Adjust the arrangement of imidazole on the metal-organic framework to obtain hybrid proton exchange membrane with long-term stable high proton conductivity
writer：Zhengguo Zhang, Jingmei Xu
keywords：Hybrid proton exchange membranes， Functionalized MOFs;
source：期刊
Issue time：2020年
Metal-organic frameworks-based hybrid proton exchange membranes could
combine the advantages of organic and inorganic materials with excellent chemical
and physical stability and good proton conductivity. In this work, two kinds of functionalized
MOFs were synthesized based on MOF-801. Imidazole@MOF-801 was prepared by the
impregnation method, which mainly incorporated free imidazole molecules into
the pores of the MOF-801. Imidazole-MOF-801 was obtained by in-situ method,
which imidazole further acted as non-structural ligands to coordinate to the
zirconium metal sites. Furthermore, the hybrid membranes were fabricated with
synthesized MOFs as fillers and sulfonated poly (arylene ether ketone sulfone) containing carboxyl groups (C-SPAEKS) as organic
matrix. The structures and morphologies of the prepared MOFs and hybrid
membranes were characterized by 1H NMR, XRD, FT-IR and SEM. The PXRD
results showed that Im@MOF-801 and Im-MOF-801 exhibited excellent stabilities
in both water and acid. The proton conductivities of these hybrid membranes
were much higher (0.023-0.066 S cm-1
at 30 oC, 0.050-0.128 S cm-1 at 90 oC) than
that of pure C-SPAEKS (0.010S cm-1 at 30 oC, 0.024 S cm-1
at 90 oC). Moreover, C-SPAEKS/Im-MOF-801-4% could maintain a stable
proton conductivity for more than 100 h. These results indicate that these
hybrid membranes have potential as proton exchange membranes.