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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Degradation mechanism of polystyrene sulfonic acid membrane and application of its composite membranes in fuel cells
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Degradation mechanism of polystyrene sulfonic acid membrane and application of its composite membranes in fuel cells

机译：聚苯乙烯磺酸膜的降解机理及其复合膜在燃料电池中的应用

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摘要

The lifetime behavior of a H-2/O-2 proton exchange membrane (PEM) fuel cell with polystyrene sulfonic acid (PSSA) membrane have been investigated in order to give an insight into the degradation mechanism of the PSSA membrane. The distribution of sulfur concentration in the cross section of the PSSA membrane was measured by energy dispersive analysis of X-ray, and the chemical composition of the PSSA membrane was characterized by infrared spectroscopy before and after the lifetime experiment. The degradation mechanism of the PSSA membrane is postulated as: the oxygen reduction at the cathode proceeds through some peroxide intermediates during the fuel cell operation, and these intermediates have strong oxidative ability and may chemically attack the tertiary hydrogen at the a carbon of the PSSA; the degradation of the PSSA membrane mainly takes place at the cathode side of the cell, and the loss of the aromatic rings and the SO3- groups simultaneously occurs from the PSSA membrane. A new kind of the PSSA-Nafion composite membrane, where the Nafion membrane is bonded with the PSSA membrane and located at the cathode of the cell, was designed to prevent oxidation degradation of the PSSA membrane in fuel cells. The performances of fuel cells with PSSA-Nafion101 and PSSA-recast Nafion composite membranes are demonstrated to be stable after 835 h and 240 h, respectively. [References: 35]
机译：为了研究PSSA膜的降解机理，研究了带有聚苯乙烯磺酸（PSSA）膜的H-2 / O-2质子交换膜（PEM）燃料电池的使用寿命。通过X射线的能量色散分析来测量PSSA膜的横截面中硫浓度的分布，并且在寿命试验之前和之后通过红外光谱来表征PSSA膜的化学组成。假设PSSA膜的降解机理为：在燃料电池运行过程中，阴极上的氧还原通过一些过氧化物中间体进行，这些中间体具有很强的氧化能力，并可能化学侵蚀PSSA碳原子上的叔氢; PSSA膜的降解主要发生在电池的阴极侧，而芳香环和SO3-的损失同时发生在PSSA膜上。一种新型的PSSA-Nafion复合膜，其中Nafion膜与PSSA膜结合并位于电池的阴极，旨在防止燃料电池中PSSA膜的氧化降解。带有PSSA-Nafion101和PSSA重铸的Nafion复合膜的燃料电池的性能分别证明在835小时和240小时后是稳定的。 [参考：35]

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