期刊
INORGANIC CHEMISTRY
卷 59, 期 1, 页码 396-402出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.9b02649
关键词
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资金
- National Natural Science Foundation of China [21975065, 21501046, 21825106, 21671175]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [164100510005]
- Program for Innovative Research Team (in Science and Technology) in Universities of Henan Province [19IRTSTHN022]
Designing high-performance proton-conducting metal-organic frameworks simultaneously having highly hydrothermal stability and a high-density proton carrier remains a great challenge. Fe-MIL-88B is a classic metal-organic framework (MOF) with a large-size one-dimensional (1D) channel lined with a high-density uncoordinated metal atom for postfunctionalization; however this MOF cannot act as a proton conductor due to the weak hydrothermal stability. Here, we prepared an ultrastable isostructure Cr-MIL-88B, which is subsequently functionalized by anchoring 3-pyridinesulfonic acid and 2-(4-pyridyl) ethanesulfonic acid on the naked Cr atoms exposed on the surface of the host-framework, producing two new MOFs, i.e. Cr-MIL-88B-pyridine sulfonic acid (abbreviated as Cr-MIL-88B-PSA) and Cr-MIL-88B-pyridine ethanesulfonic acid (abbreviated as Cr-MIL-88B-PESA). Thus, Cr atoms on the host framework were modified by functional sulfonic groups, which stick out toward the center of the channel forming ordered high-density sulfonic groups as proton donors along the open channel and achieving the highest proton conductivity of 4.50 X 10(-2) S cm(-1) for Cr-MIL-88B-PESA and 1.58 x 10(-1) S cm(-1) for Cr-MIL-88B-PSA, surpassing that of the Nafion membrane.
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