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Degradation characteristics of membrane electrode assembly under drive cycle test protocol

机译：驱动循环试验规程下膜电极组件的降解特性

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One of the key factors determining the lifetime of proton exchange membrane fuel cell (PEMFC) is the degradation and eventually the failure of membrane electrode assembly (MEA). To assess the long-term durability of MEA in fuel cells for vehicular applicatoin, this study adopted the accelerating technique using drive cycle test protocol developed by Chinese NERC Fuel Cell & Hydrogen Technology. The protocol includes starts/stops, idling, and acceleration, simulating major degradation processes in real automobile application. After 900 h of accelerated test, MEA's performance declined from the initial 0.65 V to 0.58 V@500 mA cm(-2), dropping by more than 10% and giving an average voltage decay rate of 70 mu V h(-1). To examine the underlying mechanisms for the degradation, post-mortem analyses such as X-ray photoelectric spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive X-Ray spectroscopy (EDX) were carried out for the MEA before and after 900 h drive cycle test. The post-mortem analyses indicate that the thinning of the electrolyte membrane at H-2 outlet region is the decisive factor leading to the end-of-life of PEMFC, and the Pt catalysts loss and microstructural damage of MEA are the decisive factors for the performance degradation and stability deterioration of PEMFC.
机译：决定质子交换膜燃料电池（PEMFC）寿命的关键因素之一是膜电极组件（MEA）的退化以及最终的失败。为了评估MEA在车用燃料电池中的长期耐用性，本研究采用了由中国NERC燃料电池和氢技术开发的基于驾驶循环测试协议的加速技术。该协议包括启动/停止，空转和加速，以模拟实际汽车应用中的主要退化过程。经过900 h的加速测试后，MEA的性能从最初的0.65 V降至500mA cm（-2）的0.58 V，下降了10％以上，平均电压衰减率为70μV h（-1）。为了检查降解的潜在机理，在900年前后对MEA进行了验尸分析，例如X射线光电光谱（XPS），扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）。 h行驶周期测试。事后分析表明，H-2出口区域的电解质膜变薄是导致PEMFC寿命终止的决定性因素，而MEA的Pt催化剂损失和微结构破坏是导致MEA的决定性因素。 PEMFC的性能下降和稳定性下降。

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