Journal of Electroanalytical Chemistry, Vol.759, 174-183, 2015
Alkaline hybrid composite membrane for direct methanol fuel cells application
A series of organic-inorganic alkaline hybrid membranes were prepared based on crosslinked quaternized chitosan (QCS, the quatemization degree (DQ) was 63.5(+/- 2.5)%) with different contents of tetrabutyl titanate (TBT) for alkaline direct methanol fuel cells (ADMFCs). The result revealed that the obtained anion exchange membranes (AEMs) were stable up to 150.0 degrees C in the air atmosphere according to the TGA analysis and anionic conductivities of the hybrid membranes at a level of 10(-2) S cm(-1) were obtained at 70.0 degrees C. A tensile stress at a break of 41.19 MPa. at room temperature was achieved for QCS-TBT20% membrane. The anionic conductivity of QCS-TBTx% (15 <= X <= 25) membrane in 1.0 mol L-1 KOH solution was stable for more than 60.0 h. Corresponding to the increase in the content of TBT from 0 wt.% to 25 wt.% in the hybrid membrane, the methanol permeability was decreased from 7.55 x 10(-6) cm(-2) s(-1) to 1.85 x 10(-6) cm(2) s(-1). The water swelling of QCS-TBTx% (X <= 30) membranes was discussed based on the stress relaxation model of polymer chains, and it obeyed the Schott's second-order swelling kinetics. (C) 2015 Elsevier B.V. All rights reserved.