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A noble metal single-atom catalyst for electrolysis of water and oxygen evolution, its preparation method and application

A technology of precious metals and electrolysis of water, applied in chemical instruments and methods, physical/chemical process catalysts, electrolytic components, etc., can solve problems such as poor stability, agglomeration of precious metal elements, weak interaction, etc., to achieve tight combination and improve catalytic reaction kinetics Learning and promoting the effect of electron transfer

Active Publication Date: 2022-03-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current noble metal single-atom catalysts also have some shortcomings, such as difficult preparation and poor stability.
This is mainly due to the weak interaction between the noble metal single atom and the support, which is prone to problems such as agglomeration or detachment of noble metal elements, which eventually leads to catalyst deactivation.

Method used

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  • A noble metal single-atom catalyst for electrolysis of water and oxygen evolution, its preparation method and application
  • A noble metal single-atom catalyst for electrolysis of water and oxygen evolution, its preparation method and application
  • A noble metal single-atom catalyst for electrolysis of water and oxygen evolution, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Dissolve the following raw materials in deionized water, mix well, and prepare stock solution:

[0061] Ferric Nitrate Nonahydrate 0.12%

[0062] Nickel nitrate hexahydrate 0.09%

[0063] Thiourea 0.025%

[0064] (2) Take a part of the stock solution and add iridium trichloride hydrate with a mass percentage ratio of 0.018% to prepare an electrosorption solution for preparing a sulfide catalyst supporting monoatomic iridium.

[0065] (3) With nickel foam as the working electrode, carbon rod as the counter electrode, and Hg / HgO electrode as the reference electrode, put it into the stock solution prepared in step (1), and electrodeposit it by cyclic voltammetry, and the scanning range is -1.2V ~0.2V, scan rate is 10mV / s, cycle number is 6 times. Deposition of nickel iron sulfide substrates on nickel foam.

[0066] (4) With the nickel-iron sulfide substrate prepared in step (3) as the working electrode, the carbon rod as the counter electrode, and the Hg / HgO electr...

Embodiment 2

[0069] (1) Dissolve the following raw materials in deionized water, mix well, and prepare stock solution:

[0070] Ferric chloride hexahydrate 0.12%

[0071] Nickel chloride hexahydrate 0.09%

[0072] Thiourea 0.025%

[0073] (2) Take a part of the stock solution and add iridium trichloride hydrate with a mass percentage ratio of 0.018% to prepare an electrosorption solution for preparing a sulfide catalyst supporting monoatomic iridium.

[0074] (3) With nickel foam as the working electrode, carbon rod as the counter electrode, and Hg / HgO electrode as the reference electrode, put it into the stock solution prepared in step (1), and electrodeposit it by cyclic voltammetry, and the scanning range is -1.2V ~0.2V, scan rate is 10mV / s, cycle number is 6 times. Deposition of nickel iron sulfide substrates on nickel foam.

[0075] (4) With the nickel-iron sulfide substrate prepared in step (3) as the working electrode, the carbon rod as the counter electrode, and the Hg / HgO elec...

Embodiment 3

[0078] (1) Dissolve the following raw materials in deionized water, mix well, and prepare stock solution:

[0079] Ferric Nitrate Nonahydrate 0.5%

[0080] Nickel nitrate hexahydrate 0.4%

[0081] Thiourea 0.1%

[0082] (2) Take a part of the stock solution and add iridium trichloride hydrate with a mass percentage ratio of 0.018% to prepare an electrosorption solution for preparing a sulfide catalyst supporting monoatomic iridium.

[0083] (3) With nickel foam as the working electrode, carbon rod as the counter electrode, and Hg / HgO electrode as the reference electrode, put it into the stock solution prepared in step (1), and electrodeposit it by cyclic voltammetry, and the scanning range is -1.2V ~0.2V, scan rate is 10mV / s, cycle number is 6 times. Deposition of nickel iron sulfide substrates on nickel foam.

[0084] (4) With the nickel-iron sulfide substrate prepared in step (3) as the working electrode, the carbon rod as the counter electrode, and the Hg / HgO electrode ...

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Abstract

The invention provides a preparation method of a noble metal single-atom catalyst for electrolysis of water and oxygen evolution, comprising the following steps: A) mixing a non-noble metal salt and thiourea in water to obtain a stock solution; mixing the non-noble metal salt, thiourea and a noble metal The salt is mixed in water to obtain an electrosorption solution; B) using the conductive substrate as a working electrode, and depositing a non-noble metal sulfide substrate on the surface of the conductive substrate by means of electrochemical reduction in the stock solution; C) depositing a non-noble metal sulfide substrate with the above-mentioned deposition The conductive substrate of the sulfide substrate is a working electrode, and the noble metal single atom is adsorbed on the surface of the non-noble metal sulfide substrate by means of electrochemical reduction in the electro-adsorption solution to obtain a noble metal single-atom catalyst. The catalyst prepared by the invention has an ultra-thin nano-microstructure, and a small amount of noble metal single atoms are directly anchored on the outer surface of the sulfide material, which greatly improves the catalytic activity of the non-noble metal sulfide catalyst in the oxygen evolution reaction, and has a lower Oxygen evolution overpotential.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a noble metal single-atom catalyst for electrolysis of water for oxygen evolution and its preparation method and application. Background technique [0002] With the increasing demand for clean energy such as solar energy and wind energy, renewable energy conversion and storage technology has become a global research hotspot. Electrocatalytic water splitting to produce hydrogen is an effective way to promote green energy conversion. In order to solve the problem of slow kinetics of the oxygen evolution half-reaction, alloy / metal oxide catalysts with precious metal iridium or ruthenium as active sites are mainly used at present, but their high price increases the production cost day by day. Single-atom catalysts can effectively increase the utilization rate of atoms, reduce the amount of noble metal elements, and improve the intrinsic activity of the catalyst. In recent years, r...

Claims

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Application Information

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IPC IPC(8): B01J27/045C25B11/093C25B1/04
CPCB01J27/045C25B1/04B01J35/33Y02E60/36
Inventor 曹瑞国蔡文斌雷占武焦淑红
Owner UNIV OF SCI & TECH OF CHINA
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