posted on 2024-03-07, 13:09authored byHuan Wu, Junchao Jia, Xiao-Min Li, Aziz Bakhtiyarovich Ibragimov, Haotian Gao, Junkuo Gao
The processability and sustainability of proton conductors
are
two important indicators of their application. Here, MIL-91(Al) with
an intrinsic proton conduction framework originating from protonated
phosphonate groups was cross-linked with poly(vinyl alcohol) (PVA)
to obtain MIL-91(Al) aerogel through freeze-drying. This simple and
inexpensive strategy not only facilitated the processing of MIL-91(Al)
powder but also resulted in a molded MIL-91(Al) aerogel having a high
proton conductivity of 1.02 × 10–2 S cm–1 at 70 °C and 100% relative humidity. Furthermore,
MIL-91(Al) aerogel was recyclable and reusable, in line with the principles
of environmental protection and sustainability. To the best of our
knowledge, this is the first example of using a metal–organic
framework aerogel as a proton conductor, which may develop a new model
system in this field.