Palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on conductive substrate and preparation method and application of electrocatalyst

A nanotube array, conductive substrate technology, applied in the field of nanomaterials, can solve the problem of limited improvement of the catalytic performance of palladium electrolysis of water for hydrogen production, and achieve the effects of promoting electron transfer rate, good reproducibility, and improving diffusion speed.

Active Publication Date: 2018-12-14
HENAN UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

However, this method has limited improvement in the catalytic performance of palladium electrolysis for hydrogen production.

Method used

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  • Palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on conductive substrate and preparation method and application of electrocatalyst
  • Palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on conductive substrate and preparation method and application of electrocatalyst
  • Palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on conductive substrate and preparation method and application of electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on a conductive substrate is prepared by the following steps:

[0039] (1) Preparation of nickel-cobalt growth solution: 0.5 g nickel nitrate (0.034 mol / L), 1.0 g cobalt nitrate (0.043 mol / L), 0.3 g urea (0.062 mol / L) were dissolved in 80 mL aqueous solution, and stirred until Uniform;

[0040] The first kettle heat reaction: put the cleaned conductive substrate into a 20 mL reaction kettle, add 10 mL nickel-cobalt growth solution, immerse the conductive substrate, keep it in an oven at 150°C for 4 hours, and perform the first kettle heat reaction. After the reaction, cool to room temperature, wash with distilled water, and dry it in a 60°C oven to obtain a conductive substrate with nickel-cobalt compounds grown on it;

[0041] (2) Aqueous solution of sulfur-containing compounds: dissolve 2.5 g of sodium sulfide (0.352 mol / L) in 50 mL of distilled water, and stir until clear;

[0042] The ...

Embodiment 2

[0048] The palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on the conductive substrate provided in this example was prepared by referring to the method of Example 1, the only difference being that 66.6 μL of concentrated HCl was added to the palladium source solution to make the palladium source solution acidic .

[0049] The palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on the conductive substrate obtained in embodiment 2 is characterized by SEM, and the results are as follows: Figure 4 As shown; under the three-electrode system (same as Example 1), the palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst was tested for electrocatalytic water desorption hydrogen, and the results are as follows Figure 5 shown.

[0050] pass Figure 4 and figure 2 contrast, Figure 5 and image 3 The comparison shows that under different pH conditions, the microscopic morphology of the palladium-nickel-coba...

Embodiment 3

[0052] The palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on the conductive substrate provided in this example was prepared with reference to the method of Example 2, the only difference being that when preparing the palladium source solution, 3.91 mg of sodium chloropalladate was replaced with 2.36 mg palladium chloride (1.33 mmol / L).

[0053] The palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on the conductive substrate obtained in embodiment 3 is characterized by SEM, and the results are as follows: Image 6 As shown; under the three-electrode system (same as Example 1), the palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst was tested for electrocatalytic water desorption hydrogen, and the results are as follows Figure 7 shown.

[0054] pass Image 6 and Figure 4 contrast, Figure 7 and Figure 5 The comparison shows that the microscopic morphology of palladium-nickel-cobalt-sulfur co...

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Abstract

The invention discloses a palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on a conductive substrate and a preparation method and the application of the electrocatalyst. The preparation method comprises the following steps: firstly, soaking a conductive substrate which is cleaned into a nickel-cobalt growth liquid, carrying out a primary kettle thermal reaction, soaking into a sulfur-containing compound solution, carrying out a secondary kettle thermal reaction, finally soaking into a palladium source solution, and carrying out a third kettle thermal reaction, so as to obtain the palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on the conductive substrate. The palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst is grown on the surface of the conductive substrate, and palladium is distributed on the surface of palladium-nickel-cobalt-sulfur nano sodium. The invention further discloses the application of the palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst in water decomposition hydrogen production. The electrocatalyst has the characteristics of being simple in preparation process, low in cost and good in reproducibility, a palladium-nickel-cobalt-sulfur composite nanotube array is grown on the surface of the conductive substrate in situ, palladium-nickel-cobalt-sulfur has a goodbinding capability with the conductive substrate, and the electrocatalyst has a unique nanotube array structure and is excellent in electro-catalytic property.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and specifically relates to a palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst grown on a conductive substrate and a preparation method thereof, and the palladium-nickel-cobalt-sulfur composite nanotube array electrocatalyst in water splitting application in hydrogen production. Background technique [0002] In order to get rid of the limitation of human social and economic development caused by energy depletion, it is becoming more and more urgent to find clean energy to replace fossil fuels in non-renewable resources. Hydrogen energy has attracted widespread attention due to its advantages of high efficiency, cleanliness, and regeneration. [0003] Hydrogen production by electrolysis of water is an important hydrogen production method nowadays. Whether hydrogen is produced from reduced water at the cathode or oxygen is produced from oxidized water at the anode in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02B01J37/10H01M4/90C01B3/04
CPCB01J27/02B01J35/0033B01J37/10C01B3/042H01M4/9041Y02E60/36Y02E60/50
Inventor 李奇于善武孙嘉杰白锋
Owner HENAN UNIVERSITY
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