Preparation and Properties of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Composites for Solid Alkaline Electrolyte Membranes

IF 13.5 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2010-01-01 DOI:10.3866/PKU.WHXB20100918

Fu Jing, 上海华东理工大学资源与环境工程学院, Lin Rui, LüHong, Wan Xiao-lei, Ma Jian-xin, Qiao Jinli, 上海同济大学新能源汽车工程中心

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引用次数: 3

Abstract

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 when a 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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固体碱性电解质膜用聚乙烯醇/聚乙烯基吡咯烷酮复合材料的制备及性能研究

以聚乙烯醇/聚乙烯基吡咯烷酮(PVA/PVP)为原料，通过KOH掺杂制备了固体碱性电解质膜。研究了复合膜的组成、微观结构、热稳定性、离子电导率和甲醇吸收率。当质量比为m(PVA)∶m(PVP)=1∶0.5时，可制得完全透明、均匀致密的PVA/PVP/KOH复合膜，且无明显的相分离现象。随着PVP含量的增加，PVA/PVP膜的离子电导率和热稳定性显著提高。当质量比为m(PVA)∶m(PVP)=1∶1时，离子电导率可达2.01×10-3 S.cm-1。此外，PVA/PVP/KOH膜在高温条件下的甲醇吸收量几乎没有变化，比100℃条件下的Nafion 115膜的甲醇吸收量低4倍。因此，这些膜是很有前途的固体碱性电解质膜，可用于高温下的碱性直接甲醇燃料电池。

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