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Nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and preparation method thereof

A transition metal, phosphide technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as environmental pollution, dangerous reaction process, etc., achieve environmental friendliness, simple preparation method, overcome Uneven coverage

Inactive Publication Date: 2017-11-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional methods for preparing transition metal phosphides not only require harsh conditions such as high temperature and high pressure, but also the phosphorus sources used are mostly red phosphorus, red phosphorus, hypophosphite and highly toxic pH 3 , causing the reaction process to be extremely dangerous and causing environmental pollution, (Sun et al. ACS Appl. Mater. Interfaces 2014, 6, 21874)

Method used

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  • Nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and preparation method thereof
  • Nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and preparation method thereof
  • Nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0040] 1. Add 40 mL of deionized water to a beaker, add 0.02 g of ruthenium trichloride hydrate, 1.0 g of phytic acid and stir for a period of time, then add 2.0 g of dicyandiamide and stir to obtain a uniform mixture.

[0041] 2. Dry the mixture in step 1 in a drying oven to obtain a solid powder.

[0042] 3. Place the solid powder in step 2 in the porcelain boat, and oscillate to spread it evenly in the porcelain boat. Put the magnetic boat with the sample into the center of the high-temperature furnace with quartz tube, seal it, pass in argon gas for a period of time to remove the air in the quartz tube, place it at 800°C for 8 hours, and then continue to pass in inert gas until the temperature of the high-temperature furnace drops. After reaching room temperature.

[0043] 4. Take out the product in step 3.

[0044] figure 1 It is the XRD and TEM spectrum of the composite material. It can be seen from the XRD pattern that compared with the standard card, the obtained p...

example 2

[0047] 1. Add 100 mL of deionized water to a beaker, add 0.05 g of iridium trichloride hydrate, 2.0 g of ammonium phosphate and stir for a while, then add 2.0 g of melamine and stir to obtain a homogeneous mixture.

[0048] 2. Dry the mixture in step 1 in a drying oven to obtain a solid powder.

[0049] 3. Place the solid powder in step 2 in a high-temperature furnace at 900° C. for annealing in an argon atmosphere for 6 hours, and then cool naturally to room temperature.

[0050] 4. Take out the product in step 3.

[0051] Figure 5 is the XRD spectrum of the composite material.

[0052] It can be seen from the XRD pattern that compared with the standard card, the obtained product is iridium diphosphide.

[0053] 5. Make the iridium diphosphide coated with nitrogen-phosphorus double-doped carbon obtained in step 4 into 10mg mL -1 After ultrasonic treatment for 30 minutes, take 10 microliters and drop it on a conductive base such as a glassy carbon electrode, carbon cloth,...

example 3

[0055] 1. Add 50 mL of deionized water to a beaker, add 0.05 g of rhodium trichloride hydrate, 1.0 g of potassium dihydrogen phosphate and stir for a period of time, then add 4.0 g of cyanamide and stir to obtain a uniform mixture.

[0056] 2. Dry the mixture in step 1 in a drying oven to obtain a solid powder.

[0057] 3. Place the solid powder in step 2 in a high-temperature furnace at 700° C. for 4 hours in an argon atmosphere, and then cool naturally to room temperature to obtain a nitrogen-phosphorus double-doped carbon-coated rhodium diphosphide product.

[0058] 4. Take out the product in step 3. The rhodium diphosphide coated with nitrogen-phosphorous double-doped carbon was made into 10mg mL -1 After ultrasonic treatment for 30 minutes, take 10 microliters and drop it on a conductive base such as a glassy carbon electrode, carbon cloth, conductive glass, titanium sheet, etc., and use it as a working electrode after drying. Saturated calomel is the reference electrod...

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Abstract

The invention relates to a nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and a preparation method thereof. The nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide is characterized in that the structural formula is MP2@NPC, a transition metal diphosphide MP2 is used as a core, nitrogen-phosphorus double-doped carbon NPC is used as a shell so that a core-shell structure is formed, the diphosphide has a nano-particle structure, the particle size is less than 50nm and good crystallinity is obtained. The composite catalyst has the electrocatalytic hydrogen evolution activity similar to that of the commercial platinum carbon and catalyst stability better than that of the commercial catalyst. The catalyst has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and more precisely, relates to a nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and its use as an efficient and stable catalyst for electrolyzing water to produce hydrogen. Background technique [0002] The use of fossil fuels not only accelerates global climate and environmental changes, but is itself threatened with depletion. Therefore, there is an urgent need to develop clean and sustainable new energy sources. Hydrogen energy is an abundant and renewable clean energy, which is considered to be an ideal choice to replace fossil fuels in the future. Electrolysis of water provides an effective method of hydrogen production, but one of the current problems in electrolysis of water is the high power consumption, which makes the production cost high, and the high hydrogen evolution overpotential is one of the reasons, although ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02B01J37/08C25B1/04C25B11/06
CPCC25B1/04B01J27/24B01J37/08C25B11/091B01J35/00B01J35/30Y02E60/36
Inventor 木士春蒲宗华寇宗魁王敏刘少君钱盛泰
Owner WUHAN UNIV OF TECH
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