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Phytic acid modified transition metal layered double hydroxide as well as preparation method and application thereof

A transition metal layer and double hydroxide technology, applied in chemical instruments and methods, nickel compounds, cobalt compounds, etc., can solve the problems of poor conductivity, high price, low reserves, etc., to promote electron transport, enhance conductivity, The effect of improving durability

Active Publication Date: 2021-11-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iridium dioxide and ruthenium dioxide exhibit excellent catalytic activity for water oxidation reactions, but iridium and ruthenium are low in reserves, expensive, and cannot maintain long-term stability in the catalytic process
However, due to its poor conductivity and inability to maintain its activity and stability under high current density, its large-scale industrial production and commercialization are restricted.

Method used

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  • Phytic acid modified transition metal layered double hydroxide as well as preparation method and application thereof
  • Phytic acid modified transition metal layered double hydroxide as well as preparation method and application thereof
  • Phytic acid modified transition metal layered double hydroxide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] In this example, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are used together as the transition metal salt, and cetyltrimethylammonium bromide is used as the basic substance to further illustrate the transition metal layered double hydroxide modified by phytic acid in this application. method of preparation.

[0053] A method for preparing a phytic acid-modified transition metal layered double hydroxide (PA-NiCo-LDH / NF) in this embodiment, the method specifically includes the following steps:

[0054] (a) Pretreatment of nickel foam (NF): cut a piece with a size of 3×7cm -2 Nickel foam (NF) was placed in 1mol / L dilute hydrochloric acid solution, acetone and deionized water for ultrasonic treatment for 10 minutes respectively. After the ultrasonic treatment was completed, it was taken out and dried in a vacuum oven at 60°C for 2 hours. Obtain pretreated nickel foam;

[0055] (b) Solvothermal reaction: Dissolve 0.6543g (2.25mmol) nickel nitrate hexahydrat...

Embodiment 2

[0061] In this example, nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and manganese nitrate tetrahydrate are used as transition metal salts, and hexadecyltrimethylammonium bromide is used as an alkaline substance to further illustrate the transition metal layer modified by phytic acid in this application. The preparation method of double hydroxide.

[0062] A preparation method of a phytic acid-modified transition metal layered double hydroxide (PA-NiCoMn-LDH / NF) of the present embodiment, the method specifically includes the following steps:

[0063] (a) Pretreatment of nickel foam (NF): cut a piece with a size of 3×7cm -2 Nickel foam (NF) was placed in 3mol / L dilute hydrochloric acid solution, acetone and deionized water for 10 minutes of ultrasonic treatment respectively. After the ultrasonic treatment was completed, it was taken out and dried in a vacuum oven at 60°C for 2 hours. Obtain pretreated nickel foam;

[0064] (b) Solvothermal reaction: 0.2908g (1mmol)...

Embodiment 3

[0067] In this example, cobalt nitrate hexahydrate and manganese nitrate tetrahydrate are used together as the transition metal salt, and cetyltrimethylammonium bromide is used as the basic substance to further illustrate the transition metal layered double hydroxide modified by phytic acid in this application. method of preparation.

[0068] A method for preparing a phytic acid-modified transition metal layered double hydroxide (PA-CoMn-LDH / NF) in this embodiment, the method specifically includes the following steps:

[0069] (a) Pretreatment of nickel foam (NF): cut a piece with a size of 3×7cm -2 Nickel foam (NF) was placed in 2mol / L dilute hydrochloric acid solution, acetone and deionized water for 10 minutes of ultrasonic treatment respectively. After the ultrasonic treatment was completed, it was taken out and dried in a vacuum oven at 60°C for 2 hours. Obtain pretreated nickel foam;

[0070] (b) Solvothermal reaction: 0.6548g (2.25mmol) cobalt nitrate hexahydrate, 0.1...

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Abstract

The invention discloses phytic acid modified transition metal layered double hydroxide as well as a preparation method and application thereof, and belongs to the technical field of preparation of electrolytic water anode electrode materials. The preparation method comprises the following steps: sequentially dissolving transition metal salt and an alkaline substance in a solvent, uniformly mixing, adding a pretreated conductive substrate, and growing transition metal layered double hydroxide on the surface of the conductive substrate in situ by adopting a hydrothermal method or a solvothermal method; and immersing the conductive substrate with the transition metal layered double hydroxide growing on the surface into a phytic acid solution, and preparing the phytic acid modified transition metal layered double hydroxide through a solvothermal method. The preparation method disclosed by the invention is simple and easy to implement and mild in reaction condition. The prepared phytic acid modified transition metal layered double hydroxide is used as an electrocatalyst for water oxidation reaction, and shows excellent catalytic activity and durability in alkaline electrolyte.

Description

technical field [0001] The invention belongs to the technical field of preparation of anode electrode materials for electrolysis of water, and in particular relates to a transition metal layered double hydroxide modified by phytic acid and its preparation method and application, especially the application as a water oxidation electrocatalyst in electrocatalytic water decomposition. Background technique [0002] In the face of increasing environmental pollution and energy crisis, it is crucial to develop efficient energy storage and conversion systems, such as water electrolysis devices and metal-air batteries. The water oxidation reaction (OER) at the anode is an important reaction in water electrolysis devices and metal-air batteries, and the water oxidation reaction has slow kinetics because the reaction involves a four-electron transfer process. Iridium dioxide and ruthenium dioxide exhibit excellent catalytic activity for water oxidation reactions, but iridium and ruthen...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G53/00C01G49/00C25B11/054C25B11/075C25B1/04
CPCC01G51/00C01G53/00C01G49/00C01G53/006C25B11/054C25B11/075C25B1/04C01P2002/22C01P2002/72C01P2004/03C01P2002/82C01P2006/40Y02E60/36
Inventor 蔡卫卫周顺发李静时佳维刘朝
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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