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Modified TM-LDH nano material, preparation method and application thereof

A nano-material and modification technology, which is applied in chemical instruments and methods, catalyst activation/preparation, electrodes, etc., can solve the problems of lack of water splitting catalysts, etc., and achieve the effects of reducing Tafel slope, reducing cost, and reducing overpotential

Active Publication Date: 2019-08-16
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ways of preparing defects on water-splitting catalysts, such as plasma bombardment, reducing gas treatment, etc., are difficult to achieve controllable preparation of specific defects at the atomic level, and there is still a lack of very effective water-splitting catalysts in this field.

Method used

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  • Modified TM-LDH nano material, preparation method and application thereof
  • Modified TM-LDH nano material, preparation method and application thereof
  • Modified TM-LDH nano material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: SAV-NiCu with single-atom vacancy defects x Preparation and Characterization of LDH Nanosheet Self-supporting Electrode

[0040] 1.1 Preparation of NiCu LDH nanosheet self-supporting electrode

[0041] NiCu LDH nanosheets were grown on nickel foam by hydrothermal method to prepare NiCu LDH nanosheet self-supporting electrodes. The specific operation is as follows:

[0042] A piece of nickel foam (2 cm x 3 cm) was immersed in 1M HCl solution for 10 min to remove surface oxides, then washed several times with deionized water and ethanol, and dried in an oven at 60 °C for later use.

[0043] Add x mL of 10mM nickel nitrate (Ni(NO 3 ) 2 ) aqueous solution and y mL of 5mM copper nitrate (Cu(NO 3 ) 2 ) aqueous solution, and then add 87mL of deionized water. The Ni / Cu molar ratio in the product is adjusted by adjusting the ratio of x and y, wherein x+y=2, preferably x=y=1. Then, under magnetic stirring, 1 mL of 100 mM aqueous urea solution was added to the b...

Embodiment 2

[0054] Example 2: SAV-NiFeCu with single-atom vacancy defects x Preparation and Characterization of LDH Nanosheets

[0055] 2.1 Preparation of NiFeCu LDH nanosheets

[0056] NiFeCu LDH nanosheets were synthesized by hydrothermal method, the specific operation is as follows.

[0057] Add x mL of 1M ferric chloride (FeCl 3 ) aqueous solution, y mL of 1M nickel chloride (NiCl 2 ) aqueous solution and zmL of 1M copper chloride (CuCl 2 ) aqueous solution, by adjusting the ratio of x, y and z to adjust the Fe / Ni / Cu molar ratio in the product, wherein x+y+z=1.45, preferably x=z=0.145, y=1.16. Another 71 mL of deionized water was added. Then, under magnetic stirring, 5.6 mL of 0.5 M urea aqueous solution and 2 mL of 0.01 M trisodium citrate aqueous solution were added to the beaker. Then the resulting mixed solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel autoclave, and after sealing, a hydrothermal reaction was performed in an oven at 180 °C...

Embodiment 3

[0065] Example 3: SAV-NiFe with single-atom vacancy defects x Preparation and Characterization of LDH Nanosheet Self-supporting Electrode

[0066] 1.1 NiFe x Preparation of LDH Nanosheet Self-supporting Electrode

[0067] Growth of NiFe on Nickel Foam by Hydrothermal Method x LDH nanosheets, prepared NiFe x LDH nanosheet self-supporting electrode, the specific operation is as follows:

[0068] A piece of nickel foam (2 cm x 3 cm) was immersed in 1M HCl solution for 10 min to remove surface oxides, then washed several times with deionized water and ethanol, and dried in an oven at 60 °C for later use.

[0069] Add x mL of 10mM nickel nitrate (Ni(NO 3 ) 2 ) aqueous solution and y mL of 5mM copper nitrate (Fe(NO 3 ) 3 ) aqueous solution, and then add 87mL of deionized water. The Ni / Fe molar ratio in the product is adjusted by adjusting the ratio of x to y, wherein x+y=2, preferably x=y=1. Then, under magnetic stirring, 1 mL of 100 mM aqueous urea solution was added ...

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Abstract

The invention provides a modified transition metal base-layer dihydroxy compound nano material, which comprises two or three transition metals, and further comprises an atomic level cation vacancy defect, the atomic level cation vacancy defect is a vacancy defect left by removing of one of the transition metals. The invention also provides a preparation method of the nano material through complexation reaction, and the preparation method can selectively remove designated metal ions to controllably form the atomic level cation vacancy defect at the atomic level, and has simple operation and mild reaction. The nano material and a water decomposition catalyst and a water decomposition electrode containing the nano material show lower decomposition water overpotential and faster hydrogen production rate, and have wide application prospect in efficient and cheap large-scale commercial water decomposition hydrogen production.

Description

technical field [0001] The invention relates to the technical fields of electrocatalytic materials and new energy, in particular to a modified transition metal-based layered bishydroxyl compound nanomaterial and a preparation method thereof, and a water treatment product using the modified transition metal-based layered bishydroxyl compound nanomaterial. Decomposition catalyst, water-splitting electrode and water-splitting electrode system. Background technique [0002] The aggravation of global energy shortage and environmental pollution has made people's demand for clean and renewable energy more and more urgent. Hydrogen has the advantages of high energy density and non-polluting combustion products, and is considered to be one of the most ideal green energy sources that can replace fossil fuels. At present, the methods for producing hydrogen mainly include hydrogen production by steam reforming of natural gas, hydrogen production by methanol cracking and hydrogen produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06B01J23/755B01J23/80B01J31/22B01J37/10B01J37/16B01J37/02
CPCC25B1/04B01J23/755B01J23/80B01J31/1805B01J27/02B01J37/10B01J37/16B01J37/0201C25B11/057B01J35/33Y02E60/36
Inventor 龙霞杨世和谢扬山鞠敏
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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