Studies on proton conductivity of polyimide/H3PO4/imidazole blends
Studies on proton conductivity of polyimide/H3PO4/imidazole blends
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DOI：
10.1016/j.electacta.2006.02.035
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发表时间：
2006-08
影响因子：
6.6
通讯作者：
H. Pu;Dan Wang
中科院分区：
文献类型：
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作者：
H. Pu;Dan Wang
以聚酰亚胺(PI)/H3PO4/咪唑（Imi）共混物为基材，制备了一种新型无水质子导电材料。红外光谱显示质子化和未质子化的咪唑单位之间存在氢键。磷酸的加入可以加速PI的降解过程，而咪唑的加入可以极大地提高PI/ h3po4共混物的化学氧化稳定性。随着咪唑含量的增加，PI/ h3po4共混物的质子电导率显著提高。PI/xH3PO4/yImi膜的质子电导率随温度和磷酸含量的增加而增加。实验结果表明，用咪唑代替水作为聚合物膜中的质子溶剂，可以显著提高PEM燃料电池系统的工作温度。氢键似乎在该体系的质子电导率中起着重要作用。磷酸咪唑质子电导率的下降在一定程度上说明咪唑与磷酸的相互作用并不是咪唑掺杂PI/ h3po4体系电导率增加的主要原因。
A new anhydrous proton conducting material based on polyimide(PI)/H3PO4/imidazole(Imi) Blends was prepared. FTIR spectrum shows the existence of hydrogen bonds between protonated and unprotonated imidazole units. The addition of phosphoric acid can accelerate the degradation process of PIs, while the addition of imidazole in PI/H3PO4blends can improve their chemical oxidation stability enormously. The proton conductivity of PI/H3PO4blends increases significantly with increasing content of imidazole. Proton conductivity of PI/xH3PO4/yImi membranes increases with increasing temperature and content of phosphoric acid. The experimental results show that it is possible to significantly improve the operating temperature of PEM fuel cell system by replacing water with imidazole as proton solvent in the polymer membrane. Hydrogen bond seems to play an important role in the proton conductivity of this system. The decrease of proton conductivity of imidazolium phosphate shows in some degree that the interaction between imidazole and phosphoric acid is not the main reason for the conductivity increment of imidazole doped PI/H3PO4system.