CN111977708B - Preparation method of nitrogen-doped transition metal sulfide and application of nitrogen-doped transition metal sulfide in water electrolysis - Google Patents

Preparation method of nitrogen-doped transition metal sulfide and application of nitrogen-doped transition metal sulfide in water electrolysis Download PDF

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CN111977708B
CN111977708B CN202010580661.1A CN202010580661A CN111977708B CN 111977708 B CN111977708 B CN 111977708B CN 202010580661 A CN202010580661 A CN 202010580661A CN 111977708 B CN111977708 B CN 111977708B
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杨文书
徐江玉
贾佳
罗威
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Abstract

The invention belongs to the technical field of composite material synthesis, relates to preparation of sulfides, and in particular relates to a preparation method of nitrogen-doped transition metal sulfides, which comprises the following steps: deionized water is used as a solvent to prepare transition metal salt solutions with the molar concentration of 0.05-0.2 mol/L and hydrazine hydrate solutions with the mass percentage concentration of 2 percent respectively; according to the volume ratio of the transition metal salt solution to the hydrazine hydrate solution of 3-1: 1, mixing and standing for 3-4 hours to form sol and centrifuging; transferring the precursor into a crucible, placing the crucible into an upper air port of a tube furnace, placing sublimated sulfur into a lower air port of the tube furnace, heating to 300-500 ℃, calcining for 30-60 min in an inert atmosphere, and naturally cooling to room temperature to obtain the catalyst. The operation process is simple and feasible, the prepared material electrode has better electrochemical performance and stability, the raw materials are cheap and easy to obtain, the material electrode is nontoxic, the condition is mild and controllable, the material electrode is suitable for large-scale industrial production, can be directly used as an electrode for electrocatalytic decomposition water oxygen evolution reaction, and can also be suitable for preparation of other nitrogen doped sulfides.

Description

Preparation method of nitrogen-doped transition metal sulfide and application of nitrogen-doped transition metal sulfide in water electrolysis
Technical Field
The invention belongs to the technical field of composite material synthesis, relates to sulfide preparation, and in particular relates to a preparation method of nitrogen-doped transition metal sulfide and application of the nitrogen-doped transition metal sulfide in electrolysis of water.
Background
Hydrogen is a future clean energy source, and electrolyzed water is a high-efficiency, low-cost and environment-friendly hydrogen production method, and mainly comprises an electrocatalytic Hydrogen Evolution Reaction (HER) and an Oxygen Evolution Reaction (OER), wherein OER is a rapid control step and is a bottleneck for limiting the hydrogen production conversion efficiency of electrolyzed water. The key to improve the conversion efficiency is to introduce a high-efficiency OER catalyst, reduce the reaction potential energy and improve the catalytic reaction rate. Current noble metal IrO 2 、RuO 2 Still being the best OER catalysts, but limited by their high cost and low reserves, make water electrolysis hydrogen production technology impractical for large scale commercial application.
With the intensive research of electrolyzed water, the transition metal-based (iron, cobalt, nickel and the like) electrocatalytic material has the advantages of environmental friendliness, no toxicity, rich reserves, thermodynamic stability and low cost, and is widely applied to the field of electrolyzed water. Single transition metal sulfides have proven to perform poorly and doping is considered an effective method of improving OER performance of single transition metal sulfides because doping can optimize the electronic structure, enhancing conductivity and charge transfer capability. However, the current doping methods involve high temperature calcination and use of some highly polluting chemicals as nitrogen sources. Therefore, it is important to find a nitrogen doping method with mild conditions and controllable reaction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to disclose a preparation method of nitrogen-doped transition metal sulfide.
