Close-packed hexagonal nickel and polycrystalline phase nickel heterojunction electrocatalyst as well as preparation method and application thereof

An electrocatalyst, hexagonal close-packed technology, applied in circuits, structural parts, electrical components, etc., can solve the hexagonal close-packed phase alkaline hydrogen oxidation reaction test, face-centered cubic phase and hexagonal close-packed phase that cannot be successfully prepared. The phase ratio cannot be controlled, and the control of the relative catalyst activity of the face-centered cubic phase and the hexagonal close-packed phase cannot be studied, so as to achieve the effects of high durability, optimized adsorption energy, and reduced generation energy.

Active Publication Date: 2021-11-30
SUZHOU INSTITUE OF WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned nickel catalyst has a hexagonal close-packed phase that is only coated on the surface, and the ratio of the face-centered cubic phase to the hexagonal close-packed phase cannot be adjusted. The pure phase of the hexagonal close-packed phase cannot be successfully prepared and the alkaline hydrogen oxidation reaction has not been tested. Therefore, it is impossible to study the root cause of the relative catalyst activity regulation of face-centered cubic phase and hexagonal close packing

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  • Close-packed hexagonal nickel and polycrystalline phase nickel heterojunction electrocatalyst as well as preparation method and application thereof
  • Close-packed hexagonal nickel and polycrystalline phase nickel heterojunction electrocatalyst as well as preparation method and application thereof
  • Close-packed hexagonal nickel and polycrystalline phase nickel heterojunction electrocatalyst as well as preparation method and application thereof

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preparation example Construction

[0071] The invention provides a method for preparing a polycrystalline nickel heterojunction electrocatalyst, comprising the following steps:

[0072] S1, using the colloid method to prepare close-packed hexagonal nickel nanoparticles;

[0073] S2, dispersing the close-packed hexagonal nickel nanoparticles and carbon carrier prepared in step S1 in an organic solvent, ultrasonically treating them for 1 to 4 hours, and then collecting them by centrifugation and vacuum drying to obtain a mixture; then placing the mixture under reduction In a neutral atmosphere, calcining treatment at a calcination temperature higher than 250°C and lower than 600°C for 0.5-2h to obtain a close-packed hexagonal / face-centered cubic nickel heterojunction, which is a polycrystalline nickel heterojunction electrocatalyst.

[0074] Preferably, in step S1, the specific preparation method of the close-packed hexagonal nickel nanoparticles is:

[0075] Mix nickel acetylacetonate, glucose and oleylamine ac...

Embodiment 1

[0082] Embodiment 1 provides a kind of preparation method of close-packed hexagonal nickel electrocatalyst, comprising the following steps:

[0083] S1. Synthesis of close-packed hexagonal nickel:

[0084] Usually, put 135mg of nickel acetylacetonate, 600mg of glucose and 10mL of oleylamine into a two-necked flask and stir, heat the mixture to 60°C to form a homogeneous solution and then blow it with nitrogen, keep the reaction temperature for 1 hour, at 10°C / min The speed is gradually heated to 190 ° C and maintained for 2 hours. The cooled product is washed with n-hexane and ethanol to remove impurities at least 3 times, and is collected by centrifugation at 9800rpm to prepare close-packed hexagonal nickel nanoparticles, such as figure 1 shown.

Embodiment 2

[0086] Embodiment 2 provides a kind of preparation method of polycrystalline nickel heterojunction electrocatalyst, comprises the following steps:

[0087] S1. Synthesis of close-packed hexagonal nickel:

[0088] Usually, put 135mg of nickel acetylacetonate, 600mg of glucose and 10mL of oleylamine into a two-necked flask and stir, heat the mixture to 60°C to form a homogeneous solution and then blow it with nitrogen, keep the reaction temperature for 1 hour, at 10°C / min The speed is gradually heated to 190 ° C and maintained for 2 hours. The cooled product is washed with n-hexane and ethanol to remove impurities at least 3 times, and is collected by centrifugation at 9800rpm to prepare close-packed hexagonal nickel nanoparticles, such as figure 1 shown.

[0089] S2. Synthesis of close-packed hexagonal / face-centered cubic nickel heterojunction:

[0090] Disperse the hexagonal close-packed nickel nanoparticles and XC-72R carbon black prepared in step S1 in an ethanol solution...

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Abstract

The invention provides a close-packed hexagonal nickel and polycrystalline phase nickel heterojunction electrocatalyst as well as a preparation method and an application thereof. Firstly, nickel acetylacetonate is used as a precursor, oleylamine is used as a solvent, anhydrous dextrose is used as a surfactant, a close-packed hexagonal nickel precursor is synthesized in an organic solution through a simple colloidal method, then annealing is performed in a reducing atmosphere, and the close-packed hexagonal/face-centered cubic nickel heterostructure electrocatalyst, namely, the polycrystalline phase nickel heterojunction electrocatalyst, is prepared. According to the catalyst, the binding energy of hydrogen and oxyhydrogen species can be optimized at the same time through mutual adjustment of interface electronic structures, and meanwhile, the forming energy of water is reduced, so that the catalyst has excellent hydroxide performance, and then the catalyst has a huge application prospect in the field of alkaline medium hydroxide reaction. The invention further provides two preparation methods for preparing face-centered cubic nickel with different sizes.

Description

technical field [0001] The invention relates to the technical field of electrocatalyst preparation, in particular to a close-packed hexagonal nickel, face-centered cubic nickel, polycrystalline nickel heterojunction electrocatalyst, a preparation method and an application thereof. Background technique [0002] Hydrogen is considered as one of the most promising clean energy carriers due to its environmental friendliness and high energy density. Harnessing hydrogen through fuel cell technology is a key component in achieving a low-carbon emission hydrogen economy. Compared with proton exchange membrane fuel cells, alkaline exchange membrane fuel cells have attracted much attention due to the possibility of using non-platinum group metal catalysts. So far, considerable research has been devoted to the development of PGM-free electrocatalysts with comparable performance to standard Pt-based catalysts for the cathodic oxygen reduction reaction in alkaline exchange membrane fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B22F1/00B82Y30/00B82Y40/00
CPCH01M4/9041B82Y30/00B82Y40/00Y02E60/50Y02E60/36
Inventor 罗威李芸博苏立新
Owner SUZHOU INSTITUE OF WUHAN UNIV
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