CN111468144A - MoS2/MoO2Ru composite material and preparation method and application thereof - Google Patents

MoS2/MoO2Ru composite material and preparation method and application thereof Download PDF

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CN111468144A
CN111468144A CN202010425463.8A CN202010425463A CN111468144A CN 111468144 A CN111468144 A CN 111468144A CN 202010425463 A CN202010425463 A CN 202010425463A CN 111468144 A CN111468144 A CN 111468144A
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composite material
water
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CN111468144B (en
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刘玉山
蔡佳琳
吕华伦
谢鑫
黄玉明
李勇盛
范云霄
刘乐妍
丁洁
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Zhengzhou University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/30Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/33Electric or magnetic properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/02Sulfur, selenium or tellurium; Compounds thereof
    • B01J27/04Sulfides
    • B01J27/047Sulfides with chromium, molybdenum, tungsten or polonium
    • B01J27/051Molybdenum
    • B01J27/0515Molybdenum with iron group metals or platinum group metals
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00Electrolytic production of inorganic compounds or non-metals
    • C25B1/01Products
    • C25B1/02Hydrogen or oxygen
    • C25B1/04Hydrogen or oxygen by electrolysis of water
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/073Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
    • C25B11/091Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
    • C25B11/093Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds at least one noble metal or noble metal oxide and at least one non-noble metal oxide
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
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Abstract

The invention belongs to the technical field of electro-catalysis hydrogen production, and discloses a MoS2/MoO2a/Ru composite material, a preparation method and application thereof. The preparation method comprises the following steps: mixing the nano MoS2Adding into water, performing ultrasonic dispersion under ice bath condition, and then placing the mixed solution subjected to ultrasonic dispersion into a cell crushing instrument for ultrasonic treatment for at least 30 min; adding water-soluble Ru salt and H with the concentration of 4-6 wt% into the obtained mixed solution in sequence2O2Stirring uniformly, controlling the temperature to be 80-95 ℃ for reaction for 4-6h, centrifuging, washing and drying to obtain MoS2/RuO2A composite material; the prepared MoS2/RuO2The composite material is fully and uniformly ground, and the grinding speed is N2Calcining at 400-800 ℃ for 3-6 h in the atmosphere of gas or inert gas, and naturally cooling to room temperature to obtain MoS2/MoO2A/Ru composite material. The composite material is used as a catalyst for electrocatalytic hydrogen evolution reaction. MoS prepared by the method of the invention2/MoO2the/Ru composite material has uniform appearance and excellent electrocatalytic performance, and meanwhile, in the preparation process, the reaction condition is simple, the operation is easy, the yield is high, and the industrial production is easy.

Description

MoS2/MoO2Ru composite material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of electro-catalysis hydrogen production, and particularly relates to MoS2/MoO2a/Ru composite material, a preparation method and application thereof.
Background
Hydrogen energy has attracted much attention as a competitive clean energy candidate. In addition to this, more than 6000 million tons of hydrogen are used annually for different industrial uses, involving synthetic ammonia production, hydrocracking and fossil fuel refining. However, more than 95% of the hydrogen comes from coal gasification or steam methane reforming, which results in high energy consumption and large carbon dioxide emissions. Electrochemical water splitting is a more sustainable method to produce hydrogen, and then electrical energy can be stored in the chemical bonds of hydrogen, which provides a better method for low cost electricity using existing renewable energy sources. The heart of the Hydrogen Evolution Reaction (HER) is to find an efficient catalyst-triggered reaction.
Disclosure of Invention
Aiming at overcoming the defects in the prior art, the invention aims to provide a MoS2/MoO2a/Ru composite material, a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a composite material is prepared from MoS2、MoO2And Ru.
The preparation method of the composite material comprises the following steps:
(1)、MoS2/RuO2preparing a composite material:
mixing the nano MoS2Adding into water, performing ultrasonic dispersion under ice bath condition, and then placing the mixed solution subjected to ultrasonic dispersion into a cell crushing instrument for ultrasonic treatment for at least 30 min; adding water-soluble Ru salt and H with the concentration of 4-6 wt% into the obtained mixed solution in sequence2O2Stirring uniformly, controlling the temperature to be 80-95 ℃ for reaction for 4-6h, centrifuging, washing and drying to obtain MoS2/RuO2A composite material; wherein the molar weight of the water-soluble Ru salt is measured by the molar weight of Ru element contained in the water-soluble Ru salt, and the MoS is nano2The molar ratio of the water-soluble Ru salt to the water-soluble Ru salt is more than 1: 3, and the addition amount of water is 30-60 m L/0.2 g of nano MoS2,H2O2The addition amount of (A) is 2-4 m L/0.6 mmol water-soluble Ru salt;
(2)、MoS2/MoO2preparation of the/Ru composite material:
the MoS prepared in the step (1) is added2/RuO2The composite material is fully and uniformly ground, and the grinding speed is N2Calcining at 400-800 ℃ for 3-6 h in the atmosphere of gas or inert gas, and naturally cooling to room temperature to obtain MoS2/MoO2A/Ru composite material.
Preferably, in the step (1), the nano MoS2Is MoS2And (4) nano flowers.
Preferably, in the step (1), the water-soluble Ru salt is RuCl3·3H2O。
Preferably, in the step (1), the drying temperature is 60-80 ℃ and the drying time is 8-12 h.
Preferably, in the step (2), the temperature is raised at a rate of 5 to 10 ℃/min during the calcination.
The composite material is used as a catalyst for electrocatalytic hydrogen evolution reaction.
In the invention, the nano MoS2Can be prepared according to the prior art. The invention utilizes brand new solid phase reaction to prepare MoS2/MoO2Composite materials of/Ru, i.e. MoS2/RuO2After the composite material is calcined, the oxidation-reduction reaction between two solid substances occurs, and the reaction equation is as follows:
MoS2+ 3 RuO2= MoO2+ 2 Ru + 2 SO2↑。
MoS prepared by the method of the invention2/MoO2the/Ru composite material has uniform appearance and excellent electrocatalytic performance, and meanwhile, in the preparation process, the reaction condition is simple, the operation is easy, the yield is high, and the industrial production is easy.
Drawings
FIG. 1: MoS prepared in example 12、MoS2/RuO2Composite material and MoS2/MoO2XRD pattern of the/Ru composite.
FIG. 2: MoS prepared in example 12/MoO2SEM image of/Ru composite.
FIG. 3: MoS corresponding to FIG. 22/MoO2EDS diagram of the/Ru composite.
FIG. 4: MoS prepared in example 12/RuO2Temperature-variable XRD patterns of the composite materials.
FIG. 5: MoS prepared in example 12/MoO2Schematic diagram of electrocatalytic hydrogen generation performance of the/Ru composite material under different PH conditions.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
MoS2/MoO2The preparation method of the/Ru composite material comprises the following steps:
(1) nano MoS2The preparation of (1):
preparing 3D flower-shaped nano molybdenum disulfide by using ammonium molybdate tetrahydrate and thiourea as raw materials: 0.2 g PVP (K-30) was dissolved in 100 ml deionized water,1.22 g (NH)4)6Mo7O24·4H2O and 1.78 g NH2CSNH2Adding into the above solution, and stirring for 30 min to obtain clear solution; transferring the solution into a 200 ml high-pressure reaction kettle, reacting at 200 ℃ for 24 h, cooling, separating out precipitate by a centrifuge, alternately washing with ethanol and deionized water for three times, and drying the product in a vacuum drying oven at 60 ℃ for 12 h to obtain 3D flower-shaped nano molybdenum disulfide;
(2)、MoS2/RuO2preparing a composite material:
