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Non-noble metal oxygen reduction electrocatalyst W/N/C and preparation method thereof

A non-precious metal, electrocatalyst technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as corrosion of the active center and overall structure of catalysts, and achieve improved energy conversion efficiency, high nitrogen Content, high active effect

Pending Publication Date: 2021-02-05
XTC NEW ENERGY MATERIALS(XIAMEN) LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inevitable generation of hydrogen peroxide in the ORR process, it is easy to undergo Fenton reaction with Fe ions in the catalyst to generate strong oxidizing free radicals, which seriously corrode the active center and overall structure of the catalyst.

Method used

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  • Non-noble metal oxygen reduction electrocatalyst W/N/C and preparation method thereof
  • Non-noble metal oxygen reduction electrocatalyst W/N/C and preparation method thereof
  • Non-noble metal oxygen reduction electrocatalyst W/N/C and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of ZIF-8: Zn(NO 3 ) 2 ·6H 2 O was dissolved in methanol to prepare A solution. Dissolve 2-methylimidazole in methanol to prepare solution B, in which Zn(NO 3 ) 2 ·6H 2 O, 2-methylimidazole and methanol, the molar ratio of the three substances is 1:9.0:184. Pour the B solution into the A solution, sonicate for 2 minutes, let it stand for 22 hours, centrifuge at 8000rpm for 4 minutes, wash with methanol, repeat the centrifugation-washing for 2 to 3 times, and dry the obtained white product in a vacuum drying oven at 80°C to obtain ZIF-8.

[0036] (2) Preparation of W / N / C catalyst: Add WCl to the mixed solvent of ethanol and Tris (trishydroxymethylaminomethane) buffer solution with a volume ratio of 1:1 6 , after ultrasonic dispersion, add ZIF-8, ultrasonic for 30min and then magnetically stir for 13h. ZIF-8, WCl 6 , ethanol and trishydroxymethylaminomethane, the mass ratio of the four substances is 1:0.04:157:0.48. Add methanol (v / v, methanol:sol...

Embodiment 2

[0038] (1) Preparation of ZIF-8: Zn(NO 3 ) 2 ·6H 2 O was dissolved in methanol to prepare A solution. Dissolve 2-methylimidazole in methanol to prepare solution B, in which Zn(NO 3 ) 2 ·6H 2O, 2-methylimidazole and methanol, the molar ratio of the three substances is 1:8.5:137. Pour solution B into solution A, ultrasonicate for 2 minutes, let stand for 20 hours, centrifuge at 8000 rpm for 4 minutes, wash with methanol, repeat centrifugation-washing 2 to 3 times, and dry the obtained white product in a vacuum drying oven at 80°C to obtain ZIF-8.

[0039] (2) Preparation of W / N / C catalyst: Add WCl to the mixed solvent of ethanol and Tris (trishydroxymethylaminomethane) buffer solution with a volume ratio of 1:1 6 , after ultrasonic dispersion, add ZIF-8, ultrasonic for 30min and then magnetically stir for 12h. ZIF-8, WCl 6 , ethanol and trishydroxymethylaminomethane, the mass ratio of the four substances is 1:0.02:157:0.48. Add methanol (v / v, methanol:solution=1:10) to...

Embodiment 3

[0041] (1) Preparation of ZIF-8: Zn(NO 3 ) 2 ·6H 2 O was dissolved in methanol to prepare A solution. Dissolve 2-methylimidazole in methanol to prepare solution B, in which Zn(NO 3 ) 2 ·6H 2 O, 2-methylimidazole and methanol, the molar ratio of the three substances is 1:9.5:230. Pour the B solution into the A solution, sonicate for 2 minutes, let it stand for 24 hours, centrifuge at 8000rpm for 4 minutes, wash with methanol, repeat the centrifugation-washing 2 to 3 times, and dry the obtained white product in a vacuum drying oven at 80°C to obtain ZIF-8.

[0042] (2) Preparation of W / N / C catalyst: Add WCl to the mixed solvent of ethanol and Tris (trishydroxymethylaminomethane) buffer solution with a volume ratio of 1:1 6 After ultrasonic dispersion, ZIF-8 was added, and magnetic stirring was performed for 14 hours after ultrasonic dispersion for 30 minutes. ZIF-8, WCl 6 , ethanol and trishydroxymethylaminomethane, the mass ratio of the four substances is 1:0.4:240:0.7...

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Abstract

The invention discloses a non-noble metal oxygen reduction electrocatalyst W / N / C and a preparation method thereof, and relates to the field of electrochemical catalytic materials. The non-noble metaloxygen reduction electrocatalyst W / N / C is tungsten-nitrogen co-doped porous carbon with rhombic dodecahedron morphology, the particle size of the catalyst is 100-200 nm, and the mass percentage of thetungsten element is 2%-5%. MOFs are adopted as a precursor, and a hollow carbon shell with the rhombic dodecahedron morphology is prepared after pyrolysis through the etching effect of an alkaline solution. The electrocatalyst has the advantages of micro-mesoporous-large-graded pore channel structure, high nitrogen content, rich active sites (porphyrin-like structure WNx and metal WNx phases) andsynergistic catalysis, has high ORR catalytic activity and stability, and has great significance in improving the key performances such as the energy conversion efficiency, the rate capability and the cycle life of a metal-air battery and a fuel battery.

Description

technical field [0001] The invention relates to the field of electrochemical catalytic materials, in particular to a non-noble metal oxygen reduction electrocatalyst W / N / C and a preparation method thereof. Background technique [0002] The depletion of fossil energy and severe environmental problems have promoted the development of new energy systems. Metal-air batteries and fuel cells have the advantages of high energy conversion efficiency, high energy density, and low environmental pollution. They have broad application prospects in portable power supplies, power supplies, and fixed power stations. Related research has great significance for future large-scale energy storage and mobile storage. Important scientific significance and practical value. Both fuel cells and metal-air batteries involve oxygen reduction reaction (oxygen reduction reaction, ORR). In order to speed up the inherent slow kinetic process of oxygen reduction reaction, catalysts are needed. Currently,...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J27/24
CPCH01M4/90B01J27/24B01J35/39Y02E60/50
Inventor 于洋涂腾秀曾雷英周尧李君涛
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD