Full-water-electrolysis catalyst, and preparation method and application thereof

A catalyst and water-splitting technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrolytic processes, etc., can solve the problems of synthesizing single-metal catalysts, unsolved oxidation decomposition, and difficulty in controlling the loading of active components. High stability, improved stability and activity, high activity effect

Active Publication Date: 2020-01-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst exhibited excellent stability during testing, but its loading of active components was difficult to control and only a single metal catalyst could be synthesized, which limited its potential as a total water splitting catalyst
More importantly, neither of the above two types of binder-free catalysts has solved the root problems of the rapid loss of catalyst activity, such as oxidative decomposition and structural reconstruction during the testing process.

Method used

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  • Full-water-electrolysis catalyst, and preparation method and application thereof
  • Full-water-electrolysis catalyst, and preparation method and application thereof
  • Full-water-electrolysis catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment provides a catalyst for total water splitting, wherein the catalyst is prepared by the following method:

[0071] 1) Mix 1.4cm×1cm three-dimensional nickel foam with hydrogen peroxide and ultrasonically infiltrate hydrogen peroxide into the nickel foam skeleton to obtain mixture A. Mixture A is oxidized at 120°C for 2 hours, then washed and dried to obtain oxidized three-dimensional nickel foam ; After mixing the oxidized three-dimensional nickel foam with a mass ratio of 1:10 and the first part of sodium hypophosphite, the reaction is carried out under an inert atmosphere at 2°C / min from room temperature to 325°C and kept at a constant temperature for 2h to obtain a three-dimensional Nickel Foam Carrier Derived Ni 2 P film is a single-component phosphide precursor;

[0072] 2) Disperse the obtained single-component phosphide precursor (about 2.04 g) with 1 mmol of cobalt nitrate hexahydrate, 0.5 mmol of nickel nitrate hexahydrate, 1 mmol of urea and 2 ...

Embodiment 2

[0074] This embodiment provides a catalyst for total water splitting, wherein the catalyst is prepared by the following method:

[0075] 1) Mix 1.4cm×1cm three-dimensional nickel foam with hydrogen peroxide and ultrasonically make the hydrogen peroxide penetrate into the nickel foam skeleton to obtain mixture A. Mixture A is oxidized at 80°C for 1 hour, then washed and dried to obtain the oxidized three-dimensional nickel foam ; After mixing the oxidized three-dimensional nickel foam with a mass ratio of 1:3 and the first part of sodium hypophosphite, the reaction is carried out under an inert atmosphere at 2°C / min from room temperature to 300°C and kept at a constant temperature for 1h to obtain a three-dimensional Nickel Foam Carrier Derived Ni 2 P film is a single-component phosphide precursor;

[0076] 2) Disperse the obtained single-component phosphide precursor with 1.125 mmol of cobalt nitrate hexahydrate, 0.375 mmol of nickel nitrate hexahydrate, and 3 mmol of sodium ...

Embodiment 3

[0078] This embodiment provides a catalyst for total water splitting, wherein the catalyst is prepared by the following method:

[0079] 1) Mix 1.4cm×1cm three-dimensional nickel foam with hydrogen peroxide and ultrasonically make hydrogen peroxide penetrate into the nickel foam skeleton to obtain mixture A. Mixture A is oxidized at 160°C for 4 hours, then washed and dried to obtain the three-dimensional nickel foam after oxidation treatment ; After mixing the oxidized three-dimensional nickel foam with a mass ratio of 1:20 and the first part of sodium hypophosphite, the reaction is carried out under an inert atmosphere at 10°C / min from room temperature to 360°C and kept at a constant temperature for 4h to obtain a three-dimensional Nickel Foam Carrier Derived Ni 2 P film is a single-component phosphide precursor;

[0080] 2) Disperse the obtained one-component phosphide precursor with 0.75 mmol of cobalt nitrate hexahydrate, 0.75 mmol of nickel nitrate hexahydrate, 1 mmol of...

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Abstract

The invention provides a full-water-electrolysis catalyst, and a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: 1) carrying out aheating reaction on oxidized three-dimensional foamed nickel and a first part of a phosphorus source according to a mass ratio of 1:(3-20) to generate a Ni2P film on the three-dimensional foamed nickel carrier; and 2) mixing a product obtained after the reaction in step 1), a cobalt salt and a nickel salt having a molar ratio of (1-3):1, an alkali source and water, carrying out hydrothermal treatment on the obtained mixture, washing and drying the hydrothermal treatment product to obtain a product A, and carrying out a heating reaction on the product A and a second part of the phosphorus source according to a mass ratio of 1:(3-20) to realize secondary phosphorization in order to obtain the full-water-electrolysis catalyst. The catalyst can be used for electrolyzing water. The preparationmethod improves the stability and the activity of the catalyst through Ni2P with a strong binding force with a carrier, in situ growing on the foamed nickel structure, by primary phosphorization and forming a defect interface by loading. The catalyst has a high stability and a high activity when used for electrolyzing water.

Description

technical field [0001] The invention belongs to the field of hydrogen production by electrolysis of water, and relates to a heterostructure total water splitting catalyst with high stability and high activity and abundant defect interfaces. Background technique [0002] Hydrogen production by electrolysis of water is an effective way to obtain clean energy, and electrocatalysts are usually required to improve the efficiency of oxygen evolution at the anode and hydrogen evolution at the cathode. At present, platinum-based and ruthenium-based catalysts are ideal materials for hydrogen evolution and oxygen evolution reactions, but their high cost limits the large-scale application of such catalysts in water electrolysis reactions, and the activation energy barrier of anodic oxygen evolution reactions is high, which will make The efficiency of the entire electrolytic cell is reduced. The total water splitting catalysts developed in recent years, such as transition metal phosphi...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/04C25B11/03C25B11/06
CPCB01J27/1853C25B1/04C25B11/057C25B11/031C25B11/051C25B11/091B01J35/33Y02E60/36
Inventor 杨英顾林郝世杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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