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A nanoparticle with grain boundaries, its preparation method and use

A nanoparticle and grain boundary technology, applied in the field of metal-metal oxide nanoparticles, to achieve the effect of improving stability, rich source of raw materials, and reducing agglomeration

Active Publication Date: 2021-05-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A nanoparticle with grain boundaries, its preparation method and use
  • A nanoparticle with grain boundaries, its preparation method and use
  • A nanoparticle with grain boundaries, its preparation method and use

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preparation example Construction

[0041] The preparation method of the nanoparticles with grain boundaries in the present invention is a solvothermal-solid phase calcination method. The precursor is first prepared by solvothermal method, and then further roasted to obtain nitrogen-doped metal-metal oxide nanoparticle powder with abundant grain boundaries. The obtained powder material has a spherical shape and a particle size of 3-20nm.

[0042] The specific steps are:

[0043] 1. Weigh an appropriate amount of metal salt (such as manganese salt, iron salt, cobalt salt, nickel salt, copper salt or zinc salt, etc.), organic nitrogen source (such as urea, melamine or amino acid, etc.) and glycerin, stir well, and the metal salt , The molar ratio of organic nitrogen source to glycerol is 1: (0.5-5): (10-100);

[0044] 2. Transfer the mixed solution obtained in step 1 to an autoclave with a polytetrafluoroethylene liner, heat and stir evenly, and react under airtight conditions at 100-180°C and autogenous pressure...

Embodiment 1

[0052] Mix 0.5g of cobalt acetate, 0.5g of nickel acetate, 1g of melamine, 5g of glycerin and 75mL of ethanol, and stir the obtained homogeneous solution into an autoclave PTFE liner; put the PTFE liner into the autoclave , sealed and placed in a constant temperature oven, and reacted in an oven at 180°C for 2h. After the reaction, cool down the autoclave, wait until the autoclave is cooled to room temperature, take out the hydrothermal precipitate, and after centrifugation and washing with ethanol, dry and grind the obtained solid to obtain a powder; place the dried powder in an inert atmosphere Calcined at 450°C for 2h, and then naturally cooled to room temperature to obtain nitrogen-doped metal-metal oxide nanoparticles with abundant grain boundaries.

[0053] Table 1 is the elemental composition of the obtained product measured by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy energy spectroscopy (TEM-EDS) in Example 1 (both are mole percent co...

Embodiment 2

[0059] Mix 0.5g of nickel sulfate, 0.5g of ferric sulfate, 1g of urea, 20.0g of glycerin and 60mL of ethanol, and stir the obtained homogeneous solution into an autoclave PTFE liner, and put the PTFE liner into the autoclave place in a constant temperature oven after sealing, and react in an oven at 150°C for 5 hours; after the reaction, cool down the autoclave, and when the autoclave drops to room temperature, take out the hydrothermal precipitate, centrifuge and wash with ethanol, then dry and grind The powder is obtained; the dried powder is placed in an inert atmosphere furnace and calcined at 400° C. for 3 hours, and then naturally cooled to room temperature to obtain a nitrogen-doped metal-metal oxide nanoparticle product with abundant grain boundaries.

[0060] Using the product obtained in Example 2 as an anode material, the potential of electrocatalytically decomposing water to produce oxygen is 1.52V vs. RHE, which exceeds that of RuO 2 and IrO 2 The performance lev...

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Abstract

The invention discloses a nano particle with a grain boundary, the grain boundary exists between crystals, and the crystal is a crystal grown together with a metal oxide and a metal; the outer layer of the nano particle is a carbon layer, and the Nanoparticles contain nitrogen. The invention also discloses a preparation method of the nanoparticle with grain boundaries and its application in electrocatalytic water splitting or zinc-air batteries. The nanoparticles with grain boundaries of the present invention are designed for the first time, and have excellent performance in electrocatalytic water splitting or zinc-air batteries.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to a nitrogen-doped metal-metal oxide nanoparticle with abundant grain boundaries, its preparation method and its electrocatalytic water splitting or application in zinc-air batteries. Background technique [0002] Bifunctional catalysts play a vital role in the production, conversion, and storage of new energy sources, such as water splitting, renewable fuel cells, and metal-air batteries. The reactions that occur in these energy devices are mainly oxygen reduction (ORR) reactions and oxygen evolution (OER) reactions, but these multi-step and multi-electron electrochemical reactions usually have high overpotentials and slow kinetics, thus requiring catalysts to reduce Reaction energy barrier, reducing process energy consumption. Most of the ideal catalysts with excellent performance widely reported are noble metal materials (such as ruthenium, iridium, platinum and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/08C25B1/04C25B11/091B82Y30/00
CPCB82Y30/00C25B1/04C25B11/04H01M4/9016H01M4/9041H01M4/9083H01M12/08Y02E60/36
Inventor 潘伦张蓉蓉邹吉军王涖张香文
Owner TIANJIN UNIV
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