Hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode and preparation method and application thereof

A technology of iron oxyhydroxide and oxygen evolution electrode, which is applied in the direction of electrodes, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., and can solve the problems that cannot be overcome by catalysts and affect the long-term operation life of the full electrolytic cell, corrosion etc. to achieve good catalytic activity and stability, good performance and simple process

Inactive Publication Date: 2018-01-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst has good electrocatalytic activity for oxygen evolution under alkaline conditions, the catalyst still has its insurmountable shortcomings
The supported catalyst with carbon material as the carrier is severely corroded under the electrolysis voltage of the alkaline full electrolytic cell test, which affects the long-term operation life of the full electrolytic cell

Method used

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  • Hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode and preparation method and application thereof
  • Hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode and preparation method and application thereof
  • Hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] preparation:

[0034] (1) Mixing of precursor solution: with 0.261g nickel nitrate, 0.5g iron nitrate as raw material, 0.2g urea as alkali source; 1.5g polyethylene glycol as surfactant; 0.2g ammonium fluoride as complexing agent; Dissolve in 40mL deionized water and stir for 30min;

[0035] (2) Hydrothermal reaction: Transfer the solution of (1) to a 50mL hydrothermal reaction kettle with a nickel foam base, and conduct a hydrothermal reaction at 120°C in a blast drying oven for 5 hours. The hydrothermal kettle is cooled with the furnace to prepare Get dark green nickel foam. Washing with deionized water for 3 to 5 times, and drying in vacuum at 60°C for 8 hours to prepare an integrated oxygen evolution electrode of iron oxyhydroxide / nickel-iron hydrotalcite (FeOOH / NiFe LDHs).

[0036] Depend on figure 1 It can be seen that the integrated electrode with uniform size, good dispersion, 0.5-8 μm high, 10-50 nm thick vertical and intersecting nanosheet layers loaded on ...

Embodiment 2

[0039] The iron hydroxide integrated electrode was prepared according to the same preparation steps as in Example 1, the amount of nickel nitrate in the precursor was 0.7 g, and the test conditions were the same as in Example 1.

[0040] Half-cell test: The half-cell system uses 1M KOH solution saturated with oxygen as the electrolyte, and the integrated electrode performs LSV scanning, such as figure 2 , 3 shown. The integrated electrode prepared by this method is 100mA / cm in 1M KOH electrolyte solution 2 The potential under the electrolysis current density is 1.594V (vs.RHE).

Embodiment 3

[0042] The nickel hydroxide integrated electrode was prepared according to the same preparation steps as in Example 1, the amount of nickel nitrate in the precursor was 0.8 g, and the test conditions were the same as in Example 1.

[0043] Half-cell test: The half-cell system uses 1M KOH solution saturated with oxygen as the electrolyte, and the integrated electrode performs LSV scanning, such as figure 2 , 3 shown. The integrated electrode prepared by this method is 100mA / cm in 1M KOH electrolyte solution 2 The potential at the electrolysis current density is 1.678V (vs.RHE).

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Abstract

The invention relates to a hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode applicable to alkaline mediums and a preparation method and application thereof. The electrode is applicable to the oxygen evolution reaction in the water-electrolytic hydrogen making process under catalytic alkaline conditions. The hydroxyl oxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode and the preparation method and application thereof have the advantages as follows: the nickel-iron hydroxide integrated electrode is shape-controlled, the preparation process is simple and under mild conditions, and the electrode can be used for a water electrolytic tank for hydrogen production from water splitting under external bias potentials; the prepared hydroxyloxidize iron-nickel-iron hydrotalcite integrated oxygen evolution electrode further has a better performance when being used in an alkaline solid polymer electrolyte (AEM) water electrolytic tank; and besides, an extensive utilization value in achieved in regenerative fuel cells (RFC), photoelectro-catalytic devices and electrolytic hydrogen generators.

Description

technical field [0001] The invention relates to a method for preparing an integrated electrode of iron oxyhydroxide / nickel-iron hydrotalcite (FeOOH / NiFe LDHs) for alkaline electrolysis of water. Upright, intersecting nanosheet-like layers of 2-3 μm high and 25-35 nm thick are supported. The finally obtained integrated electrode can be used as an oxygen evolution electrode used under alkaline conditions, and can be applied in AEM water electrolysis, RFC or various electrolysis devices. Background technique [0002] Water electrolysis offers a clean conversion route from water to hydrogen. If renewable energy is used to produce electricity for electrolysis of water, CO2 can be truly realized. 2 zero emissions. The purity of hydrogen obtained in this way is very high, which can reach more than 99.9%. It is an ideal source of raw gas for the manufacturing industry of precision electronic devices that requires high-purity hydrogen. Hydrogen production technology by electrolys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06B01J23/755
CPCY02E60/36
Inventor 俞红梅迟军付丽覃博文贾佳邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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