The impact of different parameters on the chemical degradation of the Nafion polymer electrolyte membrane was investigated in detail under different concentrations of Fenton solution. As a consequence of chemical degradation, the performance and durability of the perfluorosulfonic acid-based electrolyte membrane in fuel cells was studied. Quantitative estimation of fluoride emitted after chemical degradation of the electrolyte membrane is done by an ex-situ fluoride emission rate-test using a potentiometric with an ion-selective electrode. The concentration of fluoride ions is easily affected by several external factors, such as total ionic strength, pH, temperature, and stirring speed, which causes many errors while reporting the fluoride concentration. Furthermore, the micromorphology of recast Nafion membranes before and after FER rest was thoroughly examined by scanning electron microscope (SEM) and X-ray photoelectric spectroscopy. Here, we report the influence of several external parameters over total fluoride concentration during the estimation of fluoride concentration for the proper correlation of the rate of chemical degradation in polymer electrolytes. This systematic study is beneficial for removing errors while measuring fluoride concentration and removing the discrepancy present in FER results reported in the literature.

详细研究了不同浓度Fenton溶液下不同参数对Nafion聚合物电解质膜化学降解的影响。作为化学降解的结果，研究了燃料电池中全氟磺酸基电解质膜的性能和耐久性。电解质膜化学降解后排放的氟化物的定量估计是通过使用带有离子选择电极的电位计的异位氟化物排放率测试来完成的。氟离子浓度容易受到总离子强度、pH值、温度、搅拌速度等多种外部因素的影响，导致氟离子浓度报告误差较大。此外，通过扫描电子显微镜 (SEM) 和 X 射线光电光谱法彻底检查了 FER 休息前后重铸 Nafion 膜的微形态。在这里，我们报告了在估计氟化物浓度期间几个外部参数对总氟化物浓度的影响，以正确关联聚合物电解质中的化学降解速率。这项系统研究有助于消除测量氟化物浓度时的误差，并消除文献报道的 FER 结果中存在的差异。我们报告了在估计氟化物浓度期间几个外部参数对总氟化物浓度的影响，以正确关联聚合物电解质中的化学降解速率。这项系统研究有助于消除测量氟化物浓度时的误差，并消除文献报道的 FER 结果中存在的差异。我们报告了在估计氟化物浓度期间几个外部参数对总氟化物浓度的影响，以正确关联聚合物电解质中的化学降解速率。这项系统研究有助于消除测量氟化物浓度时的误差，并消除文献报道的 FER 结果中存在的差异。