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Nitrogen-doped graphite-loaded phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and preparation method thereof

A technology of molybdenum carbide and phosphorus doping, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of difficult to highly uniformly disperse ultrafine nanostructured structures, excessive strength, etc., and achieve uniform distribution and improved conductivity. Effect

Inactive Publication Date: 2017-05-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the synthesis process of molybdenum carbide inevitably uses high temperature (~800°C), which will inevitably cause sintering and agglomeration of molybdenum carbide particles during the synthesis process, and it is difficult to achieve a highly uniformly dispersed ultrafine nanostructure; in addition, Molybdenum carbide (β-Mo 2 C) Gibbs free energy of hydrogen adsorption (ΔG H* ) is -0.26eV, resulting in too strong Mo-H bond, inhibiting the Heyrovsky process in the hydrogen production reaction, thereby inhibiting the β-Mo 2 Electrocatalytic hydrogen production activity of C

Method used

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  • Nitrogen-doped graphite-loaded phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and preparation method thereof
  • Nitrogen-doped graphite-loaded phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and preparation method thereof
  • Nitrogen-doped graphite-loaded phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1, put 2 mmol of aniline and 0.1 mmol of phytic acid into a beaker, add 10 ml of deionized water and stir for 30 minutes, then let it stand for 10 minutes; Aqueous ammonium persulfate solution was allowed to stand at room temperature for 12 hours, and then washed with deionized water for 4 times for use. The above-mentioned washed solid product was placed in 40 g of ammonium molybdate aqueous solution with a mass concentration of 5.8%, and reacted at 50° C. for 6 hours. After the reaction, the above suspension was centrifuged and dried to obtain MoO x -Phytic acid-polyaniline (MoO x -PA-PANI) precursor.

[0025] Put the above precursor in a tube furnace, under the protection of argon, program the temperature to 850 ° C for 5 hours, and control the heating rate at 2 ° C / min, then the phosphorus-doped molybdenum carbide supported by nitrogen-doped graphite can be prepared Nanowire electrocatalytic hydrogen production catalyst. Such as figure 1 Shown: Hyperd...

Embodiment 2

[0030] Example 2, put 2 mmol of aniline and 0.2 mmol of phytic acid in a beaker, add 10 ml of deionized water and stir for 30 minutes, then let it stand for 10 minutes; Aqueous ammonium persulfate solution was allowed to stand at room temperature for 12 hours, and then washed with deionized water for 4 times for use. The above-mentioned washed solid product was placed in 40 g of ammonium molybdate aqueous solution with a mass concentration of 5.8%, and reacted at 45°C for 6 hours. After the reaction, the above suspension was centrifuged and dried to obtain MoO x -Phytic acid-polyaniline (MoO x -PA-PANI) precursor.

[0031] Put the above precursor in a tube furnace, under the protection of argon, program the temperature to 850°C for carbonization for 5 hours, and control the heating rate at 2°C / min, to prepare the phosphorus-doped molybdenum carbide nanowires supported by nitrogen-doped graphite Electrocatalytic hydrogen production catalyst.

[0032] The electrochemical tes...

Embodiment 3

[0034] Example 3, put 2 mmol of aniline and 0.15 mmol of phytic acid into a beaker, add 10 ml of deionized water and stir for 30 minutes, then let it stand for 10 minutes; Aqueous ammonium persulfate solution was allowed to stand at room temperature for 12 hours, and then washed with deionized water for 4 times for use. The above-mentioned washed solid product was placed in 40 g of ammonium molybdate aqueous solution with a mass concentration of 5.8%, and reacted at 50° C. for 6 hours. After the reaction, the above suspension was centrifuged and dried to obtain MoO x -Phytic acid-polyaniline (MoO x -PA-PANI) precursor.

[0035] Put the above precursor in a tube furnace, under the protection of argon, program the temperature to 850°C for carbonization for 5 hours, and control the heating rate at 2°C / min, to prepare the phosphorus-doped molybdenum carbide nanowires supported by nitrogen-doped graphite The electrochemical test of the nitrogen-doped graphite supported phosphoru...

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Abstract

The invention belongs to the technical field of electrocatalytic hydrogen production, and in particular relates to a nitrogen-doped graphite-loaded phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and a preparation method thereof. The catalyst has a rough-surface nanowire structure with a diameter of 100-200nm on the whole, the particle size distribution of an active centre beta-Mo2C is 2-10nm, and beta-Mo2C particles are closely embedded on the surface of nitrogen-doped graphite, phosphorus is evenly doped into a beta-Mo2C structure by means of a phosphorus-molybdenum bond. The nitrogen-doped graphite is generated in place in a high-temperature carbonation process of polyaniline in MoOx-phytic acid-polyaniline hybrid precursor. The catalyst has very high electrocatalytic hydrogen production activity and stability under the acidic condition; the preparation method of the catalyst is simple in operation, high in adjustability, low in raw material price and low in production process risk, thus being suitable for large scale production and industrial hydrogen production by using electrolysis of water.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen production, and in particular relates to a nitrogen-doped graphite-supported phosphorus-doped molybdenum carbide nanowire electrocatalytic hydrogen production catalyst and a preparation method thereof. Background technique [0002] Hydrogen is an important industrial raw material, widely used in petrochemical industry, electronics industry, metallurgical industry, fine organic synthesis, aerospace and other fields. In addition, hydrogen has the advantages of high energy density, excellent combustion performance, clean and pollution-free (the combustion product is only water), making it the best substitute for traditional fossil energy. At present, the industrial hydrogen production process relies heavily on fossil energy. The main methods are petrochemical catalytic cracking and natural gas steam reforming to produce hydrogen. From the perspective of comprehensive utilization of...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04
CPCC25B1/04C25B11/04Y02E60/36
Inventor 唐颐石张平刘博伦高伯旭王洋霞张亚红
Owner FUDAN UNIV
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