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.

离聚物磺酸盐基团在膜电极组件 (MEA) 中的 Pt 基催化剂上的特异性吸附严重限制了 Pt 催化活性、Pt 利用率、质子传导性和质量传输。在这里，我们报告了一种使用环己醇来减轻 Nafion 离聚物的不利影响的阻断策略。具有椅形或船形构象的环己醇通过与离聚物的配位阻断了离聚物在 Pt 表面的吸附路径，从而释放了 Pt 活性位点并显着改善了传质路径。这种含有环己醇的 MEA 在动力学和质量传输区域表现出显着的性能改进，同时具有很强的稳定性。所提出的策略为调整 Pt/离聚物界面和提高 Pt 在 MEA 中的催化活性提供了方向。