【摘要】 以碳纤维(CF)为骨架,通过与高度分散的多壁碳纳米管(MWCNT)结合,添加一定量的聚四氟乙烯(PTFE)浆液为粘结剂和憎水剂,成功制备了一种新型柔性的一体式扩散层(GDL/CNT-CF).结果表明:新型扩散层具有丰富的孔隙结构,碳纳米管在碳纤维中呈梯度分布,导致其导电性与气体渗透性显著提高,可取代传统碳纸和微孔层;将其应用于直接甲醇燃料电池阴极,单池的最大功率密度相对商品扩散层提高了20%.此外,将其应用于锌空电池氧电极,最大功率密度高达200 mA/cm~2.更多还原

【Abstract】 A novel flexible integrated gas diffusion layer（GDL/CNT-CF） was successfully prepared through vacuum filtration by combining carbon fiber（CF） with high-dispersion multiwall carbon nanotubes（MWCNT） and polytetrafluoroethylene（PTFE） binder and water repellent. The results show that the new diffusion layer has abundant pore structure, and the gradient distribution of the carbon nanotubes in carbon fibers leads to a remarkable increase in conductivity and gas permeability of the material, which can replace the traditional carbon paper and microporous layer. When applied to the cathode of direct methanol fuel cell, the maximum power density of a single cell is increased by 20%. In addition, the new diffusion layer is applied to the oxygen electrode of zinc-air battery, and the maximum power density is up to 200 mA cm^-2.更多还原