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Preparation method of acid-etched Ni, Co, Fe ternary metal hydroxide oxygen evolution catalyst

A ternary metal and hydroxide technology, applied in the field of Fe ternary metal hydroxide oxygen evolution catalyst, Co, and Ni involving acid etching, can solve problems such as unreported methods, and achieve simple and easy-to-implement process, process The effect of good repeatability, easy scale-up and industrial production

Inactive Publication Date: 2019-12-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the method of Ni, Co, Fe ternary metal hydroxides by acid etching has not been reported

Method used

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  • Preparation method of acid-etched Ni, Co, Fe ternary metal hydroxide oxygen evolution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take by weighing 5.463g nickel nitrate (H 12 N 2 NiO 12 ) and 2.517g ferric nitrate (H 18 FeN 3 o 18 ) and 0.604g cobalt nitrate (CoH 12 N 2 o 12 ) was dissolved in 30mL deionized water, 2.304g sodium hydroxide (NaOH) and 2.544g sodium carbonate (NaOH) 2 CO 3 ) was dissolved in 30 mL of deionized water, and then the two solutions were mixed and stirred vigorously, and reacted under hydrothermal conditions at 80°C for 48h, and the obtained precipitate was centrifuged and dried at 60°C for 24h to obtain the desired precursor. Weigh 200 mg of the precursor, dissolve it in deionized water and stir thoroughly, and add 2.0 mL of -1 nitric acid, stirred at room temperature for 30 min, washed by centrifugation, and dried at 60°C for 24 h. The acid-etched Ni, Co, Fe ternary metal hydroxide high-performance oxygen evolution catalyst is obtained. Electrochemical tests show that its current density reaches 10mA cm -2 , the overpotential is only 184mV, and the Tafel slop...

Embodiment 2

[0016] Take by weighing 5.463g nickel nitrate (H 12 N 2 NiO 12 ) and 2.517g ferric nitrate (H 18 FeN 3 o 18 ) and 0.604g cobalt nitrate (CoH 12 N 2 o 12 ) was dissolved in 30mL deionized water, 2.304g sodium hydroxide (NaOH) and 2.544g sodium carbonate (NaOH) 2 CO 3 ) was dissolved in 30 mL of deionized water, and then the two solutions were mixed vigorously and stirred at 80 ° C for 48 h, and the obtained precipitate was centrifuged and dried at 60 ° C for 24 h to obtain the desired precursor. Weigh 200 mg of the precursor, dissolve it in deionized water and stir thoroughly, and add 1.0 mL of -1 nitric acid, stirred at room temperature for 30 min, washed by centrifugation, and dried at 60°C for 24 h. The acid-etched Ni, Co, Fe ternary metal hydroxide high-performance oxygen evolution catalyst is obtained. Electrochemical tests show that its current density reaches 10mA cm -2 , the overpotential is only 184mV, and the Tafel slope is relatively small at 37.8mV·dec ...

Embodiment 3

[0018] Take by weighing 5.463g nickel nitrate (H 12 N 2 NiO 12 ) and 2.517g ferric nitrate (H 18 FeN 3 o 18 ) and 0.604g cobalt nitrate (CoH 12 N 2 o 12 ) was dissolved in 30mL deionized water, 2.304g sodium hydroxide (NaOH) and 2.544g sodium carbonate (NaOH) 2 CO 3 ) was dissolved in 30 mL of deionized water, and then the two solutions were mixed vigorously and stirred at 80 ° C for 48 h, and the obtained precipitate was centrifuged and dried at 60 ° C for 24 h to obtain the desired precursor. Weigh 200 mg of the precursor, dissolve it in deionized water and stir thoroughly, and add 2.0 mL of -1 nitric acid, stirred at room temperature for 30 min, washed by centrifugation, and dried at 60°C for 24 h. The acid-etched Ni, Co, Fe ternary metal hydroxide high-performance oxygen evolution catalyst is obtained. Electrochemical tests show that its current density reaches 10mA cm -2 , the overpotential is only 184mV, and the Tafel slope is relatively small at 37.8mV·dec ...

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Abstract

The invention relates to a preparation method of an acid-etched Ni, Co, Fe ternary metal hydroxide high-performance oxygen evolution catalyst, and specifically relates to a method that firstly a precursor is synthesized by using a hydrothermal method, and then the precursor is converted into the Ni, Co, Fe ternary metal hydroxide electro-catalyst with a relatively large specific surface area, moreactive sites, a nanosheet structure, and a large number of vacancies by an acid etching method. The acid-etched Ni, Co, Fe ternary metal hydroxide high-performance catalyst with the nanosheet structure and a large number of vacancies has the advantages of high reactivity, good electrical conductivity, high stability under alkaline conditions, and the like. The preparation method of the material is simple and easy, equipment is simple, the price of raw materials is low, and repeatability is good.

Description

technical field [0001] The present invention relates to the preparation method of acid-etched Ni, Co, Fe ternary metal hydroxide oxygen evolution catalyst, in particular to a method of synthesizing a precursor by hydrothermal method, and then transforming the precursor into nano Sheet structure and Ni, Co, Fe ternary metal hydroxide catalyst with a large number of vacancies, the obtained catalyst has the advantages of high oxygen evolution activity, good conductivity, and high stability under alkaline conditions. Background technique [0002] High-efficiency catalysts with large specific surface area and many exposed active sites are materials that can reduce overpotential. They have important applications in fuel cells, solar cells, metal-air batteries, and the production of clean hydrogen fuels. [0003] It is well known that noble metal-based catalysts are the most effective OER catalysts, but their development and wide application are greatly restricted due to their sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/10B01J37/06B01J37/03B82Y30/00B82Y40/00H01M4/90C25B11/06C25B1/04
CPCB01J23/755B01J37/10B01J37/06B01J37/031B82Y30/00B82Y40/00H01M4/9016C25B11/04C25B1/04B01J35/33Y02E60/36Y02E60/50
Inventor 郭志岩王友配李明王思清杜芳林
Owner QINGDAO UNIV OF SCI & TECH
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