You Sang-Hoon, Jung Sang-Mun, Park Jinheon, Kim Jaerim, Kim Jong Kyu, Son Junwoo, Kim Yong-Tae
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Sci Adv. 2023 Sep 29;9(39):eadi5696. doi: 10.1126/sciadv.adi5696. Epub 2023 Sep 27.
The poor durability, attributed to catalyst corrosion during start-up/shutdown (SU/SD), is a major obstacle to the commercialization of fuel cell electric vehicles (FCEVs). We recently achieved durability enhancement under SU/SD conditions by implementing a metal-insulator transition (MIT) using proton intercalation/deintercalation in WO. However, such oxide-supported catalysts were unsuitable for direct application to the mass production stage of membrane electrode assembly (MEA) process due to their physical and chemical properties. Here, we report a unique approach that achieves the same durability enhancement in SU/SD situations while being directly applicable to the conventional MEA fabrication process. We coated WO on the bipolar plate, gas diffusion layer, and MEA to investigate whether the MIT phenomenon was realized. The WO-coated MEA demonstrated 94% performance retention during SU/SD, the highest level to our knowledge. It can directly contribute to enhancing the durability of commercial FCEVs and be immediately applied to the MEA mass production process.
由于在启动/关闭（SU/SD）过程中催化剂腐蚀导致的耐久性差，是燃料电池电动汽车（FCEV）商业化的主要障碍。我们最近通过在WO中利用质子嵌入/脱嵌实现金属-绝缘体转变（MIT），在SU/SD条件下提高了耐久性。然而，由于其物理和化学性质，这种氧化物负载型催化剂不适用于膜电极组件（MEA）工艺的大规模生产阶段。在此，我们报告一种独特的方法，该方法在SU/SD情况下实现了相同的耐久性提高，同时可直接应用于传统的MEA制造工艺。我们在双极板、气体扩散层和MEA上涂覆WO，以研究是否实现了MIT现象。涂覆WO的MEA在SU/SD期间表现出94%的性能保持率，据我们所知这是最高水平。它可以直接有助于提高商用FCEV的耐久性，并可立即应用于MEA大规模生产工艺。