A preparation method of nitrogen-doped transition metal sulfide comprises the following steps:
A. deionized water is used as a solvent to prepare transition metal salt solutions with the molar concentration of 0.05-0.2 mol/L and hydrazine hydrate solutions with the mass percentage concentration of 2 percent respectively;
B. according to the volume ratio of the transition metal salt solution to the hydrazine hydrate solution of 3-1: 1, preferably 2:1, pouring the hydrazine hydrate solution into a transition metal salt solution, standing for 3-4 h to form sol, centrifuging, and drying the obtained precursor for later use;
C. transferring the precursor into a crucible, placing the crucible into an upper air port of a tube furnace, placing sublimated sulfur into a lower air port of the tube furnace, heating to 300-500 ℃ at a speed of 10 ℃/min, calcining and preserving heat for 30-60 min under the protection of inert gas, and naturally cooling to room temperature to obtain the nitrogen-doped transition metal sulfide, wherein the mass ratio of the precursor to the sublimated sulfur is 1:2-10, preferably 1:5.
in a preferred embodiment of the present invention, the transition metal salt in the step a is a nitrate, chloride or sulfate of a transition metal.
Further, the nitrate is nickel nitrate, cobalt nitrate, ferric nitrate, copper nitrate, aluminum nitrate, zinc nitrate, vanadium nitrate, molybdenum nitrate, chromium nitrate and the like; the chloride salt is nickel chloride, cobalt chloride, ferric chloride, cupric chloride, aluminum chloride, zinc chloride, vanadium chloride, molybdenum chloride, chromium chloride and the like; the sulfate is nickel sulfate, cobalt sulfate, ferric sulfate, copper sulfate, aluminum sulfate, zinc sulfate, vanadium sulfate, molybdenum sulfate, chromium sulfate, etc.
In the preferred embodiment of the invention, the rotating speed in the step B is 5000-8000 r/min.
In a preferred embodiment of the present invention, the inert gas in the step C is high-purity nitrogen or argon.
The nitrogen doped transition metal sulfide prepared by the method has the morphology of coarse solid pellets of 20-30 nm, and is easy to disperse in water and ethanol.
Sulfides are prone to forming oxyhydroxide during the course of vigorous electrochemical oxidation, which is considered an active species for electrocatalytic oxygen evolution, and studies have shown that the activity of directly synthesized oxyhydroxide is much lower than sulfide conversion. The nitrogen doping can change the electron cloud density of metal atoms and reduce the energy barrier in the oxygen desorption process.
Another object of the present invention is to apply the prepared nitrogen-doped transition metal sulfide to a positive electrode material for water electrolysis.
Electrocatalytic activity experiments of transition metal nitrogen doped sulfides:
(1) The concentration is 1 mol.L -1 KOH solution, seal and place in dark;
(2)adopts CHI660 electrochemical workstation (Shanghai Chen Hua instruments Co., ltd.) in a three-electrode system, platinum sheet as counter electrode, mercury/oxidized mercury electrode (Hg/HgO) as reference electrode, and composite material as working electrode at 1 mol.L -1 The electrochemical performance of transition metal nitrogen doped sulfides was tested in KOH electrolyte using Linear Sweep Voltammetry (LSV).
Advantageous effects
The invention uses hydrazine hydrate as nitrogen source to carry out coordination reaction with metal in room temperature liquid phase, which is suitable for doping various transition metals. When used as a water oxidation catalyst, a lower overpotential can be obtained. The operation process is simple and feasible, the prepared material electrode has better electrochemical performance and stability, the raw materials are cheap and easy to obtain, the material electrode is nontoxic, the condition is mild and controllable, the material electrode is suitable for large-scale industrial production, and the material electrode can be directly used as an electrode for the electrocatalytic decomposition water oxygen evolution reaction. The preparation method of the nitrogen-doped sulfide disclosed by the invention is also suitable for preparing other nitrogen-doped sulfides.
Drawings
Figure 1 XRD pattern of nitrogen doped cobalt sulphide,
figure 2 XRD pattern of nitrogen doped nickel sulfide,
figure 3 linear voltammograms of nitrogen doped nickel sulfide and cobalt sulfide,
fig. 4 active areas of nitrogen doped nickel sulfide and cobalt sulfide.
Detailed Description
The present invention will be described in detail with reference to the following examples, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following examples.
Unless otherwise defined, terms (including technical and scientific terms) used herein should be interpreted to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Example 1
A method for preparing a nitrogen-doped transition metal sulfide, comprising:
weighing 0.0015 mol of cobalt chloride solution, dissolving in 20mL of deionized water, and magnetically stirring until the cobalt chloride solution is completely dissolved to form a solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, setting 5000r/min, centrifuging for 5min, transferring the obtained precipitate into a crucible after centrifuging, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 400 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 60min, and after the material is naturally cooled to room temperature, the nitrogen doped cobalt sulfide is obtained.
