Effect of Carbon Support Characteristics on Fuel Cell Durability in Accelerated Stress Testing
Effect of Carbon Support Characteristics on Fuel Cell Durability in Accelerated Stress Testing
复制标题
加速应力测试中碳载体特性对燃料电池耐久性的影响
DOI：
10.1149/1945-7111/abf265
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发表时间：
2021
影响因子：
3.9
通讯作者：
Jixin Chen
中科院分区：
文献类型：
--
作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen
支撑碳腐蚀被认为是影响燃料电池性能的主要降解机制。载体腐蚀加速应力测试（AST）在35℃和70℃下分别在1.0 V和1.5 V之间进行电位循环，以评估五种膜电极组件（MEAs）的耐久性，这些膜电极组件由供应商的催化剂涂层膜（CCMs）制成，含有不同的碳载体、催化剂负载和成分、离子/碳（I/C）比和离子当量重量（EWs）。通过全面的失效分析，研究了这些碳载体的碳腐蚀行为，重点研究了AST后的碳损失、固定电流密度下的电压退化、电化学表面积（ECSA）损失、催化剂层厚度减少、催化剂分散变化和电极孔隙率变化。尽管mea在这些表征中表现不同，但在70℃时，四种高表面积碳载体的累积碳损失率是相当相同的。这可能是由于碳在高温下的强烈直接氧化和只要碳可用的高电位窗口。石墨化碳在高温下比高表面积碳具有更好的支撑耐久性。然而，随着温度的降低，这种优势不再明显。在这项工作中建立了一个具有失效分析的碳腐蚀数据库，以支持材料和系统战略的发展。
Support carbon corrosion has been considered a major degradation mechanism impacting the fuel cell performance. A support corrosion accelerated stress test (AST) that consists of potential cycling between 1.0 V and 1.5 V at 35 C and 70 C, respectively has been performed at Ford to evaluate the durability of five membrane electrode assemblies (MEAs), which were made from suppliers' catalyst coated membranes (CCMs) containing different carbon supports, catalyst loadings and compositions, ionomer/carbon (I/C) ratios, and ionomer equivalent weights (EWs). The carbon corrosion behaviors from these carbon supports were studied focusing on the carbon loss, voltage degradation at a fixed current density, electrochemical surface area (ECSA) loss, catalyst layer thickness reduction, catalyst dispersion change, and electrode porosity change after AST, with the aid of comprehensive post-mortem failure analysis. Although the MEAs performed differently in these characterizations, the cumulative percentage carbon loss became quite the same for four high-surface-area carbon supports at 70 C. This is probably due to the strong direct oxidation of carbon at elevated temperature and high-potential window as long as carbon is available. Graphitized carbon presented outstanding support durability at high temperature than high-surface-area carbons. However, as temperature decreased, this advantage was no longer obvious. A database for carbon corrosion with failure analysis has been established in this work to support material and system strategy developments.
影响因子：
3.9
作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen;Chunchuan Xu
通讯作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen;Chunchuan Xu