Preparation of Non-stoichiometric Titanium Dioxide/Carbon Nanofiber Electrode and Its Performance for Supercapacitor
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摘要: 采用静电纺丝—浸渍—煅烧方法,制备一体化的非化学计量比二氧化钛/纳米碳纤维电极,并用于超级电容的制作中。电极由直径为80~100 nm的碳纤维作为基底,纤维外覆盖细小的TiO2纳米颗粒,通过在惰性气氛中的高温煅烧,获得非化学计量比的TiO2。最终,900℃下煅烧获得的电极在0.2 A/g的电流密度下,放电电容达到222.81F/g,且2 A/g的电流密度下6 000次循环后电容保持率达到92%,体现出优良的超级电容性能和循环性能。Abstract: An integrated non-stoichiometric titanium dioxide/carbon nanofiber electrode was prepared by electrospinning-impregnating-calcination method and used for supercapacitor.Fine TiO2 nanoparticles were anchored onto the surface of carbon nanofiber substrate with the diameter of 80~100 nm.And non-stoichiometric TiO2nanoparticles were obtained by calcination at high temperature in inert atmosphere.The sample calcined at 900℃exhibits the highest capacitance with 222.81 F/g discharge capacitance at 0.2 A/g current density,and good cycle stability with 92%retention rate at 2 A/g current density after 6 000 cycles.
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Key words:
- TiO2 /
- nanofibers /
- non-stoichiometric /
- supercapacitor
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