Journal
CHEMICAL SCIENCE
Volume 4, Issue 3, Pages 983-992Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sc21927a
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Funding
- National Basic Research Program of China (973 Program) [2012CB821700]
- Major International (Regional) Joint Research Project of NSFC [21120102034]
- National Natural Science Foundation of China [20831002, 20502024]
- China Postdoctoral Science Foundation [20100481049]
- priming scientific research foundation for doctors of Xi'an Polytechnic University [BS1115]
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A chiral two-dimensional MOF, {[Ca(D-Hpmpc)(H2O)(2)]center dot 2HO(0.5)}(n) (1, D-H(3)pmpc D-1-(phosphonomethyl) piperidine-3-carboxylic acid), with intrinsic proton conductivity has been synthesized and characterized. Structure analysis shows that compound 1 possesses protonated tertiary amines as proton carriers and hydrogen-bonding chains served as proton-conducting pathways. Further, MOF-polymer composite membranes have been fabricated via assembling polymer PVP with different contents of rod-like 1 submicrometer crystals. Interestingly, the proton conductivity of this composite membrane containing 50 wt% 1 is rapidly increased, compared with that of pure submicrometer crystals at 298 K and similar to 53% RH. Therefore, it is feasible to introduce humidification of PVP into composite membranes to enhance low-humidity proton conductivity; and humidified PVP with adsorbed water molecules plays an important role in proton conduction indicated by the results of water physical sorption and TG/DTG analyses. This study may offer a facile strategy to prepare a variety of solid electrolyte materials with distinctive proton-conducting properties under a low humidity.
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