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Oxygen evolution reaction FeOOH/Co(OH)2 composite electrocatalyst preparation method

An oxygen evolution reaction and electrocatalyst technology, applied in electrodes, circuits, electrical components, etc., can solve the problems of poor dispersion and poor electrocatalytic performance of oxygen evolution reaction, and achieve convenient operation, improved electrocatalytic performance, and high electrocatalytic performance. and electrochemical stability

Inactive Publication Date: 2019-04-16
HEBEI UNIV OF TECH
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Problems solved by technology

[0003] The object of the present invention is to aim at pure phase Co(OH) 2 The electrocatalytic performance of the oxygen evolution reaction is poor, and the traditional preparation method has poor dispersion. It provides a simple and feasible preparation method for the preparation of iron oxyhydroxide / cobalt hydroxide composite oxygen evolution reaction electrocatalyst, which greatly improves its catalytic performance.

Method used

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  • Oxygen evolution reaction FeOOH/Co(OH)2 composite electrocatalyst preparation method
  • Oxygen evolution reaction FeOOH/Co(OH)2 composite electrocatalyst preparation method
  • Oxygen evolution reaction FeOOH/Co(OH)2 composite electrocatalyst preparation method

Examples

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Embodiment 1

[0032] Step 1: Dissolve an appropriate amount of cobalt nitrate in a certain volume of deionized water, stir at 25°C for 15 minutes, and use the prepared cobalt nitrate solution (0.1mol / L) as the electrolyte;

[0033]Step 2: Cut carbon fiber paper with a thickness of 0.3mm into 1*2cm long strips and heat in a water bath at 60°C for 2 hours in a 1mol / L potassium hydroxide solution, then ultrasonically in absolute ethanol and deionized water for 30 minutes, take out Finally, dry in an oven at 60°C for 3 hours;

[0034] Step 3: Use the electrode holder to clamp the carbon fiber paper treated in step 2 as the working electrode, the platinum-coated titanium mesh (2*3cm) as the counter electrode, the saturated calomel electrode as the reference electrode, and the cobalt nitrate solution in step 1 as the electrolyte , carry out step-by-step constant voltage deposition; the first deposition voltage is -1.1V, the deposition time is 100s, and then the second step deposition is performed...

Embodiment 2

[0041] Other steps are the same as in Example 1, except that the number of deposition circles in step 3 is changed from 1 circle to 2 circles.

Embodiment 3

[0043] Other steps are the same as in Example 1, except that the number of deposition circles in step 3 is changed from 1 circle to 3 circles.

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Abstract

The invention relates to an oxygen evolution reaction FeOOH / Co(OH)2 composite electrocatalyst preparation method. The method adopts cobalt nitrate and ferric nitrate as raw materials to prepare a deposition electrolyte. Constant voltage potential layered deposition is used, and the deposition principle is that cathodic reduction of nitrate to a hydroxide ion is carried out, hydroxide precipitationis formed with a transition metal ion on the surface of a substrate, L-alanine is added to a nitrate electrolyte, and the electrostatic interaction between amphoteric terminal groups and anions and cations in a transition metal salt solution can effectively form nanoparticle growth on substrate carbon fibers during the electrodeposition process. The FeOOH / Co(OH)2 composite electrocatalyst prepared by the invention has high electrocatalytic performance and electrochemical stability, and can be used as an electrocatalytic material in an oxygen evolution reaction in the fields such as development of metal-air cells and clean energy.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, more specifically, it is a method of in-situ layered growth of FeOOH composite Co(OH) on carbon fiber paper using step-by-step electrochemical deposition technology. 2 Preparation and application as electrocatalyst for oxygen evolution reaction. Background technique [0002] The current electrocatalytic materials for oxygen evolution reaction are based on noble metal oxides such as iridium dioxide (IrO 2 ) or ruthenium dioxide (RuO 2 ) mainly, although they have high catalytic performance, they are expensive, scarce resources, high synthesis cost, poor stability in the catalytic process, and easy to dissolve under acidic or alkaline reaction conditions. Therefore, the development and application of non-noble metal oxides, especially transition metal oxides, as electrocatalysts for the oxygen evolution reaction has attracted extensive attention and research by researchers. Co(O...

Claims

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Application Information

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IPC IPC(8): H01M4/90C25B1/04C25B11/04C25D9/04
CPCC25B1/04C25D9/04C25B11/091H01M4/9016Y02E60/36Y02E60/50
Inventor 张兴华冀雪峰臧泽毫李兰兰卢遵铭刘辉
Owner HEBEI UNIV OF TECH
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