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A kind of layered double metal hydroxide and its preparation method and application

A layered bimetallic and hydroxide technology, applied in the field of materials, can solve the problems of structural deformation, difficulty in obtaining NiIr layered bimetallic hydroxide, affecting the stability of the layered structure, etc., and achieves scientific, reasonable and excellent reaction conditions. The catalytic activity of seawater electrolysis and the effect of abundant and readily available raw materials

Active Publication Date: 2022-02-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When Ir atoms are doped into the main structure of Ni-based layered hydroxides, it is easy to cause structural deformation and affect the stability of the layered structure during the synthesis process, making it difficult to obtain NiIr layered double hydroxides.

Method used

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  • A kind of layered double metal hydroxide and its preparation method and application
  • A kind of layered double metal hydroxide and its preparation method and application
  • A kind of layered double metal hydroxide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A kind of preparation of NiIr layered double metal hydroxide:

[0067] (1) Configure the following solutions respectively:

[0068] Solution I is a Ni salt solution: 75mM Ni(NO 3 ) 2 ·6H 2 Aqueous solution of O;

[0069] Solution II is Ir salt solution: 25mM IrCl 3 ·3H 2 Aqueous solution of O:

[0070] Solution III: 23 wt% formamide in water;

[0071] pH adjuster solution: 0.25M NaOH aqueous solution;

[0072] (2) Take 20ml of solution III and add it to a three-necked flask and raise the temperature to 80°C and adjust the pH to 10 with a pH regulator solution;

[0073] (3) Take 5ml of solution I and 5ml of solution II respectively, mix well, add dropwise into the flask with a syringe pump, the injection time is 10min, and use the pH regulator solution to maintain the pH between 9-10 during the addition process ;

[0074] (4) Stop heating immediately after adding solution I and solution II, and cool to room temperature naturally;

[0075] (5) Washing with a mi...

Embodiment 2-3

[0077] A kind of preparation method of NiIr layered double metal hydroxide:

[0078] Except as shown in Table 1, other steps are the same as in Example 1.

[0079] The difference of the preparation method of table 1 embodiment 2-3 and embodiment 1

[0080] project Example 2 Example 3 Solution I Ni source concentration 37.5mM 84mM Solution II Ir source concentration 12.5mM 28mM Molar ratio of Ni source to Ir source 3:1 3:1 Concentration of formamide in solution III 10wt% 40wt% Dropping rate of solution I and solution mixture 1ml / min 0.5ml / min temperature reflex 60℃ 85℃ product tagged as S2-NiIr-LDH S3-NiIr-LDH

Embodiment 4

[0099] Electrocatalytic oxygen evolution performance test (the scanning range is selected with reference to the standard hydrogen electrode):

[0100] (1) Preparation of electrodes: Electrochemical tests were performed in a three-electrode glass electrolytic cell. The working electrode is to take a certain amount of catalyst (respectively S1-NiIr-LDH, D1-NiFe-LDH, D2-IrO 2 ) was dispersed in 1ml of isopropanol, and then 20ml of nafion was added for ultrasound. Then take 100 μL of the above mixed solution and drop it on the nickel foam (area 1cm 2 ), prepared by drying, the platinum mesh is the counter electrode, and the reference electrode is Ag / AgCl. The content loaded in the catalyst of nickel foam is 1mg / cm 2 .

[0101] (2) Electrochemical performance test: first in N 2 Cyclic voltammetry scanning was carried out in 1M KOH solution under the atmosphere, and the scanning speed was 100mV s -1 , the scanning range is 0-1.2V, and the number of scanning circles is 10 circl...

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Abstract

The application provides a layered double metal hydroxide and its preparation method and application. The layered double metal hydroxide is a NiIr layered double metal hydroxide. The layered double metal hydroxide has excellent seawater electrolysis catalytic activity, selectivity and stability.

Description

technical field [0001] The application relates to a layered double metal hydroxide and its preparation method and application, belonging to the field of materials. Background technique [0002] Hydrogen is an efficient and clean energy. Compared with other methods (such as water gas to obtain hydrogen and carbon monoxide mixed gas, etc.), the electrolysis of water to produce hydrogen can obtain hydrogen with higher purity and higher efficiency. [0003] However, most of the current research on electrolysis of water mainly uses pure water as the electrolyte, and the scarcity of water resources often becomes the main bottleneck restricting the application of pure water electrolysis. Therefore, the use of seawater for electrolysis has become a more promising means of hydrogen production, and the development and research of seawater electrolysis is still blank. [0004] Compared with pure water, seawater contains many impurity ions, which will seriously corrode the electrolyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/093C25B1/04
CPCC25B1/04Y02E60/36
Inventor 曹荣曹敏纳游晗晖
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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