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A method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a molybdenum phosphide precursor

A phosphide molybdate, hydrogen evolution electrode technology, applied in electrodes, electrolysis components, electrolysis process and other directions, can solve the problems of low catalytic activity and poor stability of molybdenum-based hydrogen evolution electrodes, and achieve excellent hydrogen evolution activity and stability, cost Effects of low, high activity and stability

Inactive Publication Date: 2017-07-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a molybdophosphide precursor to prepare high-performance Molybdenum-based hydrogen evolution electrode method

Method used

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  • A method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a molybdenum phosphide precursor
  • A method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a molybdenum phosphide precursor
  • A method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a molybdenum phosphide precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Pretreatment of nickel foam substrate

[0034] Put the nickel foam substrate into the acetone solution and ultrasonically vibrate for 15 minutes for chemical degreasing, then soak it in the aqueous hydrochloric acid solution with a molar concentration of 3 mol / L for 30 minutes to remove the oxides on the surface of the substrate, and finally clean it with deionized water, and then Store in absolute ethanol solution until use.

[0035] (2) Preparation of molybdate precursor

[0036] Take deionized water as solvent, prepare the mixed solution of nickel nitrate, ammonium molybdate, wherein the molar concentration of nickel ion is 0.05 mole / liter, and the molar concentration of molybdenum is 0.05 mole / liter; The substrate was put into a reaction kettle containing a mixed solution of nickel nitrate and ammonium molybdate, and reacted at a temperature of 150°C for 6 hours; after the reaction was completed, it was rinsed with deionized water and dried to obtain a nickel m...

Embodiment 2

[0046] Step (1) is the same as step (1) in Example 1.

[0047] (2) Preparation of molybdate precursor

[0048] Take deionized water as solvent, prepare the mixed solution of cobalt nitrate, ammonium molybdate, wherein the molar concentration of cobalt ion is 0.03 mole / liter, and the molar concentration of molybdenum is 0.03 mole / liter; Put the substrate into a reaction kettle containing a mixed solution of cobalt nitrate and ammonium molybdate, and react at a temperature of 150°C for 12 hours; after the reaction is completed, rinse it with deionized water and dry it to obtain a cobalt molybdate precursor .

[0049] (3) Preparation of molybdenum-based hydrogen evolution electrode

[0050] Place the precursor prepared in step (2) together with sodium hypophosphite in a tube furnace, where the position of sodium hypophosphite is close to the inlet end of the tube furnace, where the molar ratio of Mo:P is 1:10; In an inert atmosphere, the temperature was raised to 400°C and mai...

Embodiment 3

[0052] Step (1) is the same as step (1) in Example 1.

[0053] (2) Preparation of molybdate precursor

[0054] Take deionized water as solvent, prepare the mixed solution of ferrous sulfate, potassium molybdate, wherein the molar concentration of ferrous ion is 0.005 mole / liter, and the molar concentration of molybdenum is 0.01 mole / liter; Step (1) pretreated The foamed nickel substrate was placed in a reaction kettle containing a mixed solution of ferrous sulfate and potassium molybdate, and reacted at a temperature of 60°C for 72 hours; after the reaction was completed, it was rinsed with deionized water and dried; then the hydrothermal reaction The finished nickel foam substrate was placed in a hydrogen atmosphere at a temperature of 300° C. for 5 hours, cooled to room temperature, and taken out to obtain a ferrous molybdate precursor.

[0055] (3) Preparation of molybdenum-based hydrogen evolution electrode

[0056] The precursor prepared in step (2) is placed in a tube ...

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Abstract

The invention provides a method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a phosphide molybdate precursor, which belongs to the field of electrocatalytic hydrogen evolution in water electrolysis and chlor-alkali industry. In the present invention, the nickel foam is firstly pretreated, and then the molybdate precursor is grown in situ on the surface of the pretreated nickel foam substrate by a hydrothermal synthesis method, and finally the prepared precursor and the phosphorus source are put into a tube furnace together. The molybdate precursor was phosphated to prepare a high-performance molybdenum-based hydrogen evolution electrode. The method of the invention is novel, the required process is simple, the production cost is low, the requirements for equipment are low, and it is suitable for industrial production, and the electrode has a large specific surface area, is firmly combined with the substrate, has excellent hydrogen evolution activity and stability, and can be widely used in water Electrolysis, chlor-alkali industry hydrogen analysis field.

Description

technical field [0001] The invention belongs to the field of electrocatalytic hydrogen evolution in water electrolysis and chlor-alkali industry, and in particular relates to a method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a molybdenum phosphide precursor. Background technique [0002] Hydrogen energy is a high-performance, clean secondary energy with many advantages such as high energy density, high thermal conversion performance rate, low transportation cost, and zero pollution to the environment. workers' attention. Hydrogen evolution by electrolysis of water is one of the most mature and cheap methods for hydrogen production. The electrolytic water hydrogen evolution electrode materials used in industry still have disadvantages such as high overpotential, excessive energy consumption and easy corrosion, which have become important factors restricting the development of water electrolysis and chlor-alkali industry. Although h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/10C25B11/06
Inventor 魏子栋廖满生熊昆靳文婷丁炜陈四国
Owner CHONGQING UNIV
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