NiCo2O4/carbon nanotube composite electrode material and preparation method thereof

Abstract

The invention provides a NiCo2O4 / carbon nanotube composite electrode material and a preparation method thereof. To be specific, the invention relates to a NiCo2O4 / carbon nanotube composite electrode material having a core-shell structure using the carbon nanotube as a core and the NiCo2O4 nanotube as a shell and the overall shape of the material is a height-ordered nanotube array. The preparationmethod comprises: step one, selecting a double-pass aluminium oxide template with a pore diameter of 200 nm, carrying out magnetron sputtering on the back of the template to form a copper film with the thickness of 1 micron, and carrying out trimethylsilyl cyanide, ethyl alcohol, and distilled water ultrasonic cleaning successively, and then carrying out drying; step two, with processed porous aluminium oxide as a template, preparing a nickel-cobalt alloy nanotube array in an electrolytic tank by using a square-wave pulse electro-deposition method; step three, depositing carbon nanotubes in the nickel-cobalt alloy nanotubes by using a chemical vapor deposition method; and step four, removing the aluminium oxide template by using NaOH and carrying out calcination to obtain a NiCo2O4 / carbonnanotube composite material. The NiCo2O4 / carbon nanotube composite obtained by the method has a high specific capacitance value and good electrochemical performance stability when being applied to thesupercapacitor electrode material.

Description

technical field [0001] The present invention relates to a NiCo 2 o 4 The invention discloses a carbon nanotube composite electrode material and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] In recent years, due to its high power density, short charging time and long cycle life, supercapacitors are widely used in communication, aerospace, large industrial equipment, microelectronic devices and many other occasions that require instantaneous release of large currents, especially It has broad application prospects in the field of new energy vehicles. Electrode material is a key factor affecting the performance of supercapacitors, with RuO 2 Such noble metal oxides have large specific capacitance due to their pseudocapacitive principle, but their high price and toxicity limit their commercial application. Some cheap metal oxides instead of noble metals as electrode materials for supercapacitors have become a resea...

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Problems solved by technology

Leela et al. (Asymmetric Flexible Supercapacitor Stack, Nonoscale Research Letters, 2008) used the sol-gel method to prepare metal oxide / multi-walled carbon nanotube composite electrode materials, which showed excellent electrochemical performance, but the sol-gel method added surfactants, Easy to introduce impurities, and the cost is high; Kuan et al (Electrodeposition of Nickel and CobaltMixed Oxide / Carbon Nanotube Thin Films and Their Charge Storage Properties, J. Electorchem. / carbon nanotube coposites, Electrochim. Acta. 2007) and Wen et al. (A three dimensional vertically aligned multiwall carbon nanotube-NiCo 2 o 4 core-shell structure for novel high-performance supercapacitors, J. Mater.Chem. A, 2014) Cobalt-nickel oxide / carbon nanotube composites were prepared by electrochemical deposition method, which has long reaction time and high energy consumption; China The patent (CN1315139C) provides a method for compounding carbon nanotubes and transition oxides, using a binder to compound carbon nanotubes and transition metal oxides. The addition of binders will increase the internal resistance of the material, which is not conducive to the compounding materials as electrode materials for supercapacitors