TY - JOUR
T1 - Anhydrous proton conduction at 150 °c in a crystalline metal-organic framework
AU - Hurd, Jeff A.
AU - Vaidhyanathan, Ramanathan
AU - Thangadurai, Venkataraman
AU - Ratcliffe, Christopher I.
AU - Moudrakovski, Igor L.
AU - Shimizu, George K.H.
PY - 2009/12
Y1 - 2009/12
N2 - 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 ß 2-PCMOF2), a MOF that conducts protons in regular one-dimensional pores lined with sulfonate groups. Proton conduction in ß 2-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-1at 150 °C in anhydrous H2 as confirmed by electrical measurements in H2 and D2, and by solid-state NMR spectroscopy. To confirm its potential as a gas separator membrane, the partially loaded MOF (ß-PCMOF2(Tz) 0.45) was also incorporated into a H2 /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.
AB - 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 ß 2-PCMOF2), a MOF that conducts protons in regular one-dimensional pores lined with sulfonate groups. Proton conduction in ß 2-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-1at 150 °C in anhydrous H2 as confirmed by electrical measurements in H2 and D2, and by solid-state NMR spectroscopy. To confirm its potential as a gas separator membrane, the partially loaded MOF (ß-PCMOF2(Tz) 0.45) was also incorporated into a H2 /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.
U2 - 10.1038/nchem.402
DO - 10.1038/nchem.402
M3 - Article
C2 - 21124357
AN - SCOPUS:70749089003
SN - 1755-4330
VL - 1
SP - 705
EP - 710
JO - Nature Chemistry
JF - Nature Chemistry
IS - 9
ER -