As can be seen from fig. 1, the diffraction peaks are not aligned, demonstrating successful doping of nitrogen element;
as can be seen from fig. 2, the diffraction peaks are not aligned, demonstrating successful doping of the nitrogen element;
the excellent electrochemical water oxidation performance is demonstrated by fig. 3;
the active areas of nickel sulfide and cobalt sulfide are doped with nitrogen from fig. 4.
The prepared nitrogen doped cobalt sulfide is applied to an electrolyzed water anode material, and the current density is 10 mA.cm -2 The time overpotential reaches 270mV, and the Tafil slope is 43 mV -1
Example 2
A method for preparing a nitrogen-doped transition metal sulfide, comprising:
weighing 0.0015 mol of nickel chloride solution, dissolving in 20mL of deionized water, and magnetically stirring until the nickel chloride solution is completely dissolved to form a solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, setting 5000r/min, centrifuging for 5min, transferring the obtained precipitate into a crucible after centrifuging, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 350 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 40min, and after the material is naturally cooled to room temperature, the nitrogen-doped nickel sulfide is obtained.
The prepared nitrogen doped cobalt sulfide is applied to an electrolyzed water anode material, and the current density is 10 mA.cm -2 The time overpotential reaches 275mV, and the Tafil slope is 47 mV -1
Example 3
A method for preparing a nitrogen-doped transition metal sulfide, comprising:
weighing 0.003 mol of ferric chloride solution, dissolving in 20mL of deionized water, and magnetically stirring until the ferric chloride solution is completely dissolved to form a solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 30 min, and after the material is naturally cooled to room temperature, the nitrogen-doped ferric sulfide is obtained.
The prepared nitrogen doped cobalt sulfide is applied to water electrolysisThe positive electrode material had a current density of 10 mA.cm -2 The time overpotential reaches 260mV, and the Tafil slope is 63 mV.dec -1
Example 4
A method for preparing a nitrogen-doped transition metal sulfide, comprising:
weighing 0.001 mol of nickel chloride and 0.001 mol of ferric chloride solution, dissolving in 20mL of deionized water, and magnetically stirring until the nickel chloride and the ferric chloride are fully dissolved to form solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the heat is preserved for 30 min, and after the nitrogen doped ferronickel sulfide is naturally cooled to room temperature, the nitrogen doped ferronickel sulfide is obtained.
The prepared nitrogen doped cobalt sulfide is applied to an electrolyzed water anode material, and the current density is 10 mA.cm -2 The time overpotential reaches 210mV, and the Tafil slope is 57 mV -1
Example 5
A method for preparing a nitrogen-doped transition metal sulfide, comprising:
weighing 0.003 mol of nickel nitrate solution, dissolving in 20mL of deionized water, and magnetically stirring until the solution is completely dissolved to form solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 30 min, and after the material is naturally cooled to room temperature, the nitrogen-doped nickel sulfide is obtained.
The prepared nitrogen-doped nickel sulfide is applied to an electrolytic water positive electrode material, and the current density is 10 mA.cm -2 The time overpotential reaches 275mV, and the Tafil slope is 58 mV -1
Example 6
Weighing 0.003 mol of copper sulfate solution, dissolving in 20mL of deionized water, and magnetically stirring until the copper sulfate solution is completely dissolved to form a solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the heat is preserved for 30 min, and after the material is naturally cooled to room temperature, the nitrogen-doped copper sulfide is obtained.
The prepared nitrogen-doped copper sulfide is applied to an electrolytic water positive electrode material, and the current density is 10 mA.cm -2 The time overpotential reaches 310mV, and the Tafil slope is 75mV -1
Example 7
Weighing 0.002 mol of zinc sulfate solution, dissolving in 20mL of deionized water, and magnetically stirring until the solution is completely dissolved to form solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 30 min, and after the material is naturally cooled to room temperature, the nitrogen-doped zinc sulfide is obtained.
