【摘要】 目的制备高比容量多孔钛/TiO₂纳米管三维自支撑一体化复合电极材料。方法采用非溶剂致相分离法与高温烧结相结合的方法制备出孔径小、空间利用率高的三维多孔钛平板膜,然后经阳极氧化法在其表面生长TiO₂纳米管,从而制备出多孔钛/TiO₂纳米管复合薄膜电极。结果以3μm粒径钛粉为原料,N-甲基-2-吡咯烷酮、聚乙烯吡咯烷酮、聚丙烯腈为添加剂制备钛膜生坯,经刮膜成型后,在氩气保护下经1000℃烧结,得到孔径约为2～6μm的多孔钛平板膜。采用阳极氧化法在多孔钛平板膜上直接生长TiO₂纳米管,制得多孔钛/TiO₂纳米管复合薄膜电极。该复合薄膜电极在超级电容器中具有良好的电化学性能,其在2m A/cm2电流密度下,比电容为385.34m F/cm2,即使电流密度增加到10m A/cm2,比电容仍能保持在125.14m F/cm2。结论相较于TiO₂纳米颗粒,采用此方法制备的多孔钛/TiO₂纳米管复合薄膜电极具有良好的电化学性能,可为下一代储能器件提供新的思路。更多还原

【Abstract】 The works aims to prepare a novel and freestanding three dimensional（3 D） porous Ti/TiO₂ nanotubes（Ti/TiO₂ NTs） composite membrane electrode with high capacity. The 3 D porous Ti membrane with small pore size and high volume utilization was prepared by nonsolvent induce phase separation（NIPS） and high temperature sintering. Anodic oxidizing process was adopted to generate TiO₂ nanotubes on the surface so as to prepare the porous Ti/TiO₂ NTs composite membrane electrode. The raw Ti membrane was obtained by 3 μm Ti powder, NMP, PVP and PAN. After being scraped, the as-prepared Ti membrane was sintered at 1000 ℃ in argon atmosphere to obtain the porous Ti membrane with pore size of 2～6 μm. TiO₂ NTs were directly grown on the Ti surface by anodic oxidizing to obtain the Ti/TiO₂ NTs composite membrane electrode. This novel Ti/TiO₂ NTs composite membrane electrode showed excellent electrochemical performance for supercapacitor applications. The specific capacitance was up to 385.34 mF/cm2 at current density of 2 mA/cm2. Remarkably, the capacitance still kept 125.14 mF/cm2 at a higher current density of 10 mA/cm2. Compared to TiO₂ nanoparticles, the porous Ti/TiO₂ NTs composite membrane electrode exhibits outstanding electrochemical performance and provides a new way for next-generation storage equipment.更多还原