Preparation method and application of high-efficiency seawater full electrolysis catalyst for hydrogen phosphide production

A phosphide and catalyst technology, which is applied in the field of preparation of hydrogen phosphide catalysts for high-efficiency full electrolysis of seawater, can solve problems such as corrosion of production equipment, hindrance of full contact between electrodes and electrolyte, and chlorine gas as a side reaction of chlorine analysis, so as to reduce corrosion, The effect of excellent oxygen evolution selectivity

Active Publication Date: 2022-05-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex composition of seawater, direct electrolysis of seawater for hydrogen production mainly faces the following problems: (1) At the anode, when the current density is high, side reactions of chlorine analysis are prone to occur and toxic gas chlorine gas is produced, threatening life safety and corroding production equipment , bringing production safety hazards
(2) When the pH of calcium and magnesium ions in seawater is higher than 9.5, insoluble precipitates will be produced on the cathode and anode, adsorbed on the surface of the electrode and hinder the full contact between the electrode and the electrolyte, thereby reducing the reactivity and service life of the catalyst
(3) Since the hydrogen evolution reaction is easier to proceed under acidic conditions, and the oxygen evolution reaction is easier to proceed under alkaline conditions, the current research on catalysts for hydrogen evolution by seawater electrolysis can only achieve single-function catalysis for hydrogen evolution or oxygen evolution
Therefore, in practical applications, different electrolysis environments and devices must be provided for the cathode and anode, which greatly increases the cost of seawater electrolysis for hydrogen production.

Method used

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  • Preparation method and application of high-efficiency seawater full electrolysis catalyst for hydrogen phosphide production
  • Preparation method and application of high-efficiency seawater full electrolysis catalyst for hydrogen phosphide production
  • Preparation method and application of high-efficiency seawater full electrolysis catalyst for hydrogen phosphide production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1. Add ferric nitrate (81mg, 0.2mmol), nickel nitrate (175mg, 0.6mmol), ammonium molybdate (124mg, 0.1mmol), urea (240mg, 4mmol) and ammonium fluoride (59mg, 1.6mmol) in sequence In a stirrer filled with 40 mL of deionized water, stir evenly for 10 min, and set the speed of the stirrer at 500 r / min. After the mixture is fully dissolved, transfer the mixed solution to a 50 mL hydrothermal kettle.

[0017] Step 2. Take carbon fiber paper with a length of 3 cm and a width of 2 cm and place it in the hydrothermal kettle of step 1. After ultrasonic treatment for 7 minutes, conduct a hydrothermal reaction at a temperature of 120 ° C. The reaction time is controlled at 12 hours. After the reaction is completed, The carbon fiber paper was taken out, rinsed repeatedly with deionized water 4 times, and dried in a vacuum drying oven for 12 h at a temperature of 60 °C to obtain a NiFeMo@CFP sample. Its scanning electron microscope image, such as figure 1 As shown, the NiFeMo ...

Embodiment 2

[0020] Step 1. Add ferric nitrate (81mg, 0.2mmol), nickel nitrate (350mg, 1.2mmol), ammonium molybdate (124mg, 0.1mmol), urea (240mg, 4mmol) and ammonium fluoride (59mg, 1.6mmol) in sequence In a stirrer filled with 40 mL of deionized water, stir evenly for 10 min, and set the speed of the stirrer at 300 r / min. After the mixture is fully dissolved, transfer the mixed solution to a 50 mL hydrothermal kettle.

[0021] Step 2. Take carbon fiber paper with a length of 3 cm and a width of 2 cm and place it in the hydrothermal kettle of step 1. After ultrasonic treatment for 10 minutes, conduct a hydrothermal reaction at a temperature of 160 ° C. The reaction time is controlled at 18 hours. After the reaction is completed, The carbon fiber paper was taken out, rinsed repeatedly with deionized water 4 times, and dried in a vacuum drying oven for 12 h at a temperature of 60 °C to obtain a NiFeMo@CFP sample.

[0022] Step 3. Weigh 120 mg of sodium hypophosphite and place it upstream of...

Embodiment 3

[0024] Step 1. Add ferric nitrate (81mg, 0.2mmol), nickel nitrate (175mg, 0.6mmol), ammonium molybdate (500mg, 0.4mmol), urea (240mg, 4mmol) and ammonium fluoride (59mg, 1.6mmol) in sequence In a stirrer filled with 40mL of deionized water, stir evenly for 8min, and set the speed of the stirrer at 700r / min. After the mixture is fully dissolved, transfer the mixed solution to a 50mL hydrothermal kettle.

[0025] Step 2. Take carbon fiber paper with a length of 4 cm and a width of 2 cm and place it in the hydrothermal kettle of step 1. After ultrasonic treatment for 8 minutes, conduct a hydrothermal reaction at a temperature of 120°C. The reaction time is controlled at 12 hours. After the reaction is completed, The carbon fiber paper was taken out, rinsed repeatedly with deionized water four times, and dried in a vacuum drying oven for 12 hours at a temperature of 80 °C to obtain a NiFeMo@CFP sample. XRD spectrum, such as figure 2 As shown, it can be seen that Mo 6+ After the...

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Abstract

The invention belongs to the technical field of carbon-based material preparation, and relates to a preparation method and application of a high-efficiency seawater full-electrolysis hydrogen phosphide catalyst. Wherein the preparation method comprises the following steps: (1) adding ferric nitrate, nickel nitrate, ammonium molybdate, urea and ammonium fluoride into a stirrer filled with deionized water, stirring evenly and transferring to a hydrothermal kettle; (2) Put carbon fiber paper, carbon cloth or foamed nickel in a hydrothermal kettle, perform hydrothermal reaction after ultrasonic treatment, take out carbon fiber paper, carbon cloth or foamed nickel, rinse and dry repeatedly with deionized water, and obtain supported NiFeMo (3) The sodium hypophosphite and the loaded NiFeMo sample were placed upstream and downstream of the quartz boat respectively, and then placed in a tube furnace for low-temperature phosphating to obtain a NiFeMoP loaded phosphide catalyst. The method of the invention has simple process and safe operation, and can provide a stable dual-function catalyst for hydrogen production by seawater electrolysis.

Description

technical field [0001] The invention relates to a preparation method and application of a high-efficiency seawater full-electrolysis hydrogen phosphide catalyst and belongs to the technical field of carbon-based material preparation. Background technique [0002] Hydrogen energy is considered to be the most ideal energy carrier due to its advantages of high combustion calorific value, clean and pollution-free. At present, the main methods of hydrogen production include fossil fuel conversion hydrogen production, biological hydrogen production, photolysis of water hydrogen production, electrolysis of water hydrogen production and thermal decomposition hydrogen production. Among them, hydrogen production by electrolysis of water has gradually attracted attention because of its high purity and environmental protection, and has become one of the ideal hydrogen production methods. Seawater reserves account for about 97% of the world's total water resources, and can be considered...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 于畅王辉邱介山黄红菱谭新义
Owner DALIAN UNIV OF TECH
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