A preparation method of cobalt-carbon series nanocomposites with different valence states

A nanocomposite material and a composite material technology are applied in the field of cobalt-carbon series nanocomposite materials with different valences and their preparation, which can solve the problems of increasing energy consumption, limiting electric energy conversion efficiency, limiting water splitting efficiency, etc., and achieving uniform distribution. Effect

Active Publication Date: 2021-02-02
陕西俊浩悦启信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A preparation method of cobalt-carbon series nanocomposites with different valence states
  • A preparation method of cobalt-carbon series nanocomposites with different valence states
  • A preparation method of cobalt-carbon series nanocomposites with different valence states

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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 method for preparing cobalt-carbon series nano-composite materials in different valence states, and belongs to the technical field of composite material preparation. The present invention adopts the same zeolite imidazole metal-organic framework as the precursor raw material, provides effective cobalt source and carbon source at the same time, adopts one-step or two-step reaction to obtain cobalt-carbon series nanocomposites with different valence states, and only needs one Precursors and simple processing techniques can realize nanoscale composites of cobalt and carbon in various valence states, that is, cobalt-carbon nanocomposites or cobalt oxide-carbon nanocomposites. This type of material has good catalytic performance and can be used for electrical In the field of catalysis, cobalt-carbon nanocomposites in various valence states can improve the hydrogen production by electrolysis of water or the catalytic efficiency of fuel cell electrodes, and their application requirements are becoming more and more extensive. The raw material of the invention is easy to obtain, the preparation process is simple, no surfactant, precipitant, etc. are needed, the production cost is low, and large-scale production is easy.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75H01M4/90B01J37/08B01J37/10B01J37/16
CPCB01J23/75B01J35/0033B01J35/0086B01J37/084B01J37/10B01J37/16H01M4/9083Y02E60/50
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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