Blocking the sulfonate group in Nafion to unlock platinum's activity in membrane electrode assemblies
Blocking the sulfonate group in Nafion to unlock platinum's activity in membrane electrode assemblies
复制标题
DOI：
10.1038/s41929-023-00949-w
复制
发表时间：
2023-04-17
期刊：
影响因子：
37.8
通讯作者：
Wei, Zidong
中科院分区：
文献类型：
--
作者：
Chen, Fadong;Chen, Siguo;Wei, Zidong
离聚物磺酸盐基团在膜电极组件（MEA）中铂基催化剂上的特异性吸附严重限制了铂的催化活性、铂的利用率、质子传导率和质量传递。在这里，我们报告了使用环己醇的阻断策略，以减轻Nafion离聚物的不利影响。环己醇具有椅型或船型构象，通过与离聚物配位，阻断了离聚物在Pt表面的吸附路径，释放了Pt活性中心，显著改善了传质路径，该膜电极在动力学和传质区域表现出显著的性能改善，沿着具有较强的稳定性。该策略为调节Pt/离聚物界面和提高Pt在MEA中的催化活性提供了方向。
The specific adsorption of ionomer sulfonate groups on Pt-based catalysts in membrane electrode assemblies (MEAs) has severely restricted Pt catalytic activity, Pt utilization, proton conductivity and mass transport. Here we report a blocking strategy using cyclohexanol to mitigate the detrimental impacts of the Nafion ionomer. Cyclohexanol with a chair or boat conformation blocked the adsorption path of the ionomer onto the Pt surface via coordination with the ionomer, which released the Pt activity sites and dramatically improved the mass transport path. This MEA with cyclohexanol exhibits striking performance improvement in the kinetic and mass transport regions, along with strong stability. The proposed strategy provides a direction to tune the Pt/ionomer interface and improve the catalytic activity of Pt in MEA.