Quaternized poly(vinyl alcohol)/alumina composite polymer membranes for alkaline direct methanol fuel cells

The quaternized poly(vinyl alcohol)/alumina (designated as QPVA/Al(2)O(3)) nanocomposite polymer membrane was prepared by a solution casting method. The characteristic properties of the QPVA/Al(2)O(3) nanocomposite polymer membranes were investigated using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), micro-Raman spectroscopy, and AC impedance method. Alkaline direct methanol fuel cell (ADMFC) comprised of the QPVA/Al(2)O(3) nanocomposite polymer membrane were assembled and examined. Experimental results indicate that the DMFC employing a cheap non-perfluorinated (QPVA/Al(2)O(3)) nanocomposite polymer membrane shows excellent electrochemical performances. The peak power densities of the DMFC with 4 M KOH + 1M CH(3)OH, 2 M CH(3)OH, and 4 M CH(3)OH solutions are 28.33, 32.40, and 36.15 mW cm(-2), respectively, at room temperature and in ambient air. The QPVA/Al(2)O(3) nanocomposite polymer membranes constitute a viable candidate for applications on alkaline DMFC. (C) 2009 Elsevier B.V. All rights reserved.