Anhydrous proton conduction at 150 °C in a crystalline metal-organic framework
- PMID:21124357
- DOI: 10.1038/nchem.402
Anhydrous proton conduction at 150 °C in a crystalline metal-organic framework
Abstract
Metal organic frameworks (MOFs) are particularly exciting materials that couple porosity, diversity and crystallinity. But although they have been investigated for a wide range of applications, MOF chemistry focuses almost exclusively on properties intrinsic to the empty frameworks; the use of guest molecules to control functions has been essentially unexamined. Here we report Na(3)(2,4,6-trihydroxy-1,3,5-benzenetrisulfonate) (named β-PCMOF2), a MOF that conducts protons in regular one-dimensional pores lined with sulfonate groups. Proton conduction in β-PCMOF2 was modulated by the controlled loading of 1H-1,2,4-triazole (Tz) guests within the pores and reached 5 × 10(-4) S cm(-1) at 150 °C in anhydrous H(2), as confirmed by electrical measurements in H(2) and D(2), and by solid-state NMR spectroscopy. To confirm its potential as a gas separator membrane, the partially loaded MOF (β-PCMOF2(Tz)(0.45)) was also incorporated into a H(2)/air membrane electrode assembly. The resulting membrane proved to be gas tight, and gave an open circuit voltage of 1.18 V at 100 °C.
Comment in
- Metal-organic frameworks: Transported into fuel cells.Kitagawa H.Kitagawa H.Nat Chem. 2009 Dec;1(9):689-90. doi: 10.1038/nchem.454.Nat Chem. 2009.PMID:21124353No abstract available.
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