Cockscomb-shaped cobaltous tungstate nanometer material as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a cockscomb-shaped cobaltous tungstate nanometer material. The preparation method concretely comprises the following steps of adding a certain amount ofcobalt salt in an ethylene glycol-containing solvent, and preparing a cobalt salt solution with a concentration being 0.05-0.8mol / L, weighing sodium tungstate with an equal molar weight of the cobaltsalt in the cobalt salt solution, performing uniform stirring to form a mixed solution; adding the mixed solution in a reaction kettle, performing crystallization for 6-18h at the temperature of 140-220 DEG C, naturally cooling an obtained product to the room temperature, performing washing, and then performing drying for 10-12h under the condition with the temperature being 55-65 DEG C to obtainthe cobaltous tungstate nanometer material. The preparation method of the cockscomb-shaped cobaltous tungstate nanometer material has the advantages of simpleness in preparation method, special morphology, low cost and the like, has good electrochemical performance in a KOH electrolyte, realizes excellent specific capacitance, cycle life and rate capability in a three-electrode system and has thespecific capacitance reaching 1016Fg<-1> under the condition of 1A g<-1>. After 5000 cycles of charge / discharge, the capacitance retention ratio of a cobaltous tungstate electrode still reaches 90 percent.

Description

technical field [0001] The invention belongs to the field of preparation of supercapacitor electrode materials, in particular to a cockscomb-shaped cobalt tungstate nanomaterial and its preparation method and application. Background technique [0002] A supercapacitor is an energy storage device that sits between a battery and a conventional capacitor. Because of its high charge and discharge efficiency, high power density, long cycle life, and environmental friendliness, it is widely used in transportation, mobile communications, information technology, aerospace and national defense technology and other fields. Cobalt tungstate is a very important functional material, which has a very wide range of applications in the fields of photocatalysis, optical fibers, capacitors, and electrocatalytic oxidation. There are many preparation methods of cobalt tungstate, co-precipitation method, hydrothermal method, solvothermal method, microemulsion method, etc. There are also many sh...

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Problems solved by technology

There are many preparation methods of cobalt tungstate, co-precipitation method, hydrothermal method, solvothermal method, microemulsion method, etc. There are also many shapes of cobalt tungstate, such as cobalt tungstate nanowires, nanorods, nanospheres, etc. But the cockscomb-shaped shape has not been seen yet

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