Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of bifunctional cobalt diselenide material and its preparation and application

A technology of cobalt diselenide and cobalt salt, which is applied in the direction of binary selenium/tellurium compounds, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of catalytic activity, stability and electrocatalytic properties, and achieve the preparation The effect of simple method and high catalytic activity

Active Publication Date: 2020-07-28
HUAZHONG UNIV OF SCI & TECH RES INST SHENZHEN +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a bifunctional cobalt diselenide material and its preparation and application, especially in combination with the specific application of hydrazine hydrate oxidation and hydrogen evolution catalysts to the diselenide. The preparation of cobalt material is redesigned, and the parameter conditions (such as the specific type and matching of reactants, reaction temperature and time, etc.) By further optimizing and controlling the specific composition and microscopic morphology of cobalt diselenide materials, correspondingly, cobalt diselenide bifunctional catalysts with greatly improved catalytic activity can be obtained. The disadvantages and technical problems of unsatisfactory electrocatalytic properties such as catalytic activity and stability, especially in the oxidation of hydrazine hydrate and the precipitation of hydrogen

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of bifunctional cobalt diselenide material and its preparation and application
  • A kind of bifunctional cobalt diselenide material and its preparation and application
  • A kind of bifunctional cobalt diselenide material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The present invention provides a method for preparing cobalt diselenide, which includes the following steps:

[0034] (1) Put the mixed aqueous solution of soluble cobalt salt, soluble ammonium salt and carbon-containing precipitant together with the conductive substrate in a hydrothermal reaction vessel for hydrothermal reaction to obtain a cobalt precursor; wherein the mixed aqueous solution is soluble The molar ratio of cobalt salt, soluble ammonium salt and carbon-containing precipitant may be 1:(1-20):(10-50), and the concentration of the soluble ammonium salt in the mixed aqueous solution may be 0.01-0.3 mol / L;

[0035] The conductive substrate can be conductive glass or conductive metal substrate, such as foamed nickel, foamed copper, etc., preferably foamed nickel; foamed nickel can be of various sizes. The carbon-containing precipitant is preferably urea. Under the temperature of hydrothermal reaction, urea reacts with other raw materials to combine metal atoms af...

Embodiment 1

[0041] figure 1 The preparation process of the dual-functional catalyst cobalt diselenide provided in this example is shown, including the following steps:

[0042] (1) Precursor preparation: 2.5mmol of cobalt nitrate, 10mmol of ammonium fluoride, 25mmol of urea raw materials were dissolved in 40mL of deionized water and reacted hydrothermally at 120°C for 16 hours. The precursor is obtained by washing and drying.

[0043] (2) Stable cobalt diselenide nanotubes: Mix selenium powder and sodium hydroxide at a molar ratio of 3.75 millimoles to 7.5 millimoles with 0.14 milliliters of hydrazine hydrate (85% by mass) and 50 milliliters of dimethylamide. Put the cobalt basic carbonate precursor into the two-step hydrothermal selenization reaction, react at 180°C for 1 hour, and obtain the cobalt diselenide catalyst after the reaction is dried. figure 2 The scanning electron microscope image of the stable cobalt diselenide catalyst provided by the example of the present invention is shown...

Embodiment 2

[0046] (1) Precursor preparation: 2.5mmol of cobalt nitrate, 10mmol of ammonium fluoride, 25mmol of urea raw materials were dissolved in 40mL of deionized water and reacted hydrothermally at 120°C for 16 hours. The precursor is obtained by washing and drying.

[0047] (2) Stable cobalt diselenide nanotubes: Mix selenium powder and sodium hydroxide at a molar ratio of 3.75 millimoles to 7.5 millimoles with 1 ml of hydrazine hydrate (85% by mass) and 50 ml of dimethylamide. Put the cobalt basic carbonate precursor into the two-step hydrothermal selenization reaction, react at 180°C for 1 hour, and obtain the cobalt diselenide catalyst after the reaction is dried.

[0048] (3) Preparation of electrode: The cobalt diselenide catalyst was finally dried at 60° C. for 6 hours, and small pieces of 1 square centimeter were cut out to obtain electrodes. The electrochemical performance of the catalyst was carried out in a three-electrode test cell. Ag / AgCl was used as the reference electrode...

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

No PUM Login to View More

Abstract

The invention discloses a bifunctional cobalt diselenide material and its preparation and application. The preparation method includes the following steps: (1) Mixing a mixed aqueous solution of soluble cobalt salt, soluble ammonium salt and carbon-containing precipitant with a conductive substrate Perform a hydrothermal reaction together to obtain a precursor containing cobalt element grown on a conductive substrate; (2) conduct a mixed solution of selenium powder, alkali, reducing agent and organic solvent together with the precursor containing cobalt element in step (1) Hydrothermal selenization reaction, drying after the reaction is completed, to obtain cobalt diselenide material. The present invention specifically redesigns the preparation of the cobalt diselenide material by combining the specific applications of hydrazine hydrate oxidation and hydrogen evolution catalysts, and specifically selects and optimizes the overall flow process design of the preparation method and the parameter conditions used in each step. , by optimizing and controlling the specific composition and micromorphology of cobalt diselenide materials, a cobalt diselenide bifunctional catalyst with greatly improved catalytic activity can be obtained.

Description

Technical field [0001] The invention belongs to the field of new energy materials and electrochemical energy conversion devices, and more specifically, relates to a dual-functional cobalt diselenide material and its preparation and application. The cobalt diselenide material is a dual-functional catalyst and can be used as a dual-functional hydrogen evolution , Application of hydrazine hydrate oxidation catalyst. Background technique [0002] The hydrogen produced by electrolyzed water is cheap, easy to prepare, high in efficiency, high in safety, and environmentally friendly and pollution-free. In order to further reduce the full cell potential required for hydrogen production by electrolysis, an oxidation reaction of hydrazine hydrate was introduced. This kind of dual-function catalyst of aqueous electrolyte has broad application prospects in the fields of environmental protection, catalysis industry and new energy industry. [0003] In the electrolyte containing hydrazine hydr...

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 Patents(China)
IPC IPC(8): B01J27/057B01J35/00C01B19/04C25B11/06C25B1/04
CPCC25B1/04C25B11/04C01B19/04B01J27/0573C01P2004/03C01P2002/72B01J35/33Y02E60/36
Inventor 夏宝玉张俊烨
Owner HUAZHONG UNIV OF SCI & TECH RES INST SHENZHEN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com