Preparation method and application of carbon-based copper-cobalt oxide nanosheet catalyst

A technology of oxides and nanosheets, which is applied in the fields of metal organic framework materials, nanocatalysis, and nanomaterials. It can solve the problems of poor electrocatalytic oxygen evolution activity, poor conductivity, and limited quantity of cobalt oxides, and achieve regular shape, Good stability and high production efficiency

Inactive Publication Date: 2017-12-08
UNIV OF JINAN
View PDF2 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of MOFs, the number of MOFs precursors for electrocatalysts that are easy to prepare and transform into controllable forms is limited. At present, the preparation of oxygen evolution catalysts using three-dimensional (3D) MOFs microcrystals or nanocrystals as precursors has been reported. To the best of our knowledge, the preparation of oxygen evolution catalysts based on 1D MOFs nanofibers has not been reported
[0005] The cobalt element is abundant in the earth, and its oxide is cheap. However, the bulk cobalt oxide has poor conductivity and its electrocatalytic oxygen evolution activity is also poor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. A preparation method of carbon-based copper-cobalt oxide nanosheet catalyst

[0029] Co-dissolve copper nitrate and cobalt nitrate with a total amount of 0.63 mmol and a molar ratio of 7:3 in 15 mL of water to obtain a blue and clear copper nitrate-cobalt nitrate mixture; mix 0.40 mmol of L-aspartic acid with Dissolve 0.50 mmol of sodium hydroxide in 2.0 mL of water to obtain a clear aspartic acid base solution; add the aspartic acid base solution to the copper nitrate-cobalt nitrate mixture, and leave it at room temperature for 5 minutes to form a precipitate; Dry at 60°C to prepare Cu-MOF nanofibers loaded with Co(II) ions, namely CuCo-MOF nanofibers;

[0030] The CuCo-MOF nanofibers were placed in a tube furnace, heated under an air atmosphere at a heating rate of 3 °C / min, heated to 250 °C, kept for 2.5 h, and then cooled to room temperature at a cooling rate of 2 °C / min to obtain Carbon-based copper-cobalt oxide nanosheet catalysts.

Embodiment 2

[0032] Copper nitrate and cobalt nitrate with a total amount of 3.28 mmol and a molar ratio of 5:5 were co-dissolved in 18 mL of water to obtain a blue clear copper nitrate-cobalt nitrate mixture; 0.40 mmol of L-aspartic acid Dissolve 0.58 mmol of sodium hydroxide in 4.0 mL of water to obtain a clear aspartic acid base solution; add the aspartic acid base solution to the copper nitrate-cobalt nitrate mixture, and leave it at room temperature for 5 minutes to form a precipitate; filter after 1 hour , dried at 60°C to prepare Cu-MOF nanofibers loaded with Co(II) ions, namely CuCo-MOF nanofibers;

[0033] The CuCo-MOF nanofibers were placed in a tube furnace, heated under an air atmosphere at a heating rate of 5 °C / min, heated to 300 °C, kept for 1.5 h, and then cooled to room temperature at a cooling rate of 2 °C / min; Carbon-based copper-cobalt oxide nanosheet catalyst;

Embodiment 3

[0035] Co-dissolve copper nitrate and cobalt nitrate with a total amount of 0.63-3.28 mmol and a volume ratio of 6:4 in 16.5 mL of water to obtain a blue and clear copper nitrate-cobalt nitrate mixture; add 0.40 mmol of L-aspartic acid Acid and 0.55 mmol sodium hydroxide were dissolved in 3.0mL water to obtain a clear aspartic acid base solution; add the aspartic acid base solution to the copper nitrate-cobalt nitrate mixture, room temperature for 5min, and a precipitate was formed; after 1h, pump Filter and dry at 60°C to prepare Cu-MOF nanofibers loaded with Co(II) ions, namely CuCo-MOF nanofibers;

[0036] The CuCo-MOF nanofibers were placed in a tube furnace and heated under an air atmosphere at a heating rate of 4 °C / min, heated to 275 °C, kept for 2.0 h, and then cooled to room temperature at a cooling rate of 2 °C / min. A carbon-based copper-cobalt oxide nanosheet catalyst was prepared.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a carbon-based copper-cobalt oxide nanosheet catalyst and application to oxygen evolution by electrolyzing water based on the catalyst, and belongs to the technical fields of nano catalysis, nano materials and metal-organic framework (MOF) materials. The preparation method comprises the following main steps of blending an aspartic acid alkaline solution with a copper nitrate-cobalt nitrate solution at a room temperature, generating a sediment at the room temperature, carrying out suction filtration, and drying, so that a Cu-MOF nano fiber loaded Co(II) ion, namely a CuCo-MOF nano fiber, is prepared; heating the CuCo-MOF nano fiber in an air atmosphere, so that the carbon-based copper-cobalt oxide nanosheet catalyst is prepared. The cost of raw materials used for the preparation of the catalyst is low; the preparation process is simple; the reactive energy consumption is low; the carbon-based copper-cobalt oxide nanosheet catalyst has an industrial application prospect. The catalyst is used for efficiently catalyzing and hydrolyzing the water for the oxygen evolution and has favorable oxygen-evolution electrocatalytic activity and electrochemical stability.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon-based copper-cobalt oxide nanosheet catalyst, and belongs to the technical fields of nano-catalysis, nano-materials, and metal-organic framework materials. Background technique [0002] Due to the severe environmental pollution caused by fossil fuels, the preparation of sustainable clean and green energy has become an important frontier research field. As we all know, water is one of the most abundant resources containing hydrogen and oxygen elements on the earth. Water is decomposed to generate hydrogen and oxygen, and hydrogen is converted into water after exothermic combustion. This process is regenerative, clean and green. Electrocatalytic direct water splitting to produce hydrogen and oxygen is considered the most efficient way to achieve this process. The electrocatalytic water splitting reaction includes two half-reactions, hydrogen evolution reaction (HER) and oxygen evo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/02B01J37/03B01J37/08C25B1/04C25B11/06
CPCB01J23/002B01J23/75B01J35/0013B01J35/0093B01J35/023B01J37/031B01J37/082C25B1/04C25B11/091Y02E60/36
Inventor 匡轩孙旭魏琴张勇吴丹
Owner UNIV OF JINAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap