Molybdenum-based electrocatalyst, preparation method of molybdenum-based electrocatalyst, difunctional electrolytic tank and application of difunctional electrolytic tank

Abstract

The invention discloses a molybdenum-based electrocatalyst and a preparation method thereof as well as a bifunctional electrolytic tank and application thereof, and the preparation method of the molybdenum-based electrocatalyst comprises the following steps: adding ammonium molybdate and polyethylene glycol into water, uniformly stirring, then continuously adding concentrated nitric acid, and stirring to obtain a mixed solution; adding the mixed solution into a reaction kettle for hydrothermal reaction, cooling after the reaction is finished, and centrifuging, washing and drying a product to obtain the molybdenum-based electrocatalyst alpha-MoO3. Raw materials adopted for preparing the molybdenum-based electrocatalyst are easy to obtain, the cost is low, the preparation process is easy to operate, the difunctional electrolytic tank takes the prepared molybdenum-based electrocatalyst as a working electrode and takes a mixed solution of potassium hydroxide and urea as an electrolyte to be applied to hydrogen production and urea wastewater degradation, the hydrogen production efficiency is improved, and the production cost is reduced. Meanwhile, urea pollutants are oxidized and degraded, and the method is green and environment-friendly.

Description

technical field

[0001] The invention belongs to the technical field of hydrogen production, and in particular relates to a molybdenum-based electrocatalyst and a preparation method thereof, a dual-function electrolytic cell and an application thereof. Background technique

[0002] In recent years, the global energy crisis and environmental pollution have seriously endangered the survival of human beings. Therefore, it is very necessary to develop clean and renewable energy. Hydrogen has been widely concerned as a clean energy source. Among many hydrogen production methods, electrocatalytic water splitting is considered to be a widely used hydrogen production method, but this method is also limited by the four-electron half-reaction of water oxidation. Slow kinetics, high overpotentials, and high applied voltages are challenging. The study shows that this limitation can be overcome by replacing the slow water oxidation half-reaction with a more readily oxidizable molecule. ...

Examples

Embodiment 1

[0027] At room temperature, add 1.23g of ammonium molybdate and 0.4g of polyethylene glycol into a beaker filled with 30mL of water, and stir for 30min; then add 5ml of nitric acid with a concentration of 65%-68%, stir for 30min, and transfer to In a polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 160°C for 24 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, and the product is a molybdenum-based electrocatalyst α -MoO 3 .

[0028] figure 1 Prepared for this example α -MoO 3 The X-ray diffraction (XRD) pattern, as can be seen from the figure, the product prepared in this embodiment is the same as α -MoO 3 The standard card (JCPDS: 89-7112) is consistent, indicating that the prepared product is phase-pure α -MoO 3 electrocatalyst.

[0029] figure 2 Prepared for this example α -MoO 3 Scanning electron microscope (SEM) figure, it can be seen from the figure th...

Embodiment 2

[0031] At room temperature, add 1.2g of ammonium molybdate and 0.4g of polyethylene glycol into a beaker filled with 30mL of water, and stir for 30min; then add 5ml of nitric acid with a concentration of 65%-68%, stir for 30min, and transfer to In a polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 160°C for 24 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, and the product is a molybdenum-based electrocatalyst α -MoO 3 , its XRD figure and SEM figure are identical with embodiment 1.

Embodiment 3

[0033] At room temperature, add 1.20g of ammonium molybdate and 0.387g of polyethylene glycol into a beaker containing 28mL of water, and stir for 20min; then add 4.9ml of nitric acid with a concentration of 65%-68%, stir for 20min, and transfer Into the polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 170 ° C for 22 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, the product is molybdenum-based electrocatalyst α -MoO 3 , its XRD figure and SEM figure are identical with embodiment 1.

technical field

[0001] The invention belongs to the technical field of hydrogen production, and in particular relates to a molybdenum-based electrocatalyst and a preparation method thereof, a dual-function electrolytic cell and an application thereof. Background technique

[0002] In recent years, the global energy crisis and environmental pollution have seriously endangered the survival of human beings. Therefore, it is very necessary to develop clean and renewable energy. Hydrogen has been widely concerned as a clean energy source. Among many hydrogen production methods, electrocatalytic water splitting is considered to be a widely used hydrogen production method, but this method is also limited by the four-electron half-reaction of water oxidation. Slow kinetics, high overpotentials, and high applied voltages are challenging. The study shows that this limitation can be overcome by replacing the slow water oxidation half-reaction with a more readily oxidizable molecule. ...

Examples

Embodiment 1

[0027] At room temperature, add 1.23g of ammonium molybdate and 0.4g of polyethylene glycol into a beaker filled with 30mL of water, and stir for 30min; then add 5ml of nitric acid with a concentration of 65%-68%, stir for 30min, and transfer to In a polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 160°C for 24 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, and the product is a molybdenum-based electrocatalyst α -MoO 3 .

[0028] figure 1 Prepared for this example α -MoO 3 The X-ray diffraction (XRD) pattern, as can be seen from the figure, the product prepared in this embodiment is the same as α -MoO 3 The standard card (JCPDS: 89-7112) is consistent, indicating that the prepared product is phase-pure α -MoO 3 electrocatalyst.

[0029] figure 2 Prepared for this example α -MoO 3 Scanning electron microscope (SEM) figure, it can be seen from the figure th...

Embodiment 2

[0031] At room temperature, add 1.2g of ammonium molybdate and 0.4g of polyethylene glycol into a beaker filled with 30mL of water, and stir for 30min; then add 5ml of nitric acid with a concentration of 65%-68%, stir for 30min, and transfer to In a polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 160°C for 24 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, and the product is a molybdenum-based electrocatalyst α -MoO 3 , its XRD figure and SEM figure are identical with embodiment 1.

Embodiment 3

[0033] At room temperature, add 1.20g of ammonium molybdate and 0.387g of polyethylene glycol into a beaker containing 28mL of water, and stir for 20min; then add 4.9ml of nitric acid with a concentration of 65%-68%, stir for 20min, and transfer Into the polytetrafluoroethylene lining, hydrothermal reaction at a constant temperature of 170 ° C for 22 hours; after the reaction is complete, naturally cool to room temperature, wash with ethanol and water, centrifuge, and dry, the product is molybdenum-based electrocatalyst α -MoO 3 , its XRD figure and SEM figure are identical with embodiment 1.

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