基于TiN纳米管/纳米花复合结构的超级电容器性能研究

Supercapacitive performance based on TiN nanotube/nanopetal composite structure

TiO2纳米材料是超级电容器电极材料的研究热点之一。通过钛箔的阳极氧化和磷酸浸泡处理后成功制备出TiO2纳米管/纳米花复合结构。该复合结构经过高温氮化后成功地转变为TiN纳米管/纳米花结构。研究发现,在TiN的高导电性和纳米管/纳米花结构的高比表面积的协同作用下,TiN纳米管/纳米花复合电极显现出优异的电化学性能。当电流密度为0.1 mA·cm^-2时,面积比电容达53.1 mF·cm^-2,而当电流密度增加到10 mA·cm^-2时,面积比电容仍可保持为34.8 mF·cm^-2,显示出良好的倍率特性;经过5000圈的循环稳定性测试后,其容量仍能保持为初始容量的90%,电化学稳定性优异。

TiO2 nanomaterials are one of the research hotspots in electrode materials for supercapacitor.TiO2 nanotube/nanopetal composite structure was successfully prepared by anodization of thetitanium foil and subsequent immersion treatment with the phosphoric acid.The composite structure can be successfully transformed into TiN nanotube/nanopetal structure after the nitridation.The results indicate that TiN nanotube/nanopetal composite electrode exhibites excellent electrochemical performance under the synergistic effect of high electrical conductivity of TiN and high specific surface area of nanotube/nanopetal structure.When the current density is 0.1 mA·cm^-2,the area specific capacitance reaches 53.1 mF·cm^-2.Even the current density increases to 10 mA·cm^-2,the area specific capacitance remains at 34.8 mF·cm^-2,demonstrating good rate capability of the material.After 5000 cycles of cyclic stability test,its capacity can still be maintained at 90%of the initial capacity,indicating excellent electrochemical stability.