0.2 g of MoS prepared in step (1) was taken2Dispersing in 40 ml deionized water, performing ultrasonic treatment for 3 h under ice bath condition, then placing the ultrasonic dispersed mixed solution in a cell pulverizer, performing ultrasonic treatment for 30 min, and taking 0.1308 g RuCl3·3H2Adding O into the mixed solution; 3 ml of 30 wt% H was taken2O2Adding deionized water to dilute to 20 ml, and adding 20 ml of H2O2Slowly dropping the diluent into the mixed solution in which ruthenium trichloride is fully dissolved, fully and uniformly stirring, transferring the solution into a 100 ml high-pressure reaction kettle, reacting for 5 h at 95 ℃, centrifuging, alternately washing with ethanol and deionized water for three times, putting into a vacuum drying oven, and drying for 12 h at 60 ℃ to obtain MoS2/RuO2A composite material;
(3)、MoS2/MoO2preparation of the/Ru composite material:
mixing the MoS prepared in the step (2)2/RuO2Fully grinding the composite material uniformly and flatly paving the composite material in a high-temperature-resistant quartz boat, then placing the quartz boat in a tubular electric furnace, introducing nitrogen for 30 min to exhaust air in a quartz tube of the tubular electric furnace, heating to 500 ℃ at the speed of 10 ℃/min, calcining for 6h in the nitrogen atmosphere, and taking out a black powder sample after the tubular electric furnace is naturally cooled to room temperature, wherein the black powder sample is MoS2/MoO2A/Ru composite material.
FIG. 1 shows the MoS prepared2、MoS2/RuO2Composite material and MoS2/MoO2XRD pattern of the/Ru composite. As can be seen from fig. 1: starting material is MoS2And MoS2/RuO2Composite materialXRD pattern of (1), due to RuO2Covering at MoS2(JCPDS: 00-075-1539) surface, the signal obtained by XRD test detection only shows RuO2(JCPDS: 00-040-1290); in MoS2/MoO2The XRD pattern of the/Ru composite material can be clearly found to correspond to MoO2Three peaks of (JCPDS: 00-32-0671): 26.0 ° (011), 37.0 ° (211) and 53.5 ° (312), and Ru (JCPDS: 00-001-. The solid phase reaction is interface solid phase reaction, which is difficult to completely carry out, MoS in XRD2The signal of (a) was not clear and was further analyzed by SEM and EDS.
FIGS. 2 and 3 are MoS, respectively2/MoO2SEM and EDS of/Ru composites by comparison with MoS2/MoO2Elemental analysis of the/Ru composite showed: except Mo, O and Ru, S element remains, which proves that the composite material still contains MoS2
Combining the information of fig. 1-3, it is confirmed that: the MoS is prepared by the invention2/MoO2A/Ru composite material.
Comparative example
The difference from example 1 is that: in the step (3), MoS is added2/RuO2The calcination temperatures of the composite materials were adjusted to 100 ℃, 200 ℃, 300 ℃, 400 ℃, 600 ℃, 700 ℃ and 800 ℃ respectively, and the other steps were performed in the same manner as in example 1.
FIG. 4 is a MoS2/RuO2Temperature-changing XRD pattern, namely MoS, of composite material2/RuO2XRD patterns of the products obtained after the composite materials are calcined at different calcining temperatures can be seen from the patterns: at 400 ℃ MoS2/RuO2The peak shape of the composite material XRD changes, solid phase reaction begins to occur, the reaction is more thorough along with the increase of the temperature, and the peak intensity of Ru increases.
And (3) testing the electrocatalytic performance:
preparation of a working electrode:
3 mg of MoS prepared in example 1 were weighed2/MoO2Taking the/Ru composite material as a catalyst, transferring 500 mu L absolute ethyl alcohol into a 1 m L centrifuge tube, and adding 50 percentMu L Nafion solution (5 wt%), ultrasonically dispersing the mixture to uniform ink dispersion state, and then removing 15 mu L (load-0.418 mg-cm)–2) The suspension is dropped on a Glassy Carbon Electrode (GCE) with the diameter of 5 mm to be naturally dried to be used as a working electrode for standby.
The experimental process comprises the following steps: at room temperature using an electrochemical workstation (CHI-760E) under a standard three-electrode system (saturated calomel electrode as reference electrode, graphite rod as auxiliary electrode). Respectively at 1M KOH, 0.5M H2SO41M PBS electrolyte, converting the measured overpotential relative to the saturated calomel electrode into the relative reversible hydrogen electrode potential (E RHE=E SCE+0.241+0.0591 pH). The linear polarization curves were tested at a sweep rate of 2 mV/s, and none of the resulting polarization curves were IR corrected.
FIG. 5 shows MoS2/MoO2Schematic diagram of electrocatalytic hydrogen generation performance of the/Ru composite material under different PH conditions. As can be seen from fig. 5: MoS2/MoO2When the/Ru composite material is used as an electrocatalytic hydrogen production (HER) catalyst, hydrogen production under the condition of full PH can be realized. The overpotentials under the acid and alkali conditions were 49 mV, 12 mV, and 51 mV, respectively. Among them, the hydrogen production performance under alkaline condition is particularly outstanding, which shows that the MoS2/MoO2the/Ru composite material as a catalyst has excellent electro-catalysis hydrogen production performance.

