Anhydrous proton conduction at 150 degrees C in a crystalline metal-organic framework

作者：Hurd Jeff A; Vaidhyanathan Ramanathan; Thangadurai Venkataraman; Ratcliffe Christopher I; Moudrakovski Igor L; Shimizu George K H^*

来源：Nature Chemistry, 2009, 1(9): 705-710.

DOI：10.1038/NCHEM.402

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 beta-PCMOF2), a MOF that conducts protons in regular one-dimensional pores lined with sulfonate groups. Proton conduction in beta-PCMOF2 was modulated by the controlled loading of 1H-1,2,4-triazole (Tz) guests within the pores and reached 5x10(-4) S cm(-1) at 150 degrees 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 (beta-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 degrees C.

• 出版日期2009-12