CN110408947B - Nickel-cobalt oxide electrode material of composite silver oxide and preparation method and application thereof - Google Patents
Nickel-cobalt oxide electrode material of composite silver oxide and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a nickel-cobalt oxide electrode material of composite silver oxide and a preparation method and application thereof. The electrode material takes foamed nickel as a substrate, layered nickel hydroxide grows on the surface of the substrate, silver oxide nano particles are attached to the layered nickel hydroxide, nanowires grow on the lamella, and nickel-cobalt oxide nanoflowers grow on the nanowires. The preparation method of the material comprises the following steps: firstly, preparing a precursor salt solution in the first step, adding pretreated nickel foam, and generating silver-doped layered nickel hydroxide by adopting a hydrothermal method; preparing a precursor salt solution in the second step, adding the foamed nickel obtained in the first step, and generating silver-doped nickel-cobalt double hydroxide by adopting a hydrothermal method; finally, annealing in the air to obtain the nickel-cobalt oxide of the composite silver oxide. The invention realizes the combination of the surface active substance and the foam nickel substrate, and has simple preparation process, time saving, low energy consumption, energy saving and environmental protection; has larger active area and excellent oxygen evolution catalytic activity, and resists corrosion under alkaline conditions.
Description
Technical Field
The invention relates to a nickel-cobalt oxide electrode material of composite silver oxide and a preparation method and application thereof, belonging to the technical field of electrolytic water catalytic oxygen evolution.
Background
Energy is the fundamental driving force for the development of human productivity as a cornerstone for various production activities in the human society. From ancient times to the present, fossil energy, which is a main energy source utilized by human, is consumed at a rate that becomes faster and faster as human develops, and particularly, since the fossil energy enters an industrial society, the existing storage is about to be depleted over centuries. The consumption of fossil energy also brings environmental pollution problems, and therefore, the development of sustainable and clean alternative energy is urgent. Due to combustion of hydrogenThe process energy releases huge energy and the product is water, therefore, hydrogen is considered as a sustainable clean energy source. From the aspect of environmental friendliness, hydrogen production by electrochemically catalyzing and decomposing water is one of ideal ways for preparing hydrogen. The electrolytic water comprises an anodic oxygen generation reaction (OER) and a cathodic Hydrogen Evolution Reaction (HER), wherein the OER reaction is a kinetic slow process of four electron transfer and tends to consume higher energy. At present, noble metal based catalysts (RuO)2/IrO2) Is a high-efficiency oxygen-producing catalyst, however, the noble metal-based catalysts are expensive and have limited reserves, which limits the large-scale industrial application of the noble metal-based catalysts. Therefore, in order to meet the requirement of developing sustainable energy, it is important to develop and apply an efficient and cheap oxygen evolution catalyst to replace an expensive noble metal catalyst.
In recent years, some non-noble metals have been used as oxygen evolution catalysts, but the catalytic stability and catalytic performance cannot meet the requirements of industrial production. Therefore, the development of a non-noble metal catalyst which is low in cost, easy to prepare and high in performance has important significance for promoting the industrial development of the oxygen evolution reaction. Researches find that the oxygen evolution reaction under the alkaline condition has the advantages of no pollution, convenient operation, mature technology, easy large-scale production and the like, and becomes one of the research hotspots. However, the catalyst for oxygen evolution reaction under alkaline conditions has problems of poor catalytic activity and stability, and further research is required.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a silver-doped nickel-cobalt oxide electrode material, a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the nickel-cobalt oxide electrode material of the composite silver oxide is characterized in that foamed nickel is used as a substrate, layered nickel hydroxide grows on the surface of the foamed nickel, silver oxide nano particles are attached to the layered nickel hydroxide, nickel-cobalt oxide nano wires also grow on the layered nickel hydroxide, and nickel-cobalt oxide nano flowers grow on the nano wires.
The invention also provides a preparation method of the nickel-cobalt oxide electrode material of the composite silver oxide, which is characterized by comprising the following steps:
1) putting the foamed nickel into a silver nitrate solution, carrying out hydrothermal reaction, washing and drying a product to obtain a silver-doped layered nickel hydroxide electrode material;
2) preparing a precursor salt solution by taking nickel salt, cobalt salt, urea and deionized water as raw materials;
3) putting the silver-doped layered nickel hydroxide electrode material obtained in the step 1) into the precursor solution obtained in the step 2), performing hydrothermal reaction, and washing and drying a product to obtain a silver-doped nickel-cobalt double hydroxide electrode material;
4) annealing the silver-doped nickel-cobalt double hydroxide electrode material obtained in the step 3) in the air to obtain the silver oxide-compounded nickel-cobalt oxide electrode material.
