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Ni-Fe catalyst, and preparation method and application thereof

A catalyst, ni-fe technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high production cost of electrocatalysts, difficult long-term high-efficiency electrolysis , the problem of high overpotential, to achieve the effect of being beneficial to industrial application, the preparation method is simple and efficient, and the performance is excellent

Active Publication Date: 2020-08-25
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high production cost of existing electrocatalysts, high overpotential, difficulty in long-term high-efficiency electrolysis, etc., and provide a high-efficiency electrolytic water catalyst and a fast, efficient and cheap preparation method

Method used

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  • Ni-Fe catalyst, and preparation method and application thereof
  • Ni-Fe catalyst, and preparation method and application thereof
  • Ni-Fe catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of preparation method of Ni-Fe catalyst, and concrete steps are as follows:

[0028] Step 1: Cut the nickel foam substrate and carbon paper into 0.5cm×3.0cm, wash them with acetone, ethanol, and deionized water for 30 minutes, and dry them at 60°C for later use.

[0029] Step 2: Prepare ferric nitrate and nickel nitrate solutions of 309mmol / L respectively for later use.

[0030] Step 3: Add 0.7ml of the ferric nitrate and nickel nitrate solutions of the above concentrations into 100ml of ethylene glycol, and then add 0.7ml of deionized water and 0.11g of ammonium fluoride; ultrasonicate for a while to form a uniform solution.

[0031] Step 4: Use clean nickel foam as the cathode, and carbon paper as the anode, the two are parallel to each other about 2cm apart, and the working area is 2.0cm×0.5cm. Put it into the precursor solution that has been preheated to 40°C, and let it stand for a while.

[0032] Step 5: Keep the cathode an...

Embodiment 2

[0040] Example 1 was repeated.

[0041] The results show that the current density of electrolyzing water to produce oxygen reaches 10mA / cm 2 The overpotential is 230mV, 100mA / cm 2 The overpotential is 266mV, 300mA / cm 2 The overpotential of 289mV.

Embodiment 3

[0043] Example 1 was repeated.

[0044] The results show that the current density of electrolyzing water to produce oxygen reaches 10mA / cm 2 The overpotential is 223mV, 100mA / cm 2 The overpotential is 255mV, 300mA / cm 2 The overpotential of 261mV.

[0045] Examples 2 and 3 show that the method has good repeatability.

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Abstract

The invention discloses a preparation method of a Ni-Fe catalyst. The preparation method comprises the following steps: 1, cutting a foamed nickel substrate and carbon paper, cleaning the foamed nickel substrate and the carbon paper with acetone, ethanol and deionized water in sequence, and conducting drying for later use; 2, respectively preparing a ferric nitrate solution and a nickel nitrate solution for later use; 3, respectively adding the ferric nitrate solution and the nickel nitrate solution in the step 2 into ethylene glycol, then adding deionized water and ammonium fluoride, and carrying out ultrasonic dispersion to form a uniform precursor solution; 4, taking clean foamed nickel as a cathode and carbon paper as an anode, putting the cathode and the anode into the precursor solution having been preheated to 40 DEG C, and conducting standing; step 5, keeping the cathode and the anode fixed, applying voltage to two ends by using a voltage-stabilized power supply, and maintaining the voltage for 5 minutes; and step 6, taking down foamed nickel deposited with a black catalyst, soaking the foamed nickel in absolute ethyl alcohol for cleaning, taking out the foamed nickel, anddrying the foamed nickel to obtain the NiFe catalyst. The prepared NiFe catalyst is excellent in water electrolysis performance, simple in preparation method and low in cost, and has excellent industrialization prospects.

Description

technical field [0001] The invention relates to a Ni-Fe-based catalyst with high-efficiency electrolysis of water, a preparation method and application thereof. Background technique [0002] Electrocatalytic oxidation of water (OER) is a crucial reaction in the field of electrochemistry. It is the anode reaction of electrolyzing water to produce hydrogen, electrochemically reducing carbon dioxide to produce hydrocarbons, and electrochemically reducing nitrogen to synthesize ammonia. The noble metal catalyst represented by IrO2 is considered to be the best oxygen evolution reaction catalyst, but it is expensive and has poor stability in alkaline environment, which is not enough to work stably for a long time under high current electrolysis conditions. In addition, since OER is a four-electron process, the kinetics are slow and the overpotential is high. Therefore, factors such as energy consumption, production efficiency, and cost limit the wide application of such catalyst...

Claims

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Application Information

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IPC IPC(8): B01J23/755C25D3/56C25B1/04C25B11/03C25B11/06
CPCB01J23/755C25D3/562C25B1/04C25B11/031C25B11/051C25B11/057C25B11/091B01J35/33Y02E60/36
Inventor 林柏霖钱瑶肖彦军唐和华
Owner SHANGHAI TECH UNIV
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