3D-Zipped Interface: In Situ Covalent-Locking for High Performance of Anion Exchange Membrane Fuel Cells.
3D-Zipped Interface: In Situ Covalent-Locking for High Performance of Anion Exchange Membrane Fuel Cells.
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3D 压缩界面：原位共价锁定实现阴离子交换膜燃料电池的高性能
DOI：
10.1002/advs.202102637
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Xu T
中科院分区：
文献类型：
--
作者：
Liang X;Ge X;He Y;Xu M;Shehzad MA;Sheng F;Bance-Soualhi R;Zhang J;Yu W;Ge Z;Wei C;Song W;Peng J;Varcoe JR;Wu L;Xu T
聚合物电解质膜燃料电池可以利用潜在的绿色燃料(H2)和零温室气体排放(CO2)来产生高功率。然而，在膜电极组件(MEAs)的界面区域，膜和催化层之间存在显著的传质阻力，这仍然是实现高功率密度和长期稳定的MEAs的障碍。这里，提出了一种3D界面拉链的概念来克服这一挑战。在阴离子交换膜(AEM)和催化层中，均采用端乙烯基苄基双阳离子季铵盐聚电解质作为离聚体。通过末端乙烯基团的热诱导交联形成了含季铵盐的共价锁定界面。界面结合强度的异地评估和现场耐久性测试表明，这种3D拉链界面策略在不牺牲燃料电池性能的情况下防止了界面分层。H_2/O_2质子交换膜燃料电池的测试演示显示出很高的功率密度(70℃时1.5W cm−2,100%相对湿度和0.2兆帕背压气体进气)，在0.6A cm−2的高电流密度下可以保持至少120h的性能。报道了一种三维界面拉链设计，通过在催化层和阴离子交换膜中离聚体末端乙烯基团的热诱导交联来原位制备界面共价锁定膜电极组件。界面结合强度的异地评估和现场耐久性测试表明，3D拉链界面策略在不牺牲燃料电池性能的情况下防止了界面分层。
Polymer electrolyte membrane fuel cells can generate high power using a potentially green fuel (H2) and zero emissions of greenhouse gas (CO2). However, significant mass transport resistances in the interface region of the membrane electrode assemblies (MEAs), between the membrane and the catalyst layers remains a barrier to achieving MEAs with high power densities and long‐term stabilities. Here, a 3D‐interfacial zipping concept is presented to overcome this challenge. Vinylbenzyl‐terminated bi‐cationic quaternary‐ammonium‐based polyelectrolyte is employed as both the anionomer in the anion‐exchange membrane (AEM) and catalyst layers. A quaternary‐ammonium‐containing covalently locked interface is formed by thermally induced inter‐crosslinking of the terminal vinyl groups. Ex situ evaluation of interfacial bonding strength and in situ durability tests demonstrate that this 3D‐zipped interface strategy prevents interfacial delamination without any sacrifice of fuel cell performance. A H2/O2 AEMFC test demonstration shows promisingly high power densities (1.5 W cm−2 at 70 °C with 100% RH and 0.2 MPa backpressure gas feeds), which can retain performances for at least 120 h at a usefully high current density of 0.6 A cm−2. A 3D‐interfacial zipping design is reported to in situ fabricate interfacial covalently locked membrane electrode assembly by thermally induced inter‐crosslinking of the terminal vinyl groups of the ionomer in the catalyst layers and the anion‐exchange membrane. Ex situ evaluation of interfacial bonding strength and in situ durability tests demonstrate that the 3D‐zipped interface strategy prevents interfacial delamination without any sacrifice of fuel cell performance.
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