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Nickel-iron hydroxide electrocatalyst, preparation method and application, self-powered system and application thereof
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A technology of oxide electricity and catalyst, applied in the direction of electrodes, circuits, energy input, etc., can solve the problems of low activity of oxygen evolution and hydrogen evolution, and achieve the effect of effective utilization and excellent catalytic activity of hydrogen evolution reaction
Active Publication Date: 2021-05-07
BEIJING INST OF NANOENERGY & NANOSYST
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[0004] The purpose of the present invention is to overcome the problems of low oxygen evolution and hydrogen evolution activity of nickel-iron hydroxide electrocatalysts in the prior art, and provide nickel-iron hydroxide electrocatalysts, preparation methods and applications, self-powered systems and applications thereof
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[0042] The first aspect of the present invention provides a kind of preparation method of nickel-iron hydroxide electrocatalyst, wherein, described method comprises the following steps:
[0043] Step 1, dissolving iron salt, fluorine-containing compound and urea in water, and stirring to obtain a homogeneous solution;
[0044] Step 2. Immerse foamed nickel in the homogeneous solution described in step 1, perform hydrothermal reaction, cool and wash with detergent to obtain the nickel-iron hydroxide electrocatalyst.
[0045] In the present invention, the product is analyzed through X-raydiffraction (XRD), showing that the nickel-iron hydroxide electrocatalyst provided by the present invention is in a layered structure, specifically, nickel, iron cations and hydroxide radicals form the main layer, and the interlayer contains Water molecules, carbonate ions and fluoride ions.
[0046] In the present invention, when the nickel-iron hydroxide electrocatalyst is prepared by the meth...
Embodiment 1
[0092] Step 1, with 1.5mmolFe (NO 3 ) 3 9H 2 O (0.021mol / L), 10mmolNH 4F (0.143mol / L) and 12.5mmol urea (0.179mol / L) were dissolved in 70mL of deionized water, stirred for 30 minutes to form a homogeneous solution;
[0093] Step 2. Make a piece with an area of 10cm 2 Nickel foam (2mm×5mm) was immersed in the homogeneous solution, hydrothermally reacted at 120° C. for 6 hours, and cooled naturally to room temperature. The nickel foam was washed several times with deionized water and ethanol, respectively. The catalyst NiFe-OH / NF-1 was prepared, wherein, in the catalyst, the iron content was 14.13wt%, the nickel content was 36.12wt%, the oxygen content was 48.62wt%, and the fluorine content was 1.13wt%.
Embodiment 2
[0095] The same method as in Example 1 was used to prepare the nickel-iron hydroxide electrocatalyst, except that the amount of iron salt was 2mol / L, and the NH 4 The dosage of F is 5mol / L, and the dosage of urea is 4mol / L. The catalyst NiFe-OH / NF-2 was prepared, wherein, in the catalyst, the iron content was 16.21wt%, the nickel content was 34.32wt%, the oxygen content was 47.26wt%, and the fluorine content was 2.21wt%.
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Abstract
The invention relates to the field of electrocatalysts, and discloses a method for preparing nickel-iron hydroxide electrocatalysts. The method comprises the following steps: step 1, dissolving iron salts, fluorine-containing compounds and urea in water, and stirring to obtain a homogeneous solution ; Step 2, impregnating nickel foam in the homogeneous solution described in step 1, performing hydrothermal reaction, cooling and washing with detergent to obtain the nickel-iron hydroxideelectrocatalyst. The electrocatalyst prepared by the method of the present invention has excellent catalytic activity, and the electrocatalyst has excellent hydrogen evolution catalytic activity and oxygen evolution catalytic activity after hydrogen evolution activation or oxygen evolution activation, and can be used in zinc-air batteries and / or In the electrolytic cell, the self-powered system obtained by cooperating with the triboelectric nanogenerator can realize the effective utilization of intermittent renewable energy.
Description
technical field [0001] The invention relates to the field of electrocatalysts, in particular to a nickel-iron hydroxide electrocatalyst, its preparation method and application, a self-energy supplysystem and its application. Background technique [0002] With the development of the global economy, people's demand for energy continues to grow, and most of the current energy comes from fossil fuels, such as coal, oil and natural gas. However, with the continuous exploitation and consumption of fossil fuels, it is inevitable to face problems such as resource depletion and environmental pollution. Therefore, people are prompted to study storage and conversion technologies for clean energy (such as wind energy, solar energy, ocean energy, etc.). [0003] To address the intermittency of these renewable energy sources, hydrogen production via (photo)electrocatalysis has been considered as an effective solution. Traditional electrocatalytic technologies perform water splitting in...
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