Preparation method of cobalt vanadium duplex-metal hydroxide nanosheet as catalyst in electrolysis of water for oxygen evolution

A technology of hydroxides and nanosheets, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high energy consumption, high risk, and high temperature. Achieve the effects of no post-processing, low synthesis temperature, and excellent electrochemical performance

Inactive Publication Date: 2018-07-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrothermal Synthesis of Nanorods and Nanowires of Mg / AlLayered Double Hydroxides. Zhao et al. used the hydrothermal method to synthesize LDH nanowires at 190°C. The product was regular and well dispersed. However, this method had a high temperature and high energy consumption. and has a certain risk

Method used

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  • Preparation method of cobalt vanadium duplex-metal hydroxide nanosheet as catalyst in electrolysis of water for oxygen evolution
  • Preparation method of cobalt vanadium duplex-metal hydroxide nanosheet as catalyst in electrolysis of water for oxygen evolution
  • Preparation method of cobalt vanadium duplex-metal hydroxide nanosheet as catalyst in electrolysis of water for oxygen evolution

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Experimental program
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Effect test

Embodiment 1

[0022] 1) Take cobalt chloride hexahydrate, vanadium chloride and hexamethylenetetramine simultaneously and add them to 30ml of deionized water at room temperature under magnetic stirring to obtain a clear solution A with a cobalt salt concentration of 0.0426mol / L;

[0023] The molar ratio of cobalt chloride hexahydrate: vanadium chloride: hexamethylenetetramine is 1.28:0.32:2;

[0024] 2) Pour the clear solution A of step 1) into the reaction lining at a filling ratio of 60% and then seal it, then put the lining in an outer kettle and place it in a homogeneous reactor for 12 hours at 120°C;

[0025] 3) After the hydrothermal reaction is completed, the reaction kettle is naturally cooled to room temperature, and the reacted product is washed alternately with water and alcohol three times, then the product is collected and vacuum dried at 35° C. for 10 hours to obtain CoV-LDH nanosheets.

Embodiment 2

[0027] 1) Take cobalt chloride hexahydrate, vanadium chloride and hexamethylenetetramine simultaneously and add them to 25ml of deionized water at room temperature under magnetic stirring to obtain a clear solution A with a cobalt salt concentration of 0.0276mol / L;

[0028] The molar ratio of cobalt chloride hexahydrate: vanadium chloride: hexamethylenetetramine is 1.2:0.4:0.5;

[0029] 2) Pour the clear solution A from step 1) into the reaction lining at a filling ratio of 20% and then seal it, then put the lining in an outer kettle and place it in a homogeneous reactor for 24 hours at 80°C;

[0030] 3) After the hydrothermal reaction is completed, the reaction kettle is naturally cooled to room temperature, and the reacted product is washed alternately with water and alcohol three times, then the product is collected and vacuum dried at 25° C. for 12 hours to obtain CoV-LDH nanosheets.

Embodiment 3

[0032] 1) Take cobalt chloride hexahydrate, vanadium chloride and hexamethylenetetramine simultaneously and add them to 20ml of deionized water under magnetic stirring at room temperature to obtain a clear solution A with a cobalt salt concentration of 0.053mol / L;

[0033] The molar ratio of cobalt chloride hexahydrate: vanadium chloride: hexamethylenetetramine is 1.067:0.53:1.5;

[0034] 2) Pour the clear solution A of step 1) into the reaction liner at a filling ratio of 40% and then seal it, then put the liner in an outer kettle and place it in a homogeneous reactor for 10 hours at 150°C;

[0035] 3) After the hydrothermal reaction is completed, the reaction kettle is naturally cooled to room temperature, and the reacted product is washed alternately with water and alcohol three times, then the product is collected and vacuum dried at 30° C. for 12 hours to obtain CoV-LDH nanosheets.

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Abstract

The invention relates to a preparation method of a cobalt vanadium duplex-metal hydroxide nanosheet as a catalyst in electrolysis of water for oxygen evolution. The preparation method includes the steps that cobalt chloride hexahydrate, vanadium chloride and hexamethylenetetramine are simultaneously added into deionized water to obtain a solution A; the solution A is poured into a reaction still and then sealed, the reaction still is placed in an outer kettle, and then the outer kettle is placed in a homogeneous reactor for a reaction; after the reaction is completed, the reaction still is naturally cooled to room temperature, and a product obtained after the reaction is alternately washed with water and alcohol, collected and dried under vacuum to obtain the CoV-LDH nanosheet. A one-stephydrothermal method is adopted, the synthesis temperature is low, the yield is high, no post-treatment is needed, and the environment is protected. The prepared CoV-LDH is a two-dimensional nanosheetwhich is beneficial to free ion in and out, full contact of an electrolyte and the CoV-LDH nanosheet is facilitated, more active sites can be exposed, and correspondingly the electrochemical performance can be improved. In addition, the chemical composition of the product is uniform, the purity is high, the morphology is uniform, the nanosheet can show excellent electrochemical performance when used as an electrode material in electrolysis of water, and at the current density of 10mA / cm<2>, the overpotential is about 280 mV.

Description

Technical field [0001] The invention belongs to the technical field of electrocatalysts, and specifically relates to a preparation method of a cobalt-vanadium double metal hydroxide nanosheet electrolysis water oxygen evolution catalyst. Background technique [0002] Hydrogen energy is a clean, efficient, and pollution-free energy source, and because of its high energy density, it is widely used as an energy carrier. Splitting water into hydrogen and oxygen is considered one of the most promising strategies for producing hydrogen. The electrochemical oxygen evolution reaction (OER) is a process that determines the efficiency of water splitting. OER is a multi-step, four-electron, slow kinetic reaction and requires a higher overpotential process. Designing an efficient OER catalyst can improve reaction kinetics and reduce overvoltage. Noble metal oxide (IrO 2 And RuO 2 ) Are considered the most effective OER catalysts for water splitting, but they are scarce and expensive. Rec...

Claims

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Application Information

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IPC IPC(8): B01J23/847C25B1/04C25B11/06
CPCB01J23/8472C25B1/04C25B11/04Y02E60/36
Inventor 黄剑锋刘倩倩冯亮亮曹丽云杨丹何丹阳
Owner SHAANXI UNIV OF SCI & TECH
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