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Preparation method of hollow iron selenium derivative catalyst and product and application thereof

A hollow-shaped and derivative technology, which is applied in the field of preparation of hollow-shaped iron-selenium derivative catalysts, can solve problems such as price disadvantage and unsatisfactory electrocatalytic properties such as stability, and achieves low turn-on voltage, good catalytic stability, and improved catalytic performance. The effect of catalytic performance

Active Publication Date: 2019-11-05
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • 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 purpose of the present invention is to provide a preparation method of a hollow iron-selenide derivative catalyst and its product and application, wherein the overall flow process design of the preparation method and key reaction conditions and parameters (such as the type and ratio of the reactants of the hydrothermal reaction, the number of cycle scans used in the electrochemical excitation treatment, etc.) to improve, first use the hydrothermal reaction to obtain the iron-selenium compound with a hollow shape, and then electrochemically synthesize the iron-selenium compound Activation finally obtains iron oxide compound products. Compared with the existing technology, it can effectively solve the technical problems of commercial noble metal oxygen evolution catalysts in terms of price disadvantages and unsatisfactory electrocatalytic properties such as catalytic activity and stability. The preparation method is simple, safe and efficient and controllable

Method used

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  • Preparation method of hollow iron selenium derivative catalyst and product and application thereof
  • Preparation method of hollow iron selenium derivative catalyst and product and application thereof
  • Preparation method of hollow iron selenium derivative catalyst and product and application thereof

Examples

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preparation example Construction

[0032]Aiming at the shortcomings of existing commercial catalysts as catalysts, the purpose of the present invention is to provide a stable oxygen evolution catalyst composed of iron oxide compounds produced by the electrochemical activation of iron-selenium compounds and its preparation method, aiming to solve the problem of existing commercial precious metal production problems. Oxygen catalysts have problems such as low catalytic activity, high price, and poor stability. Generally speaking, the preparation method adopts a one-step hydrothermal method and electrochemical activation to prepare the iron-selenide derivative. The method mainly includes the following steps: 1. The first step of hydrothermal reaction is used to prepare the iron-selenide derivative. Iron selenide precursor; 2. Electrochemical activation treatment, the precursor is activated and converted into iron oxide compound, while its microscopic shape is preserved, so that the oxide has good catalytic activity...

Embodiment 1

[0040] figure 1 Show the preparation process of the iron selenium derivative oxygen evolution catalyst that this example provides, comprise the steps:

[0041] (1) Precursor preparation: Cut a piece of nickel foam with a size of 1cm×2cm, and pass through 6mol L in sequence -1 After washing with hydrochloric acid, deionized water and alcohol, put it into a 60°C oven for drying. Then, dissolve 1mmol ferrous sulfate heptahydrate and 4mmol selenium powder raw materials in 20mL deionized water, then add 3mL hydrazine hydrate and 6mL ammonia water to the mixed solution, and finally immerse the dried nickel foam in the mixed solution, and A 120° C. hydrothermal reaction was performed for 12 hours. Finally, wash and dry to obtain the precursor.

[0042] (2) Preparation of electrode and electrochemical activation of iron-selenide compound: After drying the precursor of iron-selenide compound in an oven set at 60°C for 12 hours, cut out a small piece of 1 square centimeter to obtain ...

Embodiment 2

[0045] (1) Precursor preparation: Cut a piece of nickel foam with a size of 1cm×2cm, and pass through 6mol L in sequence -1 After washing with hydrochloric acid, deionized water and alcohol, put it in a 60°C oven for drying. Next, dissolve 1mmol of ferrous nitrate and 5mmol of selenium powder raw materials in 20mL of deionized water, then add 3mL of hydrazine hydrate and 6mL of ammonia water to the mixed solution, and finally immerse the dried nickel foam in the mixed solution for 12 hours of 120°C hydrothermal reaction. Finally, wash and dry to obtain the precursor.

[0046] (2) Preparation of electrodes and electrochemical activation of iron-selenium compounds: After drying the precursors of iron-selenium compounds at 60° C. for 12 hours, cut out 1 cm2 pieces to obtain electrodes. The electrochemical performance of the catalyst is carried out in a three-electrode test cell, silver or silver chloride is used as a reference electrode, a platinum electrode is used as a counte...

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Abstract

The invention belongs to the field of electrolytic water catalysts, and particularly discloses a preparation method of a hollow iron selenium derivative catalyst and a product and application thereof,wherein the preparation method comprises the following steps: (1) carrying out hydrothermal reaction on a conductive substrate together with a mixed aqueous solution of soluble ferrous salt, seleniumpowder, a reducing agent and an alkaline solution to obtain an iron diselenide precursor; (2) placing a conductive substrate on which the iron diselenide precursor is grown in an alkaline solution asa working electrode, inserting a reference electrode and a counter electrode, electrifying and performing CV scanning to obtain a hollow iron oxide compound on the conductive substrate, wherein the scanning cycle times are not less than 20 times. The method comprises the following steps: firstly, obtaining an iron selenium compound with a hollowed-out shape through hydrothermal reaction; and secondly, electrochemically activating the iron selenium compound to finally obtain an iron oxide compound product. Compared with the prior art, the method can effectively solve the technical problems that commercial noble metal oxygen evolution catalysts are inferior in price and have unsatisfactory electrocatalytic characteristics such as catalytic activity, stability and the like.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemical energy conversion devices, especially the field of electrolytic water catalysts, and more specifically relates to a method for preparing a hollow-shaped iron-selenide derivative catalyst and its product and application. The hollow-shaped iron-selenium derivative catalyst The catalyst is an iron oxide compound derived from an iron selenium compound. Background technique [0002] The water-based electrolyte catalyst has the characteristics of low price, 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 el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/10C25B11/06C25B11/03C25B1/04
CPCB01J23/745C25B11/03C25B1/04C25B11/073B01J35/33Y02E60/36
Inventor 王春栋杨肇希李志山
Owner HUAZHONG UNIV OF SCI & TECH
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