Citation:
FU Jing, LIN Rui, LV Hong, WANG Xiao-Lei, MA Jian-Xin, QIAO Jin-Li. Preparation and Properties of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Composites for Solid Alkaline Electrolyte Membranes[J]. Acta Physico-Chimica Sinica,
;2010, 26(10): 2653-2658.
doi:
10.3866/PKU.WHXB20100918
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Solid alkaline electrolyte membranes were prepared using poly(vinyl alcohol)/poly(vinyl pyrrolidone) (PVA/PVP) by KOH doping. The composition, microstructure, thermal stability, ionic conducitvity and methanol uptake of the composite membranes were investigated in detail. The wholly transparent, homogeneous and compact PVA/PVP/KOH composite membranes were obtained when m(PVA) :m(PVP)=1 :0.5 in a mass ratio and no obvious phase seperation was observed. The ionic conductivity and thermal stability of the PVA/PVP membranes increased greatly with increasing the content of PVP. A high ionic conductivity of 2.01 ×10-3 S·cm-1 was obtained whena mass ratio of m(PVA) :m(PVP)=1 :1 was used. In additon, the methanol uptake of the PVA/PVP/KOH membranes showed almost no change after conditioning at elevated temperatures and it was 4 times lower than that of the Nafion 115 membrane after conditioning at 100 ℃. These membranes are, therefore, promising solid alkaline electrolyte membranes for use in alkaline direct methanol fuel cells at elevated operating temperature.
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