| 内容提要: |
Zirconium glyphosate (ZrG) is a solid proton conductor with layered crystal structure. The inorganic
veneer sheets of ZrG are covalently intercalated by glyphosate molecules with carboxylic acid end groups
(–COOH). The existence of abundant –COOH groups both inside and on the surface of ZrG provides additional
proton-conducting channels facilitating the proton conduction through and around the inorganic
crystals. ZrG is incorporated into the sulfonated polyether ether ketone (SPEEK) matrices to prepare
proton-conducting hybrid membranes. The conductivity of the hybrid membranes is higher than the
pristine SPEEK membrane, and increases with increasing ZrG content. Furthermore, the enhancement of
the proton conductivity is more obvious at elevated temperatures. At 25 ◦C, the proton conductivity of
the hybrid membrane with 16 wt% ZrG is 1.4 times higher than that of the pristine membrane. When the
temperature increases to 55 ◦C, the conductivity of the hybrid membrane with 8 wt% ZrG is more than
twice that of the pristine SPEEK membrane. The prolonged and tortuous pathways originated from the
incorporation of inorganic crystals lead to reduced methanol permeability. The selectivity of the hybrid
membrane is increased by as much as 72% compared to the pristine SPEEK membrane. |