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Difunctional cobalt diselenide material as well as preparation method and application thereof

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

Active Publication Date: 2018-09-21
HUAZHONG UNIV OF SCI & TECH RES INST SHENZHEN +1
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  • Abstract
  • Description
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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

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  • Difunctional cobalt diselenide material as well as preparation method and application thereof
  • Difunctional cobalt diselenide material as well as preparation method and application thereof
  • Difunctional cobalt diselenide material as well as preparation method and application thereof

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preparation example Construction

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

[0034] (1) Place a mixed aqueous solution of soluble cobalt salt, soluble ammonium salt and carbon-containing precipitant together with a 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 hydrothermal reaction temperature, urea reacts with other raw materials to combine metal atoms after...

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 a two-step hydrothermal selenization reaction, react at 180°C for 1 hour, and obtain a 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. i...

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 a two-step hydrothermal selenization reaction, react at 180°C for 1 hour, and obtain a 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, th...

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Abstract

The invention discloses a difunctional cobalt diselenide material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) jointly performingthe hydrothermal reaction for a mixed aqueous solution of soluble cobalt salt, soluble ammonium salt and a carbon-containing precipitant and a conducting substrate, and obtaining a cobalt element-containing precursor growing on the conducting substrate; (2) jointly performing the hydrothermal selenylation reaction for a mixed solution of selenium powder, alkali, a reduction agent and organic solvent and the cobalt element-containing precursor in step (1), after the reaction is ended, drying, and obtaining the cobalt diselenide material. By combining the oxidation of hydrazine hydrate and the specific application of a hydrogen evolution catalyst, the preparation of the cobalt diselenide material is re-designed; and specifically by designing the overall process of the preparation method andselecting and optimizing parameter conditions adopted in each step and by optimally controlling the specific composition and microscopic morphology of the cobalt diselenide material, the cobalt diselenide bifunctional catalyst with greatly-improved catalytic activity can be correspondingly 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

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Application Information

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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
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