Lily-shaped tungsten nitride/tungsten oxycarbide composite material and its preparation method and application

A technology of tungsten oxycarbide and composite materials, which is applied in the field of electrochemistry, can solve the problems that it is difficult to obtain high-efficiency, durable, and low-cost tungsten nitride composite materials, it is difficult to improve the catalytic efficiency of electrolytic water, and the synthesis temperature of tungsten nitride is high, so as to achieve improvement. Effects of cycle stability, uniform crystal structure and morphology, high purity and crystallinity

Active Publication Date: 2022-02-11
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] Therefore, it is very necessary to use tungsten nitride as an alternative carrier material for Pt, and it is of great value for electrolytic water splitting to produce hydrogen. However, in the process of preparing tungsten nitride, the synthesis temperature of tungsten nitride is high and the surface morphology is not good. It is difficult to obtain high-efficiency, durable, and low-cost tungsten nitride composite materials, and it is difficult to improve the catalytic efficiency of electrolyzed water.

Method used

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  • Lily-shaped tungsten nitride/tungsten oxycarbide composite material and its preparation method and application
  • Lily-shaped tungsten nitride/tungsten oxycarbide composite material and its preparation method and application
  • Lily-shaped tungsten nitride/tungsten oxycarbide composite material and its preparation method and application

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preparation example Construction

[0027] A lily-shaped WN / W of the present invention 2 (C, O) the preparation method of composite material, comprises the steps:

[0028] Step 1, first mix pyrrole and absolute ethanol evenly, wherein the volume ratio of pyrrole and absolute ethanol is 1: (40-60), to obtain solution A;

[0029] Step 2, add a certain amount of tungsten source to a certain amount of ultrapure water to obtain solution B, the tungsten source is tungsten phosphate, the mass is 1.2-2g, and the volume of ultrapure water is 80-100mL;

[0030] Step 3: After mixing solution A and solution B at a volume ratio of 1:4, stir for 12-18 hours, induce pyrrole polymerization by tungsten phosphate to form polypyrrole PPy, and dry the precipitate after centrifugation at a drying temperature of 60-80 ℃, the collected product was labeled as PPy-PW 12 ; Since the molecular formula of tungsten phosphate is H 3 o 40 PW 12 .xH 2 O, here abbreviated as PW 12 ;

[0031] Step 4, put the collected samples into a porc...

Embodiment 1

[0035] (1) First mix pyrrole and absolute ethanol evenly, wherein the volume ratio of pyrrole and absolute ethanol is 1:40 to obtain solution A;

[0036] (2) Add 1.2g of tungsten phosphate into 80mL of ultrapure water to obtain solution B;

[0037] (3) After mixing 20mL of solution A and solution B, stir for 12h, after centrifugation, dry in a vacuum oven at 60°C, collect the obtained product and mark it as PPy-PW 12 ;

[0038] (4) Put the collected samples into a porcelain boat and place them in a high-temperature tube furnace, vacuumize, fill with argon, and repeat three times to remove the air in the tube. Min heat up to 800°C for nitridation for 2 hours, and take out the porcelain boat when it cools down to room temperature;

[0039] (5) Pour the sample in the porcelain boat into a mortar and grind it into a non-grainy powder to obtain lily-like WN / W 2 (C,O).

Embodiment 2

[0041](1) First mix pyrrole and absolute ethanol evenly, wherein the volume ratio of pyrrole and absolute ethanol is 1:50 to obtain solution A;

[0042] (2) Add 1.4g of tungsten phosphate to 90mL of ultrapure water to obtain solution B;

[0043] (3) After mixing 22.5mL of solution A and solution B, stir for 14h, after centrifugation, dry in a vacuum oven at 70°C, collect the obtained product and mark it as PPy-PW 12 ;

[0044] (4) Put the collected samples into a porcelain boat and place them in a high-temperature tube furnace, vacuumize, fill with argon, and repeat three times to remove the air in the tube. Min heat up to 900°C for nitriding for 3 hours, and take out the porcelain boat when it cools down to room temperature;

[0045] (5) Pour the sample in the porcelain boat into a mortar and grind it into a non-grainy powder to obtain lily-like WN / W 2 (C,O).

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Abstract

The invention provides a lily flower-like tungsten nitride / tungsten oxycarbide composite material and its preparation method and application. The method includes the following steps: uniformly mixing pyrrole, absolute ethanol, tungsten source and ultrapure water and then centrifuging to obtain a precipitate ; Nitriding the precipitate at 800-1000°C under a protective gas after drying to obtain a lily-like tungsten nitride / tungsten oxycarbide composite material. WN / W 2 (C,O)composites have uniform chemical composition, high purity, and high crystallinity, especially the lily-like self-assembly, which increases the conductivity and specific surface area of ​​the material, which in turn can provide more active sites to participate in the electrical process. The chemical reaction finally reduces the reaction barrier of the electrochemical reaction process, has excellent hydrogen evolution performance of electrolyzed water, improves hydrogen production efficiency, effectively improves the performance of electrolyzed water, and has broad application prospects.

Description

Technical field: [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lily-like tungsten nitride / tungsten oxycarbide composite material and a preparation method and application thereof. Background technique: [0002] At present, it is urgent to find a new generation of sustainable development, green environmental protection, cost-effective new energy. Water splitting is one of the ways to generate clean energy, and the decomposition products are only O 2 and H 2 , no emission of polluting gases, and zero pollution to the environment, so water splitting to produce hydrogen has attracted attention. Although there are many technologies for producing hydrogen, hydrogen production by electrolysis of water is considered to be the most promising one because it is least affected by the external environment. Therefore, electrocatalytic water splitting to produce hydrogen as a clean and sustainable energy conversion and storage tec...

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 黄剑锋李帅楠冯亮亮曹丽云何丹阳冯李张晓陈俊生
Owner SHAANXI UNIV OF SCI & TECH
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