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Preparation method of vanadium-doped iron oxyhydroxideelectrocatalyst

An iron oxyhydroxide, electrocatalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem that elemental iron is easy to corrode iron oxides and reduce activity , HER overpotential problems, to achieve the effect of enhanced electrochemical performance, short cycle, low cost

Inactive Publication Date: 2019-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, elemental iron has obvious limitations as an electrocatalyst, first of all, its HER overpotential is high, and then elemental iron is easily corroded to form iron oxide, resulting in a decrease in its activity.

Method used

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  • Preparation method of vanadium-doped iron oxyhydroxideelectrocatalyst
  • Preparation method of vanadium-doped iron oxyhydroxideelectrocatalyst
  • Preparation method of vanadium-doped iron oxyhydroxideelectrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Take FeCl 3 ·6H 2 O, VCl 3 , CO(NH 2 ) 2 and NH 4 F was added to 10ml deionized water at the same time, and magnetically stirred at room temperature for 10 minutes to obtain a concentration of iron source of 0.08mol / L, a concentration of vanadium source of 0.035mol / L, CO(NH 2 ) 2 The concentration is 0.5mol / L, NH 4 The concentration of F is a clear solution A of 0.3mol / L;

[0022] 2) Pour the clarified solution A into the reaction liner at a filling ratio of 40% and seal it, then install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and then react at 90°C for 10 hours;

[0023] 3) After the hydrothermal reaction is over, cool the reaction kettle to room temperature naturally, take out the reaction solution, and collect the product through alternating centrifugal washing with water and absolute ethanol for 3 times. After vacuum drying at 50°C, pour it into a mortar and grind it into fine particles. Powdered samples, that is, nano...

Embodiment 2

[0025] 1) Take FeCl 3 ·6H 2 O, VCl 3 , CO(NH 2 ) 2 and NH 4 F was added to 20ml of deionized water at the same time, and magnetically stirred at room temperature for 20 minutes to obtain a concentration of iron source of 0.045mol / L, a concentration of vanadium source of 0.0125mol / L, CO(NH 2 ) 2 The concentration is 0.5mol / L, NH 4 The concentration of F is a clear solution A of 0.2mol / L;

[0026] 2) Pour the clarified solution A into the reaction liner at a filling ratio of 60% and seal it, then install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and react at 110°C for 15 hours;

[0027] 3) After the hydrothermal reaction is over, cool the reaction kettle to room temperature naturally, take out the reaction solution, and collect the product through alternating centrifugal washing with water and absolute ethanol for 3 times. After vacuum drying at 60°C, pour it into a mortar and grind it into fine particles. Powdered samples, that is, nan...

Embodiment 3

[0029] 1) Take FeCl 3 ·6H 2 O, VCl 3 , CO(NH 2 ) 2 and NH 4 F was added to 30ml deionized water at the same time, and magnetically stirred at room temperature for 30min to obtain a concentration of iron source of 0.033mol / L, a concentration of vanadium source of 0.005mol / L, CO(NH 2 ) 2 The concentration is 0.5mol / L, NH 4 The concentration of F is the clear solution A of 0.167mol / L;

[0030] 2) Pour the clarified solution A into the reaction liner at a filling ratio of 80% and seal it, then install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and react at 130°C for 20 hours;

[0031] 3) After the hydrothermal reaction is over, cool the reaction kettle to room temperature naturally, take out the reaction solution, and collect the product through alternate centrifugal washing with water and absolute ethanol for 3 times, dry it in vacuum at 70°C, pour it into a mortar, and grind it into fine particles. Powdered samples, that is, spherical va...

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Abstract

The invention relates to a preparation method of a vanadium-doped iron oxyhydroxideelectrocatalyst, which comprises the following steps: FeCl3 6H2O, VCl3, CO (NH2)2 and NH4F are added into deionized water at the same time to obtain a clear solution A;. the clear solution A is poured into a reaction lining, and sealed, and the lining is fixed in an outer kettle, and placed in a homogeneous reactorfor hydrothermal reaction; After the reaction is finished, the reaction kettle is naturally cooled to room temperature, reaction solution is taken out;a product is collected by alternately centrifugally cleaning with water and absolute ethyl alcohol, poured into a mortar after vacuum drying and grinded into a fine powder sample, and a spherical vanadium-doped iron oxyhydroxideelectrocatalyst stacked by nano sheets is obtained.According to the preparation method, a high-efficiency, simple and low-cost one-step hydrothermal method is adopted to prepare the spherical vanadium-doped iron oxyhydroxideelectrocatalyst stacked by the nano sheets, so that the stability of the iron oxyhydroxide in the alkali liquor is effectively improved, and the electrolytic waterhydrogen and oxygen evolution performance of the iron oxyhydroxide in the alkali liquor is effectively improved.

Description

technical field [0001] The invention belongs to the field of electrocatalysts, in particular to a method for preparing an electrocatalyst material, in particular to a method for preparing a vanadium-doped iron oxyhydroxide electrocatalyst. Background technique [0002] As a new generation of green energy, hydrogen energy is widely regarded as a potential substitute for fossil fuels because of its high combustion calorific value, wide range of raw materials, and incineration products containing only non-polluting water. It provides a good choice for the development needs of the world today. . However, hydrogen deposits do not exist in nature, and hydrogen used in industrial applications is prepared chemically. As a sustainable means of hydrogen production, electrolyzed water has the following three advantages: (1) Two-thirds of the earth's surface is covered by the ocean, and the water reserves are very rich, which lays the foundation for the sustainable development of hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J37/10B82Y30/00B82Y40/00C25B11/06C25B1/04
CPCY02E60/36
Inventor 黄剑锋张晓冯亮亮曹丽云刘倩倩牛梦凡何枢薇
Owner SHAANXI UNIV OF SCI & TECH
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