Anhydrous proton conduction at 150 °C in a crystalline metal-organic framework.
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.
Department of Chemistry, University of Calgary, Calgary, Alberta, T2N 1N4, Canada.
Jeff A
JA
Hurd
Ramanathan
R
Vaidhyanathan
Venkataraman
V
Thangadurai
Christopher I
CI
Ratcliffe
Igor L
IL
Moudrakovski
George K H
GK
Shimizu
D001557:Benzenesulfonates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003903:Deuterium / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D006358:Hot Temperature; D006859:Hydrogen / Q000737:chemistry; D008567:Membranes, Artificial; D009942:Organometallic Compounds / Q000737:chemistry*; D016062:Porosity; D011522:Protons
D001557:Benzenesulfonates; D004573:Electrolytes; D008567:Membranes, Artificial; D009942:Organometallic Compounds; D011522:Protons; D006859:Hydrogen; D003903:Deuterium