Nitrogen-doped MXene Pd-loaded catalyst as well as preparation method and application thereof

A nitrogen doping, catalyst technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor stability

Active Publication Date: 2021-06-15
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easily oxidized in an oxygen-rich environment such as air and water, causing it to become an oxide and has poor stability.

Method used

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  • Nitrogen-doped MXene Pd-loaded catalyst as well as preparation method and application thereof
  • Nitrogen-doped MXene Pd-loaded catalyst as well as preparation method and application thereof
  • Nitrogen-doped MXene Pd-loaded catalyst as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a kind of preparation method of nitrogen-doped MXene loaded Pd catalyst, comprising the following steps:

[0031] (1) The MXene material is mixed with the HF solution for etching to obtain the MXene carrier; the etching time is (24-32) h;

[0032] (2) the MXene carrier that described step (1) is obtained is mixed with nitrogen source, carries out hydrothermal reaction, obtains nitrogen-doped MXene carrier;

[0033] (3) the nitrogen-doped MXene carrier obtained in the step (2) is mixed with water and PdCl 2 The solutions are mixed, reacted at 50-60° C. for 4-6 hours, and then a reducing agent is added to carry out an oxidation-reduction reaction to obtain a nitrogen-doped MXene supported Pd catalyst.

[0034] In the invention, the MXene material is mixed with the HF solution for etching to obtain the MXene carrier.

[0035] In the present invention, the MXene material preferably includes Ti 3 AlC 2 、Ti 2 C, V 2 C and Mo 3 C 2 One or more of, ...

Embodiment 1

[0103] Ammonia doped etching of Ti for 28 hours 3 C 2 Carrier Pd-based catalyst

[0104] (1) Take a 50mL plastic beaker (put in a magnet), add 30mL of 40% HF solution into the beaker, and then weigh 2.5g Ti 3 AlC 2 (commercially available). Added to the HF solution in batches (completed in about 5 minutes), covered with plastic wrap, and stirred and reacted at room temperature for 28 hours. Centrifuge and wash with deionized water until the pH is about 6 (rotating speed is 10000r / min, 10min). The obtained product was transferred to a 50mL beaker, 30mL of absolute ethanol was added, and the ultrasonic time was 30min, which was completed three times. After suction filtration, dry at a constant temperature of 80°C to obtain an MXene carrier with a reaction time of 28 hours, hereinafter referred to as Ti 3 C 2 -28h.

[0105] (2) Using ammonia water as the nitrogen source, add 0.2g of Ti to a 50mL dry beaker 3 C 2 -28h sample, then add 30mL ammonia water with a concentrat...

Embodiment 2

[0112] (1) Same as the preparation method of Example 1 step (1), obtain the MXene carrier, referred to as Ti 3 C 2 -28h.

[0113] (2) With urea as the nitrogen source, add 0.2g of Ti to a 50mL dry beaker 3 C 2 -28h sample, then calculate the urea with the same N molar content as ammoniacal liquor in Example 1, by calculating the total mass of urea required is 9.75g, add urea 5.85g and 30ml water, wherein, the quality of MXene carrier and the nitrogen in urea The substance ratio of the element is 0.2g:0.67mol; ultrasonic crushing is used to reduce the particle size, and the ultrasonic wave is divided into 3 times for a total of 15 minutes. The mixture is transferred to the reactor, and 3.9g and 20mL of urea are added. water. The reaction conditions were heating at 180°C for 12h. After cooling, suction filter and wash with deionized water until the pH value of the supernatant reaches 7. Dry in a blast oven at 80°C for 12 hours to obtain N-Ti 3 C 2 -28h vector.

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Abstract

The invention belongs to the technical field of catalytic materials, and provides a preparation method of a nitrogen-doped MXene Pd-loaded catalyst. According to the preparation method,an MXene material is etched by using an HF solution, and the etching time is controlled, so that an MXene carrier can be fully stripped into a layered material, and collapse of the layered material caused by excessive stripping can be prevented, the MXene carrier has a relatively large electrochemical activity surface area, so that the MXene carrier has excellent activity; nitrogen doping is carried out on the MXene carrier by utilizing a nitrogen source through a hydrothermal reaction, and on one hand, the catalytic activity of the material can be improved through the nitrogen doping, on the other hand, the stability of the MXene carrier can be improved; and pd is uniformly formed on the nitrogen-doped MXene carrier by controlling reaction temperature and time, so that the catalytic activity of the nitrogen-doped MXene Pd-loaded catalyst can be remarkably improved. The catalyst provided by the invention has excellent electrocatalytic activity and stability.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a nitrogen-doped MXene-supported Pd catalyst and a preparation method and application thereof. Background technique [0002] Direct alcohol fuel cells have attracted extensive attention from scholars all over the world due to their advantages such as high energy density, abundant raw material sources, and easy transportation and storage. Among them, direct ethanol fuel cells (DEFCs) have the advantages of non-toxicity and low leakage rate through the electrolytic membrane. In addition, ethanol is a renewable resource that can be fermented with biological raw materials and is environmentally friendly. Therefore, ethanol has become the most promising alternative to methanol fuel. However, the low efficiency and extremely complex mechanism of ethanol oxidation are the main challenges hindering the commercialization of DEFCs. For example, the 12-electron electrocatalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/926H01M4/8817H01M4/8825Y02E60/50
Inventor 金燕仙陈章新余彬彬文秀丽骆明辉刑舒羽
Owner TAIZHOU UNIV
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