Tin oxide nanocubes/sulfonated bentonite (SnO₂/sBH) nanocomposite blended with acidified poly ether ether ketone (SPEEK) solid state electrolyte is developed for DMFCs. Morphological investigations reveal the existence of SnO₂ nanocubes on sheet-like structure of sBH and the uniform dispersion of above composite on SPEEK matrix. The layered sheet-like structure of BH act as heat diffusion barrier and the ceramic feature of SnO₂ further improves the thermal stability of a SPEEK membrane. The exposed large surface area of BH and tightly bound water molecules in SnO₂ and -SO₃H sites increase the water retention properties, which consequently enhance the ionic conductivity of SPEEK/sBH/SnO₂ composite membrane. Furthermore, the high aspect ratio of sBH and methanol resistive characteristic of SnO₂ lower the methanol diffusion channels in the sBH/SnO₂ composite membrane. With the coalition of above significant electrochemical properties, SPEEK/sBH/SnO₂ solid electrolyte demonstrates the high DMFC power density and excellent durability, which showers light on the viability of prepared membrane in high performance and durable DMFCs.

为DMFC开发了与酸化聚醚醚酮（SPEEK）固态电解质共混的氧化锡纳米立方/磺化膨润土（SnO ₂ / sBH）纳米复合材料。形态学研究表明，在sBH的片状结构上存在SnO ₂纳米立方体，并且上述复合物均匀分散在SPEEK基质上。BH的层状片状结构充当了热扩散屏障，SnO ₂的陶瓷特征进一步改善了SPEEK膜的热稳定性。BH暴露的大表面积以及SnO ₂和-SO ₃ H位置中紧密结合的水分子增加了保水性能，因此提高了SPEEK / sBH / SnO ₂的离子电导率复合膜。此外，sBH的高长径比和SnO ₂的耐甲醇特性降低了sBH / SnO ₂复合膜中的甲醇扩散通道。通过结合上述显着的电化学性能，SPEEK / sBH / SnO ₂固体电解质表现出较高的DMFC功率密度和出色的耐用性，这充分说明了制备的膜在高性能和耐用DMFC中的可行性。