In this work, seven commercially available high temperature (HT) membrane electrode assemblies (MEAs), using a phosphoric acid doped polybenzimidazole (PBI) membrane, were tested at six constant current densities during mostly around 540 h: 1, 0.6, 0.4, 0.2, 0.1, and 0 A cm⁻². The MEA aged at 0.6 A cm⁻² appears to be the less degraded one and the MEAs working at 0 and 1 A cm⁻² seem to be the most degrading ones. Degradations are supposed to be mainly due to the carbon corrosion of electrodes and the loss of electrolyte with the MEA aged at 1 A cm⁻². The characterization periods have a significant impact on cell ageing. The corrosion of carbon support is considered here to be the major degradation for the tests carried out between 0 and 0.6 A cm⁻². A degradation rate was calculated using the voltage from the polarization curves and it appears to be more relevant compare to the degradation rate calculated using the voltage during endurance period. The modeling approach shows promising results and it seems that the electrochemical surface area, measured by cyclic voltammetry, can be included into the modeling in order to obtain higher parameter consistency.

中文翻译：

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恒定电流下的老化测试和高温PEMFC MEA的相关建模

在这项工作中，使用磷酸掺杂的聚苯并咪唑（PBI）膜对七个市售的高温（HT）膜电极组件（MEA）进行了测试，在大约540小时的六个恒定电流密度下：1、0.6、0.4、0.2 ，0.1和0 A cm ^-2。在0.6 A cm ^-2下老化的MEA似乎退化程度较小，而在0和1 A cm ^-2下工作的MEA降解最差。退化主要是由于电极的碳腐蚀和MEA在1 A cm ^-2老化时电解质的损失。表征期对细胞老化具有重大影响。在0至0.6A cm ^-2之间进行的测试中，碳载体的腐蚀在这里被认为是主要的劣化。使用极化曲线上的电压计算出退化率，与在耐久期内使用电压计算出的退化率相比，它似乎更为相关。该建模方法显示出令人鼓舞的结果，并且似乎可以将通过循环伏安法测量的电化学表面积包括在建模中，以获得更高的参数一致性。