According to the scheme, preferably, the concentration of the silver nitrate solution in the step 1) is 0.001-0.002 mol/L.
According to the scheme, preferably, the purity of the foamed nickel in the step 1) is more than 99.8 percent, and the areal density is 300-450g/cm2。
According to the scheme, preferably, the foamed nickel in the step 1) is pretreated for removing surface oil stains and oxide pollution layers, and is removed by an ultrasonic method after being soaked in an organic solvent and an acid solution. More preferably, the organic solvent is one or more of methanol, ethanol, tetrahydrofuran or chloroform, the acid is diluted hydrochloric acid, and the ultrasonic treatment time is 10-50 min.
According to the scheme, the temperature of the hydrothermal reaction in the step 1) is preferably 160 ℃, and the time is 6-8 hours.
According to the scheme, preferably, the nickel salt in the step 2) is nickel nitrate, nickel sulfate or nickel chloride; the cobalt salt is cobalt nitrate, cobalt sulfate or cobalt chloride. More preferably, the molar ratio of nickel salt to cobalt salt, urea is 1: 2: 3. more preferably, the dosage ratio of the nickel salt to the used deionized water is 0.05-0.1 mol: 1L of the compound.
According to the scheme, the temperature of the hydrothermal reaction in the step 3) is preferably 120 ℃, and the time is 6-8 hours.
According to the scheme, preferably, the annealing temperature in the step 4) is 250-350 ℃, and the heat preservation time is 2-3 h.
The invention also provides application of the nickel-cobalt oxide electrode material of the composite silver oxide, which is characterized in that the electrode material can be used as an electrode or a catalyst for preparing oxygen by electrolyzing water.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) according to the invention, the nickel foam is used as a substrate, and the hydrothermal method is adopted for preparation, so that the prepared electrode material has good corrosion resistance and controllable appearance; and the nickel-based metal has low price and stable catalytic performance under alkaline conditions.
(2) The preparation method of the nickel-cobalt oxide electrode material of the composite silver oxide, provided by the invention, has the advantages of simple process and low energy consumption in the preparation process, and is convenient for realizing industrial production.
(3) The nickel-cobalt oxide electrode material of the composite silver oxide prepared by the invention has unique appearance, is composed of zero-dimensional silver oxide nano particles, one-dimensional nano wires, two-dimensional nano sheets and three-dimensional nano flowers, can expose more active sites, and has larger active area.
(4) The nickel-cobalt oxide electrode material of the composite silver oxide prepared by the invention has higher catalytic activity. Compared with a pure nickel-cobalt oxide material, the electrode material provided by the invention has the current density of 10mA/cm2When the oxygen evolution performance is improved by 57 mv. Can be widely used as an alkaline electrolyzed water oxygen evolution electrode material and has wide application prospect.
Drawings
FIG. 1 is a scanning image of the surface morphology of the NiCoO/AgO/foam nickel composite electrode material prepared in example 1 of the present invention.
FIG. 2 is a scanned surface topography of NiCo LDH/foamed nickel electrode material prepared in comparative example 1 of the present invention.
FIG. 3 is a scanned surface topography of a NiCoO/foam nickel composite electrode material prepared in comparative example 2 of the present invention.
FIG. 4 is a linear sweep voltammetry curve of pure nickel foam obtained by the test of the present invention, composite electrode materials prepared in comparative examples 1-2 and example 1.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the following examples.
Example 1
A preparation method of NiCoO/AgO/foamed nickel composite electrode material comprises the following steps:
I. pretreatment of a foamed nickel substrate: selecting the cut 1X 3cm2The nickel foam (purity: 99.8%, areal density: 400 g/cm)2) Soaking in absolute ethyl alcohol, carrying out ultrasonic treatment for 15min, then using 2mol/L hydrochloric acid to carry out ultrasonic treatment for 15min, removing oil stains and oxide pollution layers on the surface, and finally washing the foam nickel substrate clean by deionized water.
