiative recombination rates lead to inferior performance of photothermal conversion. Herein, porphyrin paddle-wheel framework-3 (PPF-3) composed of tetrakis (4-carboxyphenyl) porphyrin (TCPP) and Co2+ was utilized to study the possibility of the enhanced photothermal effect induced by a photoinduced electron transfer (PET) process. Finally, the supported PPF-3 membrane exhibited comparable solar steam generation performance to a supported membrane of Au nanoparticles. The solar thermal receiver efficiency of the supported PPF-3 membrane was increased to 70.3% which was similar to 420% higher than that of the supported TCPP membrane. The enhanced performance benefits from the PPF-3 structure and components that enable the broadening of the optical absorption range and suppress the radiative recombination of excitons by PET from the lowest unoccupied molecular orbital (LUMO) of TCPP to cobalt ions. Based on the ubiquitous structures of metal-organic frameworks (MOFs), the research opens a new avenue for the applications of MOFs as cost-efficient and eligible photothermal materials.