Polyoxometal molybdophosphoric acid (MoPA) bonded polyether
ether ketone (PEEK) composite membrane for water electrolysis has been
investigated. The composited membrane, covalently cross linked (CL) sulfonated
polyether ether ketone (SPEEK) with a bonded MoPA, was prepared in sulfonation
of PEEK, cross linkage reaction with 1,4-diiodobutane, and addition with
MoPA. PEEK was covalently cross-linked with 1,4-diiodobutane to improve mechanical
strength and was added with MoPA to increase proton conductivity.
MoPA should be fixed to back bone of SPEEK to prevent bleeding out. Therefore,
the carbonyl group of SPEEK was reduced with NaBH4 and 3-isocyanatepropyltriethoxysilane
(ICPTES) was added. The MoPA bonded composite was produced
in the reaction of MoPA with 3-mercaptopropyltrimethoxvsilane (MPTMS).
In conclusion, MoPA bonded CL-SPEEK composite membrane featured 0.129
S/cm of proton conductivity at 80℃, and 2,156 hours of chemical stability in
Fenton test. These properties are better than those of membranes of other