Claims (7)

1. A composite material characterized by: from MoS2、MoO2And Ru.
2. A method of preparing the composite material of claim 1, comprising the steps of:
(1)、MoS2/RuO2preparing a composite material:
mixing the nano MoS2Adding into water, performing ultrasonic dispersion under ice bath condition, and then placing the mixed solution subjected to ultrasonic dispersion into a cell crushing instrument for ultrasonic treatment for at least 30 min; adding water-soluble Ru salt and H with the concentration of 4-6 wt% into the obtained mixed solution in sequence2O2Stirring uniformly, controlling the temperature to be 80-95 ℃ for reaction for 4-6h, centrifuging, washing and drying to obtain MoS2/RuO2A composite material; wherein the molar weight of the water-soluble Ru salt is measured by the molar weight of Ru element contained in the water-soluble Ru salt, and the MoS is nano2The molar ratio of the water-soluble Ru salt to the water-soluble Ru salt is more than 1: 3, and the addition amount of water is 30-60 m L/0.2 g of nano MoS2,H2O2The addition amount of (A) is 2-4 m L/0.6 mmol water-soluble Ru salt;
(2)、MoS2/MoO2preparation of the/Ru composite material:
the MoS prepared in the step (1) is added2/ RuO2The composite material is fully and uniformly ground, and the grinding speed is N2Calcining at 400-800 ℃ for 3-6 h in the atmosphere of gas or inert gas, and naturally cooling to room temperature to obtain MoS2/MoO2A/Ru composite material.
3. A method of preparing the composite material of claim 2, wherein: in the step (1), the nano MoS2Is MoS2And (4) nano flowers.
4. A method of preparing the composite material of claim 2, wherein: in the step (1), the water-soluble Ru salt is RuCl3·3H2O。
5. A method of preparing the composite material of claim 2, wherein: in the step (1), the drying temperature is 60-80 ℃, and the drying time is 8-12 h.
6. A method of preparing the composite material of claim 2, wherein: in the step (2), during calcination, the temperature is increased at the rate of 5-10 ℃/min.
7. Use of a composite material according to claim 1, wherein: as a catalyst for electrocatalytic hydrogen evolution reaction.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112371119A (en) * 2020-11-13 2021-02-19 中南大学深圳研究院 Preparation method and application of multi-metal paired alkaline catalyst
CN113584504A (en) * 2021-08-06 2021-11-02 郑州大学 Ru/RuO2/MoO2Composite material and preparation method and application thereof
WO2022183578A1 (en) * 2021-03-05 2022-09-09 广东工业大学 Molybdenum carbide-molybdenum oxide catalyst, preparation method therefor and use thereof

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CN108682873A (en) * 2018-05-28 2018-10-19 南京晓庄学院 A kind of Ru-MoO3-x/ rGO composite material and preparation methods and application
CN109950509A (en) * 2019-04-09 2019-06-28 武汉轻工大学 A kind of MoO2/MoS2Combination electrode material and preparation method thereof

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CN108682873A (en) * 2018-05-28 2018-10-19 南京晓庄学院 A kind of Ru-MoO3-x/ rGO composite material and preparation methods and application
CN109950509A (en) * 2019-04-09 2019-06-28 武汉轻工大学 A kind of MoO2/MoS2Combination electrode material and preparation method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112371119A (en) * 2020-11-13 2021-02-19 中南大学深圳研究院 Preparation method and application of multi-metal paired alkaline catalyst
CN112371119B (en) * 2020-11-13 2023-07-07 中南大学深圳研究院 Preparation method and application of multi-metal pairing alkaline catalyst
WO2022183578A1 (en) * 2021-03-05 2022-09-09 广东工业大学 Molybdenum carbide-molybdenum oxide catalyst, preparation method therefor and use thereof
CN113584504A (en) * 2021-08-06 2021-11-02 郑州大学 Ru/RuO2/MoO2Composite material and preparation method and application thereof

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