Rationally tuning host–guest interactions to free hydroxide ions within intertrimerically cuprophilic metal–organic frameworks for high OH − conductivity

Hydroxide-anion-exchange membrane fuel cells (HEMFCs) are now considered as one of the most promising green energy-conversion technologies for stationary and mobile applications, showing high fuel conversion efficiency at high pH and low cost due to their ability to operate under basic conditions us...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (17), p.7816-7824
Main Authors: Li, Ziyin, Zhang, Zhangjing, Ye, Yingxiang, Cai, Kaicong, Du, Fenfen, Zeng, Heng, Tao, Jin, Lin, Quanjie, Zheng, Ying, Xiang, Shengchang
Format: Article
Language:English
Subjects:
Anions
Backbone
Basic converters
CATALYSTS
Cations
CONVERTERS
ELECTRICAL CONDUCTIVITY
FUEL CELLS
HYDROXIDES
Metal-organic frameworks
ORGANIC COMPOUNDS
OXIDES
Tuning
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Summary:Hydroxide-anion-exchange membrane fuel cells (HEMFCs) are now considered as one of the most promising green energy-conversion technologies for stationary and mobile applications, showing high fuel conversion efficiency at high pH and low cost due to their ability to operate under basic conditions using non-precious metal catalysts. But one key impediment to commercialization is insufficient hydroxide ion (OH-) conductivity of the central HEM component. Here, we report the development of free OH- anion-containing metal-organic frameworks (FOMOFs) with rationally tunable host-guest interactions for HEMs with high OH- conductivity. Among three solids obtained by post-synthesis treatment of ultrastable MOF FJU-66 with various bases, free OH- anions are observed in FJU-66.[EVIm]OH with strong host-guest interactions between the MOF backbone and guest cations. Despite the lowest OH- concentration, FJU-66.[EVIm]OH exhibits the highest OH- conductivity close to 0.1 S cm-1. The high OH- conductivity achieved suggests the potential application of the FOMOFs for practical HEMs of fuel cells.
ISSN:2050-7488
2050-7496
DOI:10.1039/c6ta11242k