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Porous array electrode with two-stage structure as well as preparation method and application thereof

A porous array and porous conductive technology, applied in the field of electrolysis of water, can solve problems such as the inability to effectively increase the concentration of hydrogen-rich water and the inability to effectively generate nano-bubbles, and achieve the effects of being conducive to detachment, small bubble adhesion, and difficult to fall off.

Active Publication Date: 2020-05-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most hydrogen-rich cups cannot effectively increase the concentration of hydrogen-rich water. The key is that the core component electrode of electrolytic hydrogen production cannot effectively generate nano-bubbles.
[0003] In the process of realizing the present invention, the inventors found that: in the existing research, people such as Li Yingjie ([Li, Yingjie, Zhang, Haichuan, Xu, Tianhao, etc. Performance Hydrogen Evolution[J].Advanced Functional Materials,25(11):1737-1744, whose dissertation is: Construction of Novel Nano-array Electrodes and Its Application in Gas-Participated Electrocatalytic Reactions[D], Li Yingjie, Beijing , Beijing University of Chemical Technology, 2017) obtained pine-like Pt nanoarrays (that is, the primary structure is cone-shaped, and the secondary structure is zigzag) by electrodeposition in potassium nitrate solution with carbon paper as the counter electrode, see this patent Figure 20 and Figure 21 ) can effectively reduce the detachment size of the bubbles, but it is still micron-sized hydrogen bubbles

Method used

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  • Porous array electrode with two-stage structure as well as preparation method and application thereof
  • Porous array electrode with two-stage structure as well as preparation method and application thereof
  • Porous array electrode with two-stage structure as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0065] (1) Under the condition of 75° water bath, the titanium felt was etched with 10% oxalic acid solution for 1 hour. Ultrasonicate the etched titanium felt in an ultrasonic container with deionized water for 5 minutes until the surface of the etched titanium felt is cleaned.

[0066] (2) In a potassium chloride solution with a concentration of 120 mmol / L, a chloroplatinic acid solution with a concentration of 3 mmol / L is prepared and dissolved completely in ultrasound.

[0067] (3) Electrodeposition was performed using a three-electrode system in a constant temperature water bath at 25°C. Among them, the titanium felt was used as the working electrode, the platinum sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. After 5 minutes of electrodeposition at a constant potential of -0.5V, it can be taken out, then rinsed with deionized water, and dried in an oven at 120°C to obtain a porous array electrode.

[00...

Embodiment 2

[0074] Referring to the method in Example 1, step (1) etched the titanium sheet with an oxalic acid solution with a mass fraction of 15% for 2 hours under the condition of a 90° water bath. In step (2), in the potassium chloride solution with a concentration of 120 mmol / L, a chloroplatinic acid solution with a concentration of 6 mmol / L is prepared and completely dissolved in ultrasound. In step (3) at -15mA / cm 2 Electrodeposition under constant current, the others are the same as in Example 1, and a porous array electrode is finally obtained.

[0075] Characterize the above-mentioned titanium sheet and porous array electrode: the scanning electron microscope of the obtained titanium sheet substrate after etching can be found in the attached Figure 6 . The scanning electron microscope image of the platinum secondary array structure grown on the titanium sheet substrate can be found in Figure 7 , the overall morphology of the secondary array structure is sea urchin-like, th...

Embodiment 3

[0079] Referring to the method in Example 1, in step (3), the electrodeposition is performed using a three-electrode system under a constant temperature water bath at 50°C. Others are the same as in Example 1, and a porous array electrode is finally obtained.

[0080] Characterization of the above porous array electrodes:

[0081] The scanning electron microscope picture of the porous array electrode that embodiment 3 obtains sees Figure 11 . Figure 11 It can be seen that the length of the flakes is 50-400 nanometers, the width is 50-400 nanometers, and the thickness of the flakes is 4-15 nanometers.

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Abstract

The invention belongs to the technical field of water electrolysis, and particularly relates to a porous array electrode with a two-stage structure as well as a preparation method and application of the porous array electrode. The porous array electrode includes: a porous conductive substrate; a primary array structure grown on the porous conductive substrate; and a sheet-shaped, conical or spine-shaped secondary nano-structure growing on the surface of each unit of the primary array structure in a radial manner. The invention further discloses the preparation method and application of the electrode. The porous electrode structure is obtained for the first time; the surface of the conductive substrate is provided with an arrayed two-stage structure, so that firm combination with the conductive substrate can be achieved, damage and falling are not liable to occur, more active sites for electrochemical reactions are exposed, the electrochemical reaction efficiency is improved. More nanoscale hydrogen bubbles can be obtained when the porous array electrode is used as a cathode material for the water electrolysis hydrogen evolution reaction.

Description

technical field [0001] The invention belongs to the technical field of electrolyzed water, and in particular relates to a porous array electrode with a secondary structure and a preparation method and application thereof. Background technique [0002] Hydrogen is the smallest and simplest molecule in nature. With the in-depth research of researchers, it is found that the selective antioxidant effect of hydrogen is of great significance to life. Therefore, in recent years, hydrogen-rich cups that can produce hydrogen-rich water have been greatly researched, developed and applied. People hope that by drinking hydrogen-rich water containing nano-hydrogen bubbles daily, they can remove excess free radicals in the body, so as to prevent aging and Various chronic diseases have preventive and therapeutic effects. However, most hydrogen-rich cups cannot effectively increase the concentration of hydrogen-rich water. The key is that the electrodes, the core components of electrolytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/08C25B1/04C25D3/50
CPCC25B1/04C25D3/50C25B11/031C25B11/051C25B11/081Y02E60/36
Inventor 孙晓明李佳伟邝允
Owner BEIJING UNIV OF CHEM TECH
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