具有氧化铈自由基清除剂的双层膨胀聚四氟乙烯增强膜用于高稳定性质子交换膜燃料电池,ACS Applied Energy Materials

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具有氧化铈自由基清除剂的双层膨胀聚四氟乙烯增强膜用于高稳定性质子交换膜燃料电池
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-06-21 , DOI: 10.1021/acsaem.2c01263
Lei Liu _{1,

2} , Yijing Xing _{1,

2} , Yifan Li _{1,

2} , Zhiyong Fu _{1,

2} , Zhuoqun Li _{1,

2} , Haibin Li _{1,

2}

Affiliation

作为质子交换膜燃料电池（PEMFCs）的关键部件，质子交换膜（PEMs）的耐用性直接决定了PEMFCs的使用寿命。作为最先进的 PEM，全氟磺酸 (PFSA) 膜在实际工作条件下会遭受严重的机械和化学降解。考虑到这一点，我们提出了一种通过插入双层膨胀聚四氟乙烯 (ePTFE) 骨架和掺杂 CeO _{2来开发高度耐用 PEM 的策略。}自由基清除剂进入 PFSA 膜。结果表明，与单层 ePTFE 增强膜 (SR-Ms) 相比，双层 ePTFE 增强膜 (DR-Ms) 具有显着改善的机械性能、更低的膨胀率和出色的尺寸稳定性。在湿/干循环耐久性测试后，DR-Ms 与 SR-Ms 相比，显示出较低的氢交叉增加、降低的功率性能衰减和较小的膜阻抗增加。在开路电压（OCV）耐久性测试（ODT）之后，DR-Ms表现出更好的化学耐久性行为（如膜变薄和OCV衰减率）。此外，0.5 wt% CeO ₂与 DR-Ms 相比，掺杂的 DR-M (Ce-DR-M1) 在 ODT 期间进一步提高了化学耐久性。简而言之，开发的具有双层 ePTFE 骨架和 CeO ₂自由基清除剂的 Ce-DR-M1 是用于 PEMFC 应用的具有高机械和化学耐久性的先进 PEM 的有希望的候选者。

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Double-Layer Expanded Polytetrafluoroethylene Reinforced Membranes with Cerium Oxide Radical Scavengers for Highly Stable Proton Exchange Membrane Fuel Cells

As a key component of proton exchange membrane fuel cells (PEMFCs), the durability of the proton exchange membranes (PEMs) directly determines the service life of the PEMFCs. As state-of-the-art PEMs, perfluorosulfonic acid (PFSA) membranes suffer from critical mechanical and chemical degradation under actual working conditions. Considering this, we present a strategy to develop highly durable PEMs by intercalating double-layer expanded polytetrafluoroethylene (ePTFE) skeletons and doping CeO₂ radical scavengers into the PFSA membranes. The results reveal that the double-layer ePTFE reinforced membranes (DR-Ms) have significantly improved mechanical properties, lower swelling rates, and superior dimensional stability compared to single-layer ePTFE reinforced membranes (SR-Ms). After the wet/dry cycle durability test, DR-Ms show a lower hydrogen crossover increase, reduced power performance attenuation, and smaller membrane impedance increase than SR-Ms. After the open-circuit voltage (OCV) durability test (ODT), DR-Ms exhibit better chemical durability behaviors (such as membrane thinning and OCV decay rates). Furthermore, the 0.5 wt % CeO₂-doped DR-M (Ce-DR-M1) imparts a further improved chemical durability during the ODT compared with DR-Ms. In short, the developed Ce-DR-M1 with double-layer ePTFE skeletons and CeO₂ radical scavengers is a promising candidate for advanced PEMs with high mechanical and chemical durability for PEMFC applications.

更新日期：2022-06-21

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