Preparation method of different valence cobalt-carbon nanometer composite materials

A nanocomposite material and composite material technology, applied in different valence cobalt-carbon series nanocomposite materials and its preparation field, can solve the problems of increased energy consumption, high reserves, limited water splitting efficiency, etc., and achieve the effect of uniform distribution

Active Publication Date: 2018-05-18
陕西俊浩悦启信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Photolysis of water, especially electrolysis of water, has become an important means and one of the most effective methods to achieve industrialized and cheap production of hydrogen. However, the slow kinetic process of oxygen evolution reaction (OER) greatly limits the efficiency of water splitting and increases the energy consumption. consume
The slow cathode oxygen reduction reaction (ORR) kinetics of fuel cells also greatly limits the power conversion efficiency.
[0003] At present, the commercial oxygen evolution catalyst is mainly IrO 2 and RuO 2 and other precious metals, commercial fuel cell catalysts are noble metal Pt, their high price and rare reserves restrict the development of new energy storage and conversion, therefore, finding low-cost and abundant non-precious metal catalysts has become a research hotspot in recent years

Method used

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  • Preparation method of different valence cobalt-carbon nanometer composite materials
  • Preparation method of different valence cobalt-carbon nanometer composite materials
  • Preparation method of different valence cobalt-carbon nanometer composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Mix cobalt salts and imidazole ligands in a molar ratio of 1:3.667 in a mixed solvent of methanol and ethanol (v:v=1:1), stir the mixed solution for 30 minutes, and let stand at room temperature for 24 hours. The resulting product is washed, Filter and dry at 80°C for later use. The cobalt-carbon nanocomposite material can be obtained by pyrolyzing the prepared zeolite imidazole metal organic framework material as a precursor at a high temperature of 600 degrees for 3 hours in an inert atmosphere.

Embodiment 2

[0020] Mix cobalt salts and imidazole ligands in a molar ratio of 1:3.667 in a mixed solvent of methanol and ethanol (v:v=1:1), stir the mixed solution for 30 minutes, and let stand at room temperature for 24 hours. The resulting product is washed, Filter and dry at 80°C for later use. The prepared zeolite imidazole-based metal-organic framework material is used as a precursor and decomposed by hydrothermal heat at 140 degrees for 9 hours to obtain tricobalt tetroxide-carbon nanocomposite material.

Embodiment 3

[0022] Mix cobalt salts and imidazole ligands in a molar ratio of 1:3.667 in a mixed solvent of methanol and ethanol (v:v=1:1), stir the mixed solution for 30 minutes, and let stand at room temperature for 24 hours. The resulting product is washed, Filter and dry at 80°C for later use. Weigh 50 mg of zeolite imidazole metal organic framework material as a precursor and disperse it in 50 ml of ethanol aqueous solution, add 3 mL of 1M sodium borohydride aqueous solution to the ice-water bath, stir for 5 minutes, and then place it in a hydrothermal reaction kettle for 7 hours at 150 degrees to react. A cobaltous hydroxide-carbon nanocomposite material is obtained.

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Abstract

The invention discloses a preparation method of different valence cobalt-carbon nanometer composite materials and belongs to the technical field of composite material preparation. Through use of the same zeolite imidazole metal organic skeleton as a precursor raw material and effective cobalt and carbon sources, the different valence cobalt-carbon nanometer composite materials are produced througha one-step or two-step reaction. Only through one precursor and simple processes, the nanometer compounding of different valence cobalt and carbon is realized and the cobalt-carbon nanometer composite material or cobalt oxide-carbon nanometer composite material is obtained. The composite material has good catalytic performances and can be used in the field of electrocatalysis. The different valence cobalt-carbon nanometer composite materials improve the water electrolysis hydrogen production or fuel battery electrode catalytic efficiency and have a wide application range. The preparation method utilizes easily available raw materials, has simple processes, is free of a surfactant and a precipitator, realizes a low production cost and is easy to industrialize in large scale.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a cobalt-carbon series nanocomposite material with different valence states and a preparation method thereof. Background technique [0002] With the development of social economy and the continuous growth of the world population, human consumption of fossil fuels, such as coal and oil, has brought unprecedented pressure and challenges to the existing energy reserves and the natural environment. Using clean energy such as solar energy and wind energy can effectively reduce dependence on fossil fuels. However, due to the intermittent nature of these clean energies, high-efficiency energy carriers and energy conversions have become necessary and crucial conditions for the large-scale application of such clean energies. Hydrogen is an ideal energy carrier because of its high efficiency, low cost, sustainability, and environmental friendliness, and ...

Claims

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Application Information

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IPC IPC(8): B01J23/75H01M4/90B01J37/08B01J37/10B01J37/16
CPCH01M4/9083B01J23/75B01J37/084B01J37/10B01J37/16B01J35/398B01J35/33Y02E60/50
Inventor 魏学东李娜
Owner 陕西俊浩悦启信息科技有限公司
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