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Ferrocobalt selenide and preparation method and application thereof

A technology of selenide and cobalt iron, which is applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of unsatisfactory electrocatalytic properties such as stability and price disadvantages, and achieve simple preparation methods, The effect of small turn-on voltage and high catalytic activity

Inactive Publication Date: 2018-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a cobalt-iron-selenide, its preparation method and application, which fully combines the characteristics and requirements of the oxygen-generating catalyst in the aqueous electrolyte, and specifically targets the oxygen-generating catalyst. The preparation was redesigned, and the selection, ratio and process parameters of key raw materials were selected and optimized, and a cobalt-iron-selenide oxygen-generating catalyst with greatly improved catalytic activity was obtained accordingly, thus solving the commercial problems of the prior art The price disadvantage of noble metal oxygen generation catalysts and the technical problems of unsatisfactory electrocatalytic properties such as catalytic activity and stability

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  • Ferrocobalt selenide and preparation method and application thereof
  • Ferrocobalt selenide and preparation method and application thereof
  • Ferrocobalt selenide and preparation method and application thereof

Examples

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preparation example Construction

[0032] The invention provides a kind of preparation method of cobalt iron selenide, comprises the steps:

[0033] (1) Put the mixed aqueous solution of soluble cobalt salt, soluble iron salt, soluble ammonium salt and carbon-containing precipitant together with the conductive substrate in a hydrothermal reaction vessel for hydrothermal reaction to obtain nano-sheet-shaped cobalt-ferrite base Formula carbonate precursor; wherein the molar ratio of soluble cobalt salt, soluble iron salt, soluble ammonium salt and carbon-containing precipitant in the mixed aqueous solution is 1:1.5: (1~20): (10~50) , the concentration of the soluble ammonium salt is 0.01-0.3mol / L;

[0034] The conductive substrate is a conductive metal substrate, such as nickel foam, copper foam, etc., preferably nickel foam; the nickel foam can be of various sizes. The carbon-containing precipitant is preferably urea. At the hydrothermal reaction temperature, urea reacts with other raw materials to bind metal a...

Embodiment 1

[0040]figure 1 Show the preparation process of the cobalt iron selenide oxygen production catalyst that this example provides, comprise the steps:

[0041] (1) Precursor preparation: 1 mmol of cobalt nitrate, 1.5 mmol of ferric nitrate, 10 mmol of ammonium fluoride, and 25 mmol of urea raw materials were dissolved in 40 mL of deionized water, and hydrothermally reacted at 120°C for 16 hours. Wash and dry to obtain the precursor.

[0042] (2) Stabilized cobalt-iron-selenium nanosheets: Selenium powder and sodium hydroxide are mixed in a molar ratio of 3.75 mmol: 7.5 mmol, with 0.14 milliliters of hydrazine hydrate (mass fraction 85%) and 50 milliliters of N,N-dimethylformazan The amides are fully mixed, put into the cobalt-iron basic carbonate precursor to carry out two-step hydrothermal selenization reaction, react at 180°C for 1 hour, and obtain the cobalt-iron selenide oxygen generation catalyst after the reaction is dried. figure 2 The scanning electron microscope image o...

Embodiment 2

[0050] (1) Precursor preparation: 1 mmol of cobalt nitrate, 1.5 mmol of ferric nitrate, 10 mmol of ammonium fluoride, and 25 mmol of urea raw materials were dissolved in 40 mL of deionized water, and hydrothermally reacted at 120°C for 16 hours. Wash and dry to obtain the precursor.

[0051] (2) Stable cobalt-iron-selenium nanosheets: Selenium powder and sodium hydroxide are mixed in a molar ratio of 3.75 mmol: 7.5 mmol, with 1 ml of hydrazine hydrate (mass fraction 85%) and 50 ml of N,N-dimethylformazan The amides are fully mixed, and the cobalt-iron basic carbonate precursor is put into a two-step hydrothermal selenization reaction, reacted at 200°C for 6 hours, and the cobalt-iron selenide oxygen generation catalyst is obtained after the reaction is dried.

[0052] (3) Electrode preparation: the cobalt-iron-selenide oxygen-generating catalyst was finally dried at 60° C. for 12 hours, and a small piece of 1 square centimeter was cut out to obtain an electrode. The electroch...

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Abstract

The invention belongs to the field of new energy materials and electrochemical energy conversion devices, and particularly relates to ferrocobalt selenide and a preparation method and application thereof. Ferrocobalt selenide is prepared by means of a two-step hydrothermal method, firstly, a ferrocobalt basic carbonate precursor with a uniform and dense nanosheet shape is prepared by adopting a first-step hydrothermal reaction, and secondly, the precursor is selenized through second-step hydrothermal treatment on the premise of not damaging the uniform and dense nanosheet shape; the preparation method is simple, safe, efficient and controllable. When ferrocobalt selenide is used as an oxygen generating catalyst, since ferrocobalt selenide has a spinel structure, selenized ferrocobalt selenide is a thin nanosheet, more catalytic active sites are exposed, ferrocobalt selenide has high catalytic activity, the starting voltage of the catalyst is low, the overvoltage at a place of 10 mA m<2> is 217 millivolts, and ferrocobalt selenide has electrochemical properties such as lower Tafel slope and good catalytic stability.

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 cobalt iron selenide, its preparation method and application. Background technique [0002] The water-based electrolyte catalyst has the characteristics of cheap price, rapid electrolysis, high efficiency, high stability, high safety factor, environmental protection and no pollution. The catalyst of this water-based electrolyte has broad application prospects in the fields of environmental protection, catalytic industry and new energy industry. [0003] The catalytic mechanism of aqueous electrolyte catalysts is mainly based on the oxidation-reduction reaction at the interface to transport charges and ions to electrolyze water to generate oxygen. In the traditional electrolytic water industry, precious metal catalysts such as iridium dioxide and ruthenium dioxide are mainly used. However, due to their high price ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J37/10C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/0573B01J37/10B01J35/33Y02E60/36
Inventor 王春栋张俊烨江建军
Owner HUAZHONG UNIV OF SCI & TECH
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