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
聚乙烯醇/聚乙烯吡咯烷酮碱性复合膜的制备及其性能
通过在不同浓度KOH 溶液中进行掺杂, 制备出了聚乙烯醇/聚乙烯吡咯烷酮(PVA/PVP) 碱性聚合物电解质膜. 详尽考察了膜的组成、微观结构、热稳定性、离子电导率和甲醇吸收率. 结果表明, PVA 与PVP 两者具有较好的相容性, 当m(PVA) :m(PVP)=1 :0.5 时, 膜断面致密、均匀, 未发生大尺度相分离. PVP 的混入可以极大提高复合膜的电导率和热稳定性. 当m(PVA) :m(PVP)=1 :1 时, 复合膜的电导率可达2.01 ×10-3 S·cm-1. PVA/PVP/KOH 膜的甲醇吸收率随温度的升高没有明显变化, 100 ℃时其甲醇吸收率仅为同条件下Nafion 115 膜的1/4. 这表明该复合膜有望作为一种新型的碱性直接甲醇燃料电池用固体电解质膜且可提高膜的使用温度.
English
Preparation and Properties of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Composites for Solid Alkaline Electrolyte Membranes
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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