Traditional dense microporous layers (MPLs) are suitable for low-temperature proton exchange membrane fuel cells (PEMFCs), but they greatly hinder mass transport in high-temperature PEMFCs. Here, we report a novel cathode MPL based on reticulated polyaniline nanowires that were grown on carbon paper via in-situ electropolymerization. The maximum power density of the high-temperature PEMFC based on the new MPL was 476 mW/cm², which was 36% higher than that based on a conventional MPL. Oxygen gain tests and electrochemical impedance spectroscopy showed that the new MPL accelerated oxygen transfer due to its unique pore size distribution, which ultimately improved the performance of the HT-PEMFC.

传统的致密微孔层（MPL）适用于低温质子交换膜燃料电池（PEMFC），但它们极大地阻碍了高温PEMFC中的质量传输。在这里，我们报告了一种基于网状聚苯胺纳米线的新型阴极MPL，该碳纳米管通过原位电聚合生长在复写纸上。基于新型MPL的高温PEMFC的最大功率密度为476 mW / cm ²，比传统MPL的最高功率密度高36％。氧气增益测试和电化学阻抗谱表明，新型MPL由于其独特的孔径分布而加快了氧气的转移，最终改善了HT-PEMFC的性能。