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A kind of porous concave cube conp@cosa-n-c catalyst and its preparation method and application

A technology of cube and catalyst, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of Fe-N-C catalyst performance decline, catalyst durability decline, etc., and achieve the effect of improving density, strong durability, and large external surface area.

Active Publication Date: 2022-01-11
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while Fe and H 2 o 2 Hydroxyl and hydroperoxyl radicals produced by the Fenton reaction between
Therefore, it is imperative to develop iron-free or iron-functionalized materials to address the degradation of catalyst durability caused by the Fenton reaction.

Method used

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  • A kind of porous concave cube conp@cosa-n-c catalyst and its preparation method and application
  • A kind of porous concave cube conp@cosa-n-c catalyst and its preparation method and application
  • A kind of porous concave cube conp@cosa-n-c catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Synthesis of Example 1 ZnCo-ZIF nanocubes:

[0042] (1) Weigh 2mmol Zn(NO 3 ) 2 .6H 2 O, 0.15mmol Co(NO 3 ) 2 .6H 2 0 and 10mg CTAB (cetyltrimethylammonium bromide), the above-mentioned weighed sample was dissolved in 20mL ultrapure water, vigorously stirred to form a uniform transparent pink A solution.

[0043] (2) Weigh 110mmol of 2-methylimidazole and dissolve it in 140mL of ultrapure water, and stir vigorously to form a uniform transparent B solution.

[0044] (3) Under the condition of 500 rpm, quickly pour the step (1) A solution into the step (2) B solution to form a purple solution, and react at room temperature for 12 hours.

[0045] (4) The material obtained in step (3) is centrifugally washed with a rotating speed of 8000-10000rpm, and the solvent is ultrapure water,

[0046] After extensive washing several times, it was then dried overnight at 60 °C.

Embodiment 2

[0047] Example 2 Porous concave cube Co SA Synthesis of -N-C:

[0048] (1) Weigh 500 mg of ZnCo-ZIF synthesized in Example 1 and dissolve it in 240 mL of ultrapure water, and stir at 500 rpm to form a uniform purple solution.

[0049] (2) After the solution was stirred for 15 minutes in step (1), 6 mL of cetyltrimethylammonium bromide was added successively to the above solution to dilute the aqueous solution (25 mg mL -1 ) and 10mL aqueous sodium hydroxide solution (6mg mL -1 ), and stirred for 15 minutes. Thereafter, tetraethyl orthosilicate (1.2 mL of a solution in 6 mL of methanol) was injected into the above solution to allow it to react.

[0050] (3) The reaction time in step (2) is 1-6h.

[0051] (4) Centrifuge and wash the materials synthesized at different times in step (3) to prepare silica-wrapped ZnCo-ZIF materials with different thicknesses (ZnCo-ZIF@mSiO 2 ).

[0052] (5) ZnCo-ZIF@mSiO obtained in step (4) 2 Heated at 450°C for 3h under Ar atmosphere, then...

Embodiment 3

[0054] Example 3 Porous concave cube Co NP @Co SA Synthesis of -N-C:

[0055] (1) take by weighing the Co synthesized by 40mg embodiment 2 SA -N-C black powder and a certain amount of cobalt acetylacetonate were placed on the upstream side and bottom of the porcelain boat, respectively.

[0056] (2) The mass of cobalt acetylacetonate in step (1) is 1-8 mg.

[0057] (3) Put the ceramic boat in the step (1) into the tube furnace and flush it with argon, then place the center of the furnace at 2°C min -1 The heating rate was raised to 180°C and kept at this temperature for 3h. Then at 5°C min -1 The rate was further raised to 900°C, held there for 3 hours for pyrolysis, and then cooled to room temperature.

[0058] The porous concave cube Co NP @Co SA The size of the -N-C catalyst is 200-400nm, and the size of Co particles is 5-15nm.

[0059] N2 adsorption isotherm test results, the porous concave cube Co NP @Co SA -N-C catalyst specific surface area is 804.3m 2 g -1...

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Abstract

The invention discloses a porous concave cubic CoNP@CoSA-N-C catalyst and its preparation method and application. The invention firstly prepares a ZnCo-ZIF cube with a size of about 200-400nm, and then wraps the ZnCo-ZIF cube on the surface of the cube. Covered with mesoporous silica coating to prepare ZnCo‑ZIF@mSiO 2 nanocubes; calcined at 700‑1000 °C in an inert gas environment, and then the silica layer was etched away to form porous concave cubic Co single-atom catalysts (Co SA ‑N‑C). In the second step, the organometallic gaseous sublimation doping method is used to increase the metal content, and the Co SA On the ‑N‑C carbon substrate, cobalt acetylacetonate is first evaporated at low temperature, then captured, then reduced at high temperature and stabilized on Co SA ‑N‑C carbon matrix, and finally synthesized a high-content Co metal catalyst. Simultaneous generation of highly active Co nanoparticles and Co‑N 4 Composite site (Co NP @Co SA ‑N‑C). The invention greatly improves the activity of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of nanometer catalytic materials, and in particular relates to a preparation method and application of porous concave cube-loaded Co metal particles and Co-N4 composite site carbon-based catalysts. Background technique [0002] Efficient and environmentally friendly proton exchange membrane fuel cells (PEMFCs) have been promoted as one of the most promising clean and sustainable energy conversion technologies. Currently, one of the most serious challenges in its successful initial commercialization is the development of highly active and stable long-lasting oxygen reduction reaction (ORR) electrocatalysts to overcome the inherent sluggish reaction kinetics of ORR at the cathode. Platinum group metal (PGM) catalysts are widely used as the best ORR catalysts. Unfortunately, the high cost, scarcity, and poor durability of Pt pose a major obstacle to the large-scale application of PEMFCs. In the past few years...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/9083H01M4/9041Y02E60/50
Inventor 姜艳霞程晓阳韩瑜孙世刚
Owner XIAMEN UNIV
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