The prepared nitrogen doped zinc sulfide is applied to an electrolytic water positive electrode material, and the current density is 10 mA.cm -2 The time overpotential reaches 310mV, and the Tafil slope is 75mV -1
Example 8
Weighing 0.002 mol of chromium sulfate solution, dissolving in 20mL of deionized water, and magnetically stirring until the chromium sulfate solution is completely dissolved to form a solution A;
10mL of deionized water is measured, and 20uL of 30% hydrazine hydrate is added to the solution to form a solution B;
pouring the obtained solution B into the solution A, and standing for about 4 hours at room temperature to form a liquid sol C;
transferring the sol C into a centrifuge tube, and centrifuging for 5min at 5000 r/min. After centrifugation is completed, transferring the obtained precipitate into a crucible, and drying in an oven; transferring the obtained precipitate into a crucible, and drying in an oven;
after drying, 0.1g of precursor is transferred into a crucible and placed at an upper air port of a tube furnace, then 0.5g of sublimed sulfur is weighed and placed at a lower air port of the crucible, then the tube furnace is arranged, the temperature is kept at a programmed temperature of 10 ℃/min to 500 ℃, calcination is carried out under the protection of inert gas, the temperature is kept for 30 min, and after the material is naturally cooled to room temperature, the nitrogen-doped chromium sulfide is obtained.
The prepared nitrogen doped chromium sulfide is applied to the electrolytic water positive pole materialThe material has a current density of 10 mA.cm -2 The time overpotential reaches 290mV, and the Tafil slope is 65 mV -1
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (8)

1. The preparation method of the nitrogen-doped transition metal sulfide is characterized by comprising the following steps of:
A. deionized water is used as a solvent to prepare transition metal salt solutions with the molar concentration of 0.05-0.2 mol/L and hydrazine hydrate solutions with the mass percentage concentration of 2 percent respectively;
B. pouring the hydrazine hydrate solution into the transition metal salt solution according to the volume ratio of the transition metal salt solution to the hydrazine hydrate solution of 3-1:1, standing for 3-4 h to form sol, centrifuging, and drying the obtained precursor for later use;
C. transferring the precursor into a crucible, placing the crucible into an upper air port of a tube furnace, placing sublimated sulfur into a lower air port of the tube furnace, heating to 300-500 ℃ at a speed of 10 ℃/min, calcining under the protection of inert gas, preserving heat for 30-60 min, and naturally cooling to room temperature to obtain the nitrogen-doped transition metal sulfide, wherein the mass ratio of the precursor to the sublimated sulfur is 1:2-10.
2. The method for producing a nitrogen-doped transition metal sulfide according to claim 1, wherein: the transition metal salt in the step A is nitrate, chloride or sulfate of transition metal.
3. The method for producing a nitrogen-doped transition metal sulfide according to claim 2, characterized in that: and (C) the nitrate in the step A is nickel nitrate, cobalt nitrate, ferric nitrate, copper nitrate, aluminum nitrate, zinc nitrate, vanadium nitrate, molybdenum nitrate and chromium nitrate.
4. The method for producing a nitrogen-doped transition metal sulfide according to claim 2, characterized in that: and the chloride salt in the step A is nickel chloride, cobalt chloride, ferric chloride, cupric chloride, aluminum chloride, zinc chloride, vanadium chloride, molybdenum chloride and chromium chloride.
5. The method for producing a nitrogen-doped transition metal sulfide according to claim 2, characterized in that: the sulfate in the step A is nickel sulfate, cobalt sulfate, ferric sulfate, copper sulfate, aluminum sulfate, zinc sulfate, vanadium sulfate, molybdenum sulfate and chromium sulfate.
6. The method for producing a nitrogen-doped transition metal sulfide according to claim 1, wherein: and B, the volume ratio of the transition metal salt solution to the hydrazine hydrate solution is 2:1.
7. The method for producing a nitrogen-doped transition metal sulfide according to claim 1, wherein: and C, the inert gas is high-purity nitrogen or argon.
8. The method for producing a nitrogen-doped transition metal sulfide according to claim 1, wherein: and C, the mass ratio of the precursor to the sublimated sulfur is 1:5.
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