Proton conduction is a not only a universal and fundamental process in nature but also have been widely used in energy- and environment-related applications. Achieving high-efficiency proton conduction is very important in these areas. Herein, stable and selective membranes with novel ionic nanochannels based on functionalized two-dimensional boron nitride nanocomposites (NBN) are successfully fabricated. The proton conductivity of Nafion-sNBNM at 80 °C - 95 %RH is as high as 0.44 S cm⁻¹. At the same time, NBN-sNBNM shows impressing stability at high-humidity conditions and in redox environments. The high proton conductivity could be attributed to the favorable microphysical and microchemical environments of the nanochannels in the membranes. On one side, the double-layer space among the closely assembled NBN propels the local surface-charge enhanced proton conduction. On the other side, the formation of connected long-range ionic nanochannels and quasi-isotropic architecture facilitate the long-range proton conduction. Benefiting from the excellent stability of NBN, the proton conductivity of Nafion-sNBNM at high-temperature and low-humidity conditions could be conveniently increased by H₃PO₄ adsorption. Furthermore, Nafion-sNBNM also shows low methanol permeability and high membrane selectivity. These outstanding properties of Nafion-sNBNM demonstrate great application potential in many areas.

质子传导不仅是自然界中普遍且基本的过程，而且已广泛用于与能源和环境相关的应用中。在这些领域中，实现高效质子传导非常重要。在此，成功地制备了具有基于功能化二维氮化硼纳米复合材料（NBN）的新型离子纳米通道的稳定且选择性的膜。Nafion-sNBNM在80°C-95％RH下的质子电导率高达0.44 S cm ^-1。同时，NBN-sNBNM在高湿度条件和氧化还原环境中显示出令人印象深刻的稳定性。高质子传导性可归因于膜中纳米通道的有利的微物理和微化学环境。一方面，紧密组装的NBN之间的双层空间推动了局部表面电荷增强的质子传导。另一方面，连接的远程离子纳米通道和准各向同性结构的形成促进了远程质子传导。得益于NBN的出色稳定性，H ₃ PO ₄可以方便地提高Nafion-sNBNM在高温和低湿条件下的质子传导率吸附。此外，Nafion-sNBNM还显示出低的甲醇渗透性和高的膜选择性。Nafion-sNBNM的这些出色特性证明了其在许多领域的巨大应用潜力。