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Preparation method of cobalt molybdate/nickel cobaltate composite material with three-dimensional flower-ball-shaped structure

A spherical structure and composite material technology, applied in the field of composite materials and energy storage applications, can solve the problems of low capacitance value, pseudo-capacitor instability, etc., and achieve improved energy storage performance, excellent electrochemical performance, improved electrochemical performance and the effect of its stability

Inactive Publication Date: 2020-08-25
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a huge gap between theory and applications due to the instability and lower capacitance value of pseudocapacitors (compared to theoretical capacitance)

Method used

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  • Preparation method of cobalt molybdate/nickel cobaltate composite material with three-dimensional flower-ball-shaped structure
  • Preparation method of cobalt molybdate/nickel cobaltate composite material with three-dimensional flower-ball-shaped structure
  • Preparation method of cobalt molybdate/nickel cobaltate composite material with three-dimensional flower-ball-shaped structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1mmoL cobalt nitrate, 0.33mmoL nickel nitrate and 0.33mmoL sodium molybdate were added to 20mL deionized water respectively, and after stirring and dissolving, they were uniformly mixed to obtain a clear solution, and then the obtained clear solution was transferred to a hydrothermal reaction kettle, and heated at 180 After hydrothermal reaction at ℃ for 12 h, naturally cooled to room temperature, the product was taken out, washed with water and ethanol by centrifugation, and then dried at 60 °C for 12 h to obtain CoMoO 4 / NiCo 2 o 4 precursor. Then put the obtained precursor material into a tube furnace for calcination, and anneal at 350 °C for 2 h at a heating rate of 2 °C / min in an Ar atmosphere to obtain CoMoO 4 with NiCo 2 o 4 CoMoO with a theoretical molar ratio of 1:1 and a three-dimensional flower spherical structure 4 / NiCo 2 o 4 Composite materials, their structure and properties see figure 1 , 2 , 3.

Embodiment 2

[0021]1mmoL cobalt nitrate, 0.4mmoL nickel nitrate and 0.2mmoL sodium molybdate were added to 20mL deionized water respectively, stirred and dissolved, and mixed evenly to obtain a clear solution, then the obtained clear solution was transferred to a hydrothermal reaction kettle, and heated at 180 After hydrothermal reaction at ℃ for 12.5 h, the product was naturally cooled to room temperature, and the product was taken out, washed with water and ethanol, and dried at 60 °C for 12 h to obtain the cobalt molybdate precursor. Then put the obtained precursor material into a tube furnace for calcination, and anneal at 355 °C for 2 h at a heating rate of 2 °C / min in an Ar atmosphere to obtain CoMoO 4 with NiCo 2 o 4 CoMoO with a theoretical molar ratio of 1:2 4 / NiCo 2 o 4 Composite materials, their structure and properties see figure 1 , 2 .

Embodiment 3

[0023] Add 1mmoL cobalt nitrate, 0.25mmoL nickel nitrate and 0.5mmoL sodium molybdate into 20mL deionized water respectively, stir and dissolve them and mix them uniformly to obtain a clear solution, then transfer the obtained clear solution to a hydrothermal reaction kettle, and set the temperature at 185 After hydrothermal reaction at ℃ for 12 h, the product was naturally cooled to room temperature, and the product was taken out, washed with water and ethanol by centrifugation, and then dried at 60 °C for 12 h to obtain the cobalt molybdate precursor. Then the obtained precursor material was put into a tube furnace for calcination, and annealed at 350 °C for 2.5 h at a heating rate of 1 °C / min in an Ar atmosphere to obtain CoMoO 4 with NiCo 2 o 4 Three-dimensional flower-like spherical structure CoMoO with a theoretical molar ratio of 2:1 4 / NiCo 2 o 4 Composite materials, their structure and properties see figure 1 , 2 .

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Abstract

The invention discloses a preparation method of a cobalt molybdate / nickel cobaltate composite material with a three-dimensional flower-ball-shaped structure. Cobalt nitrate and nickel nitrate are usedas a cobalt source, a nickel source and a molybdenum source.. By controlling the compounding molar ratio of CoMoO4 to NiCo2O4 by adjusting the atomic ratio of the molybdenum source to the nickel source to the molybdenum source, and controlling the morphology of the CoMoO4 / NiCo2O4 composite material, the CoMoO4 / NiCo2O4 composite material with a three-dimensional flower-ball-shaped structure is acquired. According to the structure, the surface area of the three-dimensional flower ball can be fully utilized; meanwhile, the gaps formed by orderly arranging the flower ball sheet layers can betterrelieve the deformation caused by ion deintercalation and intercalation in an electrochemical reaction; and meanwhile, the transition metal oxide contains multiple valence states, so that the transition metal oxide has more excellent electrochemical performance due to the synergistic effect between double metals, and the energy storage performance of the electrode material can be further improved.Therefore, the composite material disclosed by the invention has a wide prospect in the practical application of preparing a supercapacitor.

Description

technical field [0001] The invention relates to a method for preparing a cobalt molybdate / nickel cobaltate composite material with a three-dimensional flower spherical structure, which can be used as an electrode material in a supercapacitor, and belongs to the technical field of composite materials and the field of energy storage applications. Background technique [0002] In recent years, as an efficient and clean energy storage element, supercapacitor (SC) has attracted extensive attention in scientific research and industry due to its advantages of large discharge power of traditional capacitors and high energy density of batteries. The overall performance of supercapacitors currently lies between conventional dielectric capacitors and batteries. Due to the characteristics of fast charging speed, high power density, long cycle life, safety and environmental protection, supercapacitors have important application prospects in commercial, industrial, aerospace and other fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/86
CPCH01G11/24H01G11/46H01G11/86Y02E60/13
Inventor 郭瑞斌姜洋洋莫尊理刘晶晶高琴琴刘桂桂董奇兵
Owner NORTHWEST NORMAL UNIVERSITY
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