Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1288930 | Journal of Power Sources | 2011 | 8 Pages |
A series of novel hybrid membranes based on sulfonated poly(arylene ether ketone)s (SNPAEKs), polysiloxane (KH-560) and sulfonated curing agent (BDSA) has been prepared by sol–gel and cross-linking reaction for direct methanol fuel cells (DMFCs). All the hybrid membranes (SKB-xx) show high thermal properties and improved oxidative stability compared with the pristine SNPAEK membrane. The sulfonated cross-linked polysiloxanes networks in the hybrid membranes enhance the mechanical properties and reduce the swelling ratio. The swelling ratio of SKB-20 is 22%, which is much lower than that of the pristine SNPAEK (37%) at 80 °C. Meanwhile, SKB-xx membranes with greatly reduced methanol permeabilities show comparative proton conductivities to pristine SNPAEK membranes. Notably, the proton conductivities of SKB-5 and SKB-10 reach to 0.192 S cm−1 and 0.179 S cm−1 at 80 °C, respectively, which are even higher than the 0.175 S cm−1 of SNPAEK.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel hybrid membrane is prepared for DMFC. ► Side-chain-type SNPAEK acts as matrix. ► KH-560 forms polysiloxane cross-linked structure. ► BDSA acts as both curing agent and proton conductor.