II. Forming NiCo LDH/Ag (silver-doped nickel cobalt double hydroxide) on the pretreated foamed nickel through two-step hydrothermal reaction:
1) preparing a diluted silver nitrate solution: 0.5mL of silver nitrate solution with the concentration of 0.15mol/L is added into 39.5mL of deionized water to obtain diluted silver nitrate solution.
2) And (3) putting the foamed nickel substrate pretreated in the step (I) into the diluted silver nitrate solution, performing hydrothermal reaction for 6 hours in a high-pressure reaction kettle at 160 ℃, and washing and drying a product to obtain the foamed nickel material with the layered nickel hydroxide with the silver attached on the surface.
3) 2.5mmol of nickel chloride, 5mmol of cobalt nitrate and 7.5mmol of urea are dissolved in 30ml of deionized water to obtain a precursor salt solution.
4) And (3) putting the foamed nickel material with the surface growing with the layered nickel hydroxide attached with silver after hydrothermal reaction in the step 2) into the precursor salt solution, performing hydrothermal reaction in a high-pressure reaction kettle at 120 ℃ for 6h, and washing and drying the product after the reaction is finished to obtain the foamed nickel material with the surface growing with NiCo LDH/Ag.
III, annealing treatment: and (3) putting the foamed nickel material with the NiCo LDH/Ag growing on the surface obtained in the step (II) into a tube furnace, heating to 300 ℃ at the heating rate of 5 ℃/min in the air atmosphere, preserving the heat for 2h, and cooling to room temperature at the cooling rate of 5 ℃/min to obtain the NiCoO/AgO/foamed nickel composite electrode material.
Fig. 1 is a scanning electron microscope image of the surface morphology of the electrode material in which the layered nickel hydroxide with silver oxide attached thereto is grown on the foamed nickel prepared in this example, the nanowire is grown on the sheet layer, and the nickel-cobalt oxide nanoflower is grown on the nanowire.
Comparative example 1
Preparation of a NiCo LDH/foamed nickel electrode material, which comprises the following steps:
I. pretreatment of a foamed nickel substrate: the procedure is as in step I of example 1.
II. Hydrothermal reaction on pretreated nickel foam to form NiCo LDH:
2.5mmol of nickel chloride, 5mmol of cobalt nitrate and 7.5mmol of urea are dissolved in 30ml of deionized water to obtain a precursor salt solution. And (3) putting the foamed nickel substrate pretreated in the step (I) into the precursor salt solution, performing hydrothermal reaction for 6 hours at 120 ℃ in a high-pressure reaction kettle, and washing and drying a product after the reaction is finished to obtain the foamed nickel material with the linear NiCo LDH growing on the surface.
FIG. 2 is a scanning electron microscope image of the surface morphology of the NiCo LDH/foamed nickel composite nanomaterial prepared in this comparative example 1.
Comparative example 2
A preparation method of NiCoO/foamed nickel composite electrode material comprises the following steps:
I. pretreatment of a foamed nickel substrate: the procedure is as in comparative example 1, step I.
II. Hydrothermal reaction on pretreated nickel foam to form NiCo LDH: the procedure is as in step II of comparative example 1.
III, annealing to form NiCoO: and (3) putting the NiCo LDH/foamed nickel obtained by the hydrothermal method in the step (II) into a tube furnace, heating to 300 ℃ at the heating rate of 5 ℃/min in the air atmosphere, preserving the heat for 2h, and cooling to room temperature at the cooling rate of 5 ℃/min.
FIG. 3 is a scanning electron microscope image of the surface morphology of the NiCoO/foam nickel electrode material prepared in this comparative example 2.
And (4) analyzing results:
as is clear from the scanning electron micrographs of fig. 1 to 3, in comparative example 1, nanowires of nickel cobalt double hydroxide were uniformly grown on nickel foam; in comparative example 2, the nanowires were uniformly grown on the nickel foam, and nanoflowers of nickel-cobalt oxide were grown on the nanowires; in example 1, layered nickel hydroxide attached with silver oxide is grown on the nickel foam, nanowires are grown on the sheet layer, and nanoflowers of nickel-cobalt oxide are grown on the nanowires, so that the active area and catalytic activity of the material can be greatly increased.
And (3) effect testing:
the electrode materials prepared in the comparative examples 1-2 and the example 1 are used as electrolytic water electrodes for catalytic oxygen generation by electrolytic water, and pure nickel foam is used as a blank control.
