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Multi-stage structure electrode for electrolyzing water, and preparation method of multi-stage structure electrode

A technology of electrolyzing water and electrodes, which is applied in the field of materials, can solve the problems of poor product stability, high cost, and high stability, and achieve the effects of stable performance, low cost, and high activity

Active Publication Date: 2021-04-09
山东海氢能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of high consumption, low output, high stability and low activity of traditional support electrode materials (nickel mesh) used for electrolysis of water
At the same time, it solves the problems of cumbersome process, high cost and poor product stability in forming a multi-level structure on the support body.

Method used

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  • Multi-stage structure electrode for electrolyzing water, and preparation method of multi-stage structure electrode
  • Multi-stage structure electrode for electrolyzing water, and preparation method of multi-stage structure electrode
  • Multi-stage structure electrode for electrolyzing water, and preparation method of multi-stage structure electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: prepare the nickel mesh (E-NM) with rough surface

[0032] (1) A commercial nickel mesh (NM) with a size of 1.5 × 1 cm was ultrasonically treated in 3M HCl solution for 15 minutes to remove surface oxides and impurities, and then rinsed alternately with deionized water and ethanol several times in an ultrasonic bath. Afterwards, the nickel mesh was vacuum-dried at 60° C. and kept in a vacuum desiccator until use.

[0033] (2) 3M HCl continues to be used as the electrolyte, and a three-electrode system is used. The NM treated in step (1) is used as the working electrode, the graphite rod is used as the contrast electrode, and Ag / AgCl is used as the reference electrode. Chronoamperometry it is used for electrochemical For etching, set the voltage to 1V, and measure the performance of the E-NM electrodes obtained under different etching times. As shown in Table 1, the optimal time for electrochemical etching is 100s.

[0034] Table 1

[0035]

[0036] (3...

Embodiment 2

[0045] Embodiment 2: The preparation method of NiCoOOH / NiCo / E-NM is as follows:

[0046] (1) with 2M NH 4 Cl, 0.2M H 3 BO 3 , 0.1M NiSO 4 and 0.1M CoSO 4 The mixed solution of NiCo is used as the electrolyte for depositing NiCo, and a two-electrode system is adopted, and the E-NM-100s prepared by electrochemical etching in step (2) of Example 1 is used as the cathode. Using 500mA·cm -2 The constant current density is used for electrodeposition, the deposition time is 120s, NiCo / E-NM is obtained after washing and drying, and the mass of NiCo deposited per unit area of ​​E-NM-100s is 9.5mg / cm 2 .

[0047] (2) Using 1M KOH solution as the electrolyte, using a three-electrode system, using NiCo / E-NM as the working electrode, graphite rod as the counter electrode, and Hg / HgO as the reference electrode, the chronopotential method CP is used for electrochemical oxidation, Set 500mAcm -2 Oxidation was performed at a constant current for 30 min, and NiCoOOH / NiCo / E-NM electrodes...

Embodiment 3

[0050] Embodiment 3: The preparation method of NiMoOOH / NiMo / E-NM is specifically as follows:

[0051] (1) with 2M NHCl 4 , 0.2M of H 3 BO 3 , 0.1M NiSO 4 and 0.1M of H 8 MON 2 o 4 The mixed solution of NiMo is used as the electrolyte for depositing NiMo, and a two-electrode system is adopted, and the E-NM-100s prepared by electrochemical etching in step (2) of Example 1 is used as the cathode. Using 500mA·cm -2 The constant current density is used for electrodeposition, and the deposition time is 120s. After washing and drying, NiMo / E-NM is obtained. The mass of NiMo deposited per unit area of ​​E-NM-100s is 9.7mg / cm 2 .

[0052] (2) Using 1M KOH solution as the electrolyte, using a three-electrode system, using NiMo / E-NM as the working electrode, graphite rod as the counter electrode, and Hg / HgO as the reference electrode, the chronopotential method CP is used for electrooxidation. Set 500mAcm -2 Oxidation was performed at a constant current for 30 min, and the NiMo...

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Abstract

The invention discloses a multi-stage structure electrode for electrolyzing water, and a preparation method of the multi-stage structure electrode. The preparation method comprises the following steps: carrying out electrochemical etching to obtain a primary-structure rough nickel net, depositing iron-based bimetal and alloy thereof on the surface of the rough nickel net according to different application purposes, and carrying out electrochemical oxidation in an alkaline electrolyte to form an iron-based bimetallic oxyhydroxide on the surface to obtain a tertiary structure. According to the method, the roughness of the surface of the nickel net is increased, anchoring sites are increased, and through the synergistic effect between the multi-stage structures, efficient catalytic activity is achieved while lasting durability is kept, and the performance is better than that of a loaded single-stage structure or a loaded double-stage structure; when the decomposition voltage reaches 2.0 V, the maximum current density can reach 10000 A / m<2> or above; the stability test after activation is that the performance remains basically unchanged after continuous hydrogen production for more than 100 hours at the current density of 6000 A / m<2>, and the electrode material prepared by the method shows excellent catalytic activity and stability, and is very suitable for industrial application of an electrolytic bath for electrolyzing water.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a multi-level structure electrode for electrolyzing water and a preparation method thereof. The electrode material improved by the method can be stably applied to the electrolyzed water industry under high current density. Background technique [0002] Due to the non-renewable nature of fossil fuels, people's growing concerns about energy and environmental issues have prompted people to seek green and renewable energy sources to replace fossil fuels. As a clean and renewable energy source, hydrogen shows great potential. The commonly used electrolysis of water hydrogen production process has been limited by the cost of electrolysis and has been developing slowly. Finding efficient electrocatalysts to accelerate the reaction of electrolysis of water is an effective way to solve the above technical problems. Ideal catalysts usually have lower activation energy barriers and can d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/031C25B11/052C25B11/061C25B11/091C25F3/02C25D3/56C25D11/34
CPCC25B1/04C25F3/02C25D3/562C25D11/34Y02E60/36
Inventor 王荣方武玉泰王许云王辉高登何刘勇王鹏潘磊
Owner 山东海氢能源科技有限公司
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