Liang Xian, Ge Xiaolin, He Yubin, Xu Mai, Shehzad Muhammad A, Sheng Fangmeng, Bance-Soualhi Rachida, Zhang Jianjun, Yu Weisheng, Ge Zijuan, Wei Chengpeng, Song Wanjie, Peng Jinlan, Varcoe John R, Wu Liang, Xu Tongwen
CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Applied Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, 230026, P. R. China.
School of Chemistry and Material Engineering, Huainan Normal University, Huainan, Anhui, 232001, P. R. China.
Adv Sci (Weinh). 2021 Nov;8(22):e2102637. doi: 10.1002/advs.202102637. Epub 2021 Oct 11.
Polymer electrolyte membrane fuel cells can generate high power using a potentially green fuel (H ) and zero emissions of greenhouse gas (CO ). 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 H /O AEMFC test demonstration shows promisingly high power densities (1.5 W cm 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 .
聚合物电解质膜燃料电池可以使用潜在的绿色燃料（氢气）产生高功率，并且温室气体（二氧化碳）零排放。然而，膜电极组件（MEA）的界面区域，即膜与催化剂层之间存在显著的传质阻力，这仍然是实现具有高功率密度和长期稳定性的MEA的一个障碍。在此，提出了一种三维界面拉链概念来克服这一挑战。乙烯基苄基封端的双阳离子季铵基聚电解质被用作阴离子交换膜（AEM）和催化剂层中的阴离子交换剂。通过末端乙烯基的热诱导交联形成含季铵的共价锁定界面。界面结合强度的非原位评估和原位耐久性测试表明，这种三维拉链界面策略可防止界面分层，且不会牺牲燃料电池性能。氢气/氧气AEMFC测试演示显示出令人瞩目的高功率密度（在70°C、100%相对湿度和0.2MPa背压气体进料条件下为1.5W/cm²），在0.6A/cm²的有效高电流密度下可保持性能至少120小时。