The pure nickel foam and the composite electrode materials prepared respectively in the three examples are subjected to a linear sweep voltammetry curve test:
in the testing process, a three-electrode system is adopted, 1mol/L KOH is used as electrolyte, a carbon rod is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, foamed nickel and composite electrode materials prepared in three embodiments are respectively used as working electrodes in sequence for testing, the foamed nickel and the composite electrode materials prepared in the three embodiments are guaranteed to have the same geometric area, and the testing result is shown in figure 4.
As can be seen from FIG. 4, when the current density was 10mA/cm2Compared with pure nickel foam, the performance of the silver-doped nickel-cobalt oxide electrode material is greatly improved. As can be seen from the above comparison, when the silver-doped nickel cobalt oxide electrode material prepared in example 1 of the present invention is used as a catalyst for water electrolysis, the silver-doped nickel cobalt oxide electrode material is compared with the nickel cobalt dihydroxide prepared in comparative example 1Compared with the nickel foam material of nickel cobalt oxide prepared in comparative example 2, the oxide has large active area and excellent catalytic performance, and is hopeful to replace noble metal catalyst in the field of oxygen production by electrolyzing water.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The nickel-cobalt oxide electrode material of the composite silver oxide is characterized in that foamed nickel is used as a substrate, layered nickel hydroxide grows on the surface of the foamed nickel, silver oxide nano particles are attached to the layered nickel hydroxide, nickel-cobalt oxide nano wires also grow on the layered nickel hydroxide, and nickel-cobalt oxide nano flowers grow on the nano wires.
2. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 1, comprising the steps of:
1) putting the foamed nickel into a silver nitrate solution, carrying out hydrothermal reaction, washing and drying a product to obtain a silver-doped layered nickel hydroxide electrode material;
2) preparing a precursor salt solution by taking nickel salt, cobalt salt, urea and deionized water as raw materials;
3) putting the silver-doped layered nickel hydroxide electrode material obtained in the step 1) into the precursor solution obtained in the step 2), performing hydrothermal reaction, and washing and drying a product to obtain a silver-doped nickel-cobalt double hydroxide electrode material;
4) annealing the silver-doped nickel-cobalt double hydroxide electrode material obtained in the step 3) in the air to obtain the silver oxide-compounded nickel-cobalt oxide electrode material.
3. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 2, wherein the concentration of the silver nitrate solution in the step 1) is 0.001-0.002 mol/L.
4. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide as claimed in claim 2, wherein the purity of the nickel foam in step 1) is more than 99.8%, and the surface density is 300-450g/cm2。
5. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 2, wherein the temperature of the hydrothermal reaction in the step 1) is 160 ℃ and the time is 6-8 h.
6. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 2, wherein the nickel salt in step 2) is nickel nitrate, nickel sulfate or nickel chloride; the cobalt salt is cobalt nitrate, cobalt sulfate or cobalt chloride.
7. The method for preparing a nickel cobalt oxide electrode material of composite silver oxide according to claim 6, wherein the molar ratio of the nickel salt to the cobalt salt and urea is 1: 2: 3; the dosage ratio of the nickel salt to the used deionized water is 0.05-0.1 mol: 1L of the compound.
8. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 2, wherein the temperature of the hydrothermal reaction in the step 3) is 120 ℃ and the time is 6-8 h.
9. The method for preparing the nickel cobalt oxide electrode material of composite silver oxide according to claim 2, wherein the annealing temperature in the step 4) is 250-350 ℃, and the holding time is 2-3 h.
10. The use of the nickel cobalt oxide electrode material of silver oxide composite of claim 1, wherein the electrode material is used as an electrode or catalyst for the electrolysis of water to produce oxygen.
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| CN115505958B (en) * | 2022-09-30 | 2025-04-04 | 武汉工程大学 | Preparation and application of metal foam-supported double spinel oxide CuCo2O4-Co3O4 and its derivatives |
| CN115478282A (en) * | 2022-09-30 | 2022-12-16 | 武汉工程大学 | Preparation method and application of silver-doped nickel-molybdenum oxide composite material and derivative thereof |
| CN115652356A (en) * | 2022-11-15 | 2023-01-31 | 海卓动力(北京)能源科技有限公司 | A kind of vanadium-cobalt-nickel ternary phosphide and its preparation method and application |
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