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Hydrogen evolution electrode and preparation and application thereof

A hydrogen evolution electrode, nickel hydroxide technology, applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problem of electrode polarization performance decline, poor conductivity, etc., to achieve reduced ohmic polarization, good stability, and improved reaction. active effect

Active Publication Date: 2020-12-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of nickel hydroxide is poor, so that the platinum distributed on the surface of nickel hydroxide increases the ohmic resistance and the polarization performance of the electrode decreases.

Method used

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  • Hydrogen evolution electrode and preparation and application thereof
  • Hydrogen evolution electrode and preparation and application thereof
  • Hydrogen evolution electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Nickel foam with a thickness of 1.6mm (surface density is 250g / cm 2 ) sheet cut into an effective area of ​​1 × 2cm 2 Rectangular, respectively by acetone ultrasonic cleaning 15min, 3M hydrochloric acid ultrasonic cleaning 15min, deionized water ultrasonic cleaning 3min, repeat the deionized water ultrasonic cleaning process 3-5 times (here 3 times), in the final concentration of 0.05mM chlorine 3 mL of a mixed solution of nickel chloride and sodium chloride with a final concentration of 0.8 mM, adjusted to pH 4 with 3 M hydrochloric acid, and reacted at 60° C. for 1 h. The obtained electrode was deposited in 3 mL of chloroplatinic acid with a platinum concentration of 10 μg / mL at a pH of 3 (adjusted with 3M hydrochloric acid) at 40° C. for 1 h, and then dried at 60° C. before use. Platinum nanoparticles are particles with an average particle diameter of about 60nm. This type of particle is composed of platinum particles with an average diameter of 3.8nm. The amount i...

Embodiment 2

[0034] With the preparation process of Example 1, the difference from Example 1 is that the chloroplatinic acid in Example 1 is changed to chloroiridic acid, and other conditions are unchanged. Iridium nanoparticles distribution see Figure 4 , as can be seen from the figure, the average particle diameter of iridium nanoparticles is about 110nm, and these particles are aggregated by smaller nanoparticles (diameter 2-10nm). One side of the outer surface area) The mass loading capacity of iridium particles on the nickel foam is 14.3 μg / cm 2 , its hydrogen evolution performance is shown in Figure 8 with Figure 9 , the performance of electrodes applied to magnesium / seawater batteries see Figure 11 . The results show that the hydrogen evolution performance of the electrode under neutral conditions and the stability in the magnesium / water battery are similar to those of the platinum-modified electrode in Example 1.

Embodiment 3

[0036] Same as the preparation process of Example 1, the electrode heating time for preparing nickel hydroxide modified nickel foam in Example 1 is increased to 25h (no longer within the protection range), and other conditions remain unchanged. Its shape and structure see Figure 5 , hydrogen evolution performance see Figure 8 with Figure 9 , the performance of electrodes applied to magnesium / seawater batteries see Figure 11 . The results show that the thickness of the nickel hydroxide flake film on the surface of the electrode increases obviously, and the ohmic polarization of the electrode increases due to the increase of the thickness of the nickel hydroxide, which leads to an increase in the polarization of the electrode at a large current, and the deterioration of the electrode performance. The thickness of nickel hydroxide on the electrode surface must be controlled by the reaction time.

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Abstract

The invention relates to preparation and application of a hydrogen evolution electrode with low noble metal loading capacity. The preparation method comprises the following steps: taking foamed nickelas a substrate, cleaning the foamed nickel, etching the foamed nickel in an acidic solution containing chloride ions to form layered nano flaky nickel hydroxide perpendicular to the surface of the foamed nickel on the surface of the foamed nickel, and chemically depositing trace platinum or iridium nano particles between the layered nickel hydroxide to prepare the efficient hydrogen evolution electrode. The hydrogen evolution electrode prepared by the method has excellent alkaline and neutral hydrogen evolution activity and stability, and is applied to metal / seawater batteries and water electrolysis hydrogen production.

Description

technical field [0001] The invention relates to the preparation of a low-platinum or iridium-loaded hydrogen-evolving electrode and its application in a magnesium / seawater battery or hydrogen production reaction by electrolyzing water. Background technique [0002] Platinum has good performance as an electrocatalyst for electrolysis of water to produce hydrogen, but its price is high due to its small reserves in the earth's crust and its wide application. The current research on hydrogen evolution electrocatalysts mainly focuses on how to reduce the platinum loading and further improve the catalytic activity of platinum. . Increasing the specific surface area of ​​platinum is the main way to reduce platinum loading, so that the same mass of platinum exposes more surfaces to increase the number of active sites, such as preparing platinum into single atomic layers, nanowires, nanoparticles or atomic clusters, or even Single-atom platinum catalysts. There are many ways to imp...

Claims

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Application Information

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IPC IPC(8): C25B11/03B22F9/24B22F1/00C25B11/08C25B1/04
CPCB22F9/24C25B1/04B22F2009/245B22F1/054Y02E60/36
Inventor 王二东刘乾锋孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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