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Nickel-based self-supporting water electrolysis catalyst and preparation method thereof

A catalyst, self-supporting technology, applied in the field of electrocatalysis, can solve the problems of limited electrocatalytic performance, poor conductivity of hydroxide, large polarization, etc., to achieve controllable product morphology, lower energy barrier, and low cost. Effect

Pending Publication Date: 2022-02-15
张黎丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hydroxide has the problem of poor conductivity, which will generate large polarization during the electrocatalytic reaction, thus limiting its electrocatalytic performance.

Method used

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  • Nickel-based self-supporting water electrolysis catalyst and preparation method thereof
  • Nickel-based self-supporting water electrolysis catalyst and preparation method thereof
  • Nickel-based self-supporting water electrolysis catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A nickel-based self-supporting electrolytic water catalyst, the preparation process of which comprises the following steps:

[0028] (1) 0.582g Ni(NO 3 ) 2 ·6H 2 O, 0.26g Ce(NO 3 ) 3 ·6H 2 O, 0.37g ammonium fluoride, 0.6g urea (all chemical reagents were purchased from Aladdin Ltd (China)) were dissolved in 24mL deionized water to obtain a mixed solution, which was then transferred to a 50mL autoclave liner after magnetic stirring for 30min. Then put a 2cm×2cm clean carbon cloth (Carbon Cloth, CC, thickness 0.33mm, purchased from CeTech Co., Ltd., model WOS1009) after being treated with acetone, ethanol and deionized water and dried into the above solution middle. Seal the liner and put it into a stainless steel autoclave, set up an electric heating constant temperature blast drying oven (DHG-9036A) and react at 120°C for 6 hours to obtain Ni(OH) 2 / CeO 2 / CC composites were rinsed repeatedly with deionized water and dried in a vacuum oven (DZF-6020) for later u...

experiment example 1

[0039] Characterization of Physicochemical Properties of Nickel-Based Self-supporting Catalysts for Electrolysis of Water

[0040] The nickel-based self-supporting electrolytic water catalyst obtained in Example 1 of the present invention is systematically studied on its composition, chemical bond, morphology and microstructure by modern nano-testing and analysis techniques such as XRD, XPS, SEM, and TEM, and the results are as follows:

[0041] First the product that embodiment 1 obtains carries out XRD characterization ( figure 1 a), and compare the XRD pattern with NiO, CeO 2 Standard card correspondence. The result shows that the product that embodiment 1 obtains contains NiO, CeO 2 Characteristic peaks, proving that the final product is NiO and CeO supported on carbon cloth 2 composite material. For determining the chemical bonding state of each element in the product, the product that embodiment 1 obtains has carried out XPS analysis ( figure 1 b-1d), XPS spectrogra...

experiment example 2

[0044] The products obtained in Example 1 and Comparative Examples 1 to 2 were used as catalysts to carry out electrolysis water hydrogen evolution and oxygen evolution tests respectively in a solution with electrolyte 1.0M KOH. The electrochemical measurement is carried out on an electrochemical workstation (CHI660E), using a standard three-electrode system, wherein the Hg / HgO electrode is the reference electrode, and the graphite electrode is the counter electrode. The products prepared in Example 1 of the present invention and Comparative Examples 1 to 2 are Working electrode (geometric area 1cm×1cm). Linear Sweep Voltammetry (LSV) at N 2 5mVs in saturated electrolyte -1 The scan rate is measured, Equation E vs.RHE =E vs.Hg / HgO +0.059*pH+0.098 Calculated potential vs. potential of the reversible hydrogen electrode (RHE). At a current density of 10mA cm -2 Under the condition of , the electrochemical stability was tested by chronopotentiometry curve.

[0045] The resul...

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Abstract

The invention discloses a nickel-based self-supporting water electrolysis catalyst. According to the catalyst, a NiO / CeO2 nano sheet array is loaded on flexible carbon cloth to form a three-dimensional self-supporting stable structure. Nickel oxide overcomes the problem of poor conductivity of the material, can reduce the polarization phenomenon in the electro-catalysis process, and reduces the energy potential barrier of the reaction. Oxygen vacancies in cerium oxide can provide more active sites for the reaction, so that the adsorption of reaction intermediates is facilitated. Cerium oxide has more effective different-phase nano junction interfaces, and generates a synergistic effect and an interface effect with nickel oxide, so that active sites in the catalytic process are increased, and the catalytic performance is improved. The three-dimensional self-supporting structure of the catalyst also obviously improves the catalytic stability. The invention also discloses a preparation method of the catalyst, and the preparation method has the advantages of simple synthesis steps and controllable product morphology, is suitable for industrial popularization, and has certain large-scale application prospects.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and relates to a nickel-based self-supporting electrolytic water catalyst and a preparation method thereof. Background technique [0002] With the depletion of traditional fossil energy and the increasingly urgent need for large-scale energy storage, hydrogen energy, as a renewable energy with clean combustion products, is currently the object of vigorous development in order to supplement or replace fossil energy. Water electrolysis has attracted much attention as a technology that can convert unsustainable energy into clean energy. [0003] The process of electrolyzing water can be regarded as two half-reactions of cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER). Although the theoretical decomposition voltage of water is 1.23V, due to the electrode resistance, electrolyte resistance, etc. Due to factors such as the voltage drop generated and the overpotenti...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B11/054C25B1/04
CPCC25B11/091C25B11/054C25B1/04Y02E60/36Y02P20/133
Inventor 张黎丽
Owner 张黎丽
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