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Preparation method of iron-doped nickel based composite for electrochemical oxygen evolution

A composite material and iron-doped technology, which is applied in the field of preparation of catalytic materials, can solve the problems of high raw material cost, long production cycle, unfavorable industrial production, etc., and achieve the effect of high catalytic activity and short production cycle

Active Publication Date: 2017-06-27
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the reports in recent years, it is not difficult to see that although more and more electrochemical oxygen evolution catalytic materials have been developed and reported, the shortcomings are: due to the high cost of raw materials and complicated preparation processes involved in the preparation technology / method, The production cycle is long, which leads to high overall cost of materials and low efficiency, which is not conducive to industrial production

Method used

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  • Preparation method of iron-doped nickel based composite for electrochemical oxygen evolution
  • Preparation method of iron-doped nickel based composite for electrochemical oxygen evolution

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, the metal foam nickel substrate is cleaned with deionized water and ethanol respectively to remove dust and oil to obtain a clean nickel surface; secondly, prepare a KOH alkaline electrolyte with a KOH concentration of 300g / L; then, the cleaned nickel The electrode is immersed in the KOH electrolyte as the working electrode, and another metal iron electrode with the same area is added to the alkaline electrolyte as the counter electrode. Among them, the metal nickel electrode is used to provide the nickel element required for material preparation, and the metal iron electrode is used to provide the trace iron element required for material preparation. Electrochemical cyclic voltammetry (scanning rate: 100mV / s, scanning voltage window range of 0-2.5V) cyclically polarizes the nickel electrode for 12 hours, and a layer of iron-doped nickel base can be obtained on the surface of the nickel base. compound composites.

[0019] like figure 1 As shown, it can be seen ...

Embodiment 2

[0022] Firstly, the metal nickel substrate is cleaned with deionized water and ethanol respectively to remove dust and oil to obtain a clean nickel surface; secondly, NaOH alkaline electrolyte is prepared with a NaOH concentration of 250g / L; then, the cleaned nickel The electrode is immersed in the NaOH electrolyte as the working electrode, and another nickel sheet electrode with the same area is added to the alkaline electrolyte as the counter electrode, and 5g of iron powder is added to the electrolyte. Among them, the metal nickel electrode is used to provide The nickel element required for material preparation, and metal iron powder are used to provide the trace iron element required for material preparation. The nickel electrode is cyclically polarized for 24 hours by pulse voltage step technology (pulse width: 50s, high voltage 2.5V, low voltage 0.5V), and a layer of iron-doped nickel-based compound composite material can be obtained on the surface of the nickel substrate...

Embodiment 3

[0024] First, the metal foam nickel substrate was cleaned with deionized water and ethanol to remove dust and oil to obtain a clean nickel surface; secondly, LiOH alkaline electrolyte was prepared with a LiOH concentration of 100g / L; then, the cleaned nickel The electrode is immersed in the LiOH electrolyte as the working electrode. At the same time, another nickel foam electrode with the same area is added to the alkaline electrolyte as the counter electrode. Then, 10g of iron hydroxide powder is added to the electrolyte. Among them, the metal nickel electrode It is used to provide the nickel element required for material preparation, and the iron hydroxide powder is used to provide the trace iron element required for material preparation. A layer of iron-doped nickel-based compound composite material can be obtained on the surface of the nickel substrate by cyclically polarizing the nickel electrode for 6 hours by constant voltage step technology (high voltage 2.0V, low volta...

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Abstract

The invention discloses a preparation method of an iron-doped nickel based composite for electrochemical oxygen evolution. The method mainly comprises the steps that the surface of a metallic nickel substrate is cleaned, an alkaline electrolyte is prepared, the concentration of metallic alkaline compounds is 100-300 g / L, and the pH value is controlled to be higher than 14; then the cleaned nickel substrate is used as a working electrode to be soaked in the alkaline electrolyte, a metallic iron electrode with the same area is used as a counter electrode and is added into the alkaline electrolyte with the nickel substrate, and excess iron elements are added into the alkaline electrolyte at the same time; and finally, the surface of the nickel electrode is subjected to cyclic polarization for 1-24 hours through an electrochemical technology, and then the iron-doped nickel based compound composite on the surface of the nickel substrate can be obtained. The method is low in raw material cost, simple in process, easy to operate, low in production cost and short in production cycle, has the high electrochemical oxygen evolution catalytic activity and is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a method for preparing a catalytic material, in particular to a method for preparing an iron-doped nickel-based composite material. Background technique [0002] With the continuous reduction of fossil fuel resources, the demand for renewable and clean energy in social development has become more and more urgent, so the development of clean energy technology has become one of the hotspots of research at home and abroad. Among them, hydrogen production by electrolysis of water is one of the most effective means to obtain renewable hydrogen energy. As we all know, the process of hydrogen production by electrolysis of water mainly involves the precipitation reactions of hydrogen and oxygen on the positive and negative electrodes, respectively. Although the theoretical decomposition voltage of water is only 1.229V, the actual voltage of electrolyzed water is as high as 1.8-2.5V due to the polarization caused by the sluggish electr...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/091Y02E60/36
Inventor 樊玉欠王慧娟李子轩张文波王璐萌曾磊余文婷蒋天航马志鹏
Owner YANSHAN UNIV
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