B and N co-doped Co-based high-active oxygen reduction electrocatalyst as well as preparation and application thereof

An electrocatalyst and co-doping technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as complex patent process and environmental hazards, and achieve the effects of avoiding application restrictions, improving product performance, and overcoming the decline in catalytic activity

Pending Publication Date: 2021-11-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of preparation method, the patent process is relatively complicated, and strong acid, strong alkali, strong oxidant, etc. are used, which cause great harm to the environment

Method used

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  • B and N co-doped Co-based high-active oxygen reduction electrocatalyst as well as preparation and application thereof
  • B and N co-doped Co-based high-active oxygen reduction electrocatalyst as well as preparation and application thereof
  • B and N co-doped Co-based high-active oxygen reduction electrocatalyst as well as preparation and application thereof

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preparation example Construction

[0033] A method for preparing a Co-based highly active oxygen reduction electrocatalyst co-doped with B and N, specifically comprising the following steps:

[0034] (1) Dissolve 1,3,5-benzenetricarboxylic acid, dicyandiamide, boric acid, and cobalt source in a solvent, and use ultrasonic dissolution to fully react to form a product. The reaction temperature is 50-70°C, and the reaction time is 10-14h, in this step, the cobalt ions in the cobalt source are doped into the carbon support, wherein the cobalt source is CoCl 2 ·6H 2 O, 1,3,5-benzenetricarboxylic acid, dicyandiamide, CoCl 2 ·6H 2 The mass ratio of O and boric acid is 1:10:(0.4~0.6):(0.025~0.075), and the solvent is that ethanol and water are obtained by mixing 1:3.5 by volume;

[0035] (2) Collect the product of step (1) and dry it under vacuum condition, the drying temperature is 50-70°C, and the drying time is 7-10 hours;

[0036] (3) Annealing the obtained dried product under an inert gas, the temperature of t...

Embodiment 1

[0040] A B, N co-doped Co-based highly active oxygen reduction electrocatalyst for fuel cells is obtained by the following preparation steps:

[0041] (1) According to the mass ratio of 1:10:0.5:0.05, take 0.1g of 1,3,5-benzenetricarboxylic acid, 1g of dicyandiamide, 50mg of cobalt chloride hexahydrate, 5mg of boric acid and dissolve in volume ratio of In a mixed solvent of ethanol / water of 1:3.5, ultrasonically dissolved, and reacted at 60° C. for 12 hours to obtain the product.

[0042] (2) The above reaction system was centrifuged to collect the product, and the product was vacuum-dried at 60° C. for 8 hours.

[0043](3) Place the obtained dried product in a porcelain boat and anneal at 900°C for 2 h under an argon atmosphere, and then cool to room temperature to obtain B and N co-doped carbon nanosheets dispersed with Co nanoparticles, denoted as Co NPs-BNC.

[0044] TEM image of Co NPs-BNC figure 1 As shown, it can be seen that the overall profile of the catalyst is a ...

Embodiment 2

[0058] A B, N co-doped Co-based highly active oxygen reduction electrocatalyst for fuel cells is obtained by the following preparation steps:

[0059] (1) According to the mass ratio of 1:10:0.5:0.025, take 0.1g of 1,3,5-benzenetricarboxylic acid, 1g of dicyandiamide, 50mg of cobalt chloride hexahydrate, 2.5mg of boric acid and dissolve in volume ratio In a mixed solvent of ethanol / water of 1:3.5, ultrasonically dissolved, and reacted at 60° C. for 12 hours to obtain the product.

[0060] (2) The above reaction system was centrifuged to collect the product, and the product was vacuum-dried at 60° C. for 8 hours.

[0061] (3) The obtained dried product was placed in a porcelain boat and annealed at 900° C. for 2 h under an argon atmosphere, and then cooled to room temperature to obtain B and N co-doped carbon nanosheets dispersed with Co nanoparticles.

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Abstract

The invention relates to a B and N co-doped Co-based high active oxygen reduction electrocatalyst and preparation and application thereof. The preparation method specifically comprises the following steps: (1) dissolving 1, 3, 5-benzene tricarboxylic acid, dicyandiamide, boric acid and a cobalt source in a solvent, and after dissolving, fully reacting to generate a product; (2) collecting a product in the step (1) and drying; and (3) carrying out annealing treatment on the obtained dried product to obtain B and N co-doped carbon nanosheet dispersed with Co nanoparticles. The catalyst is used in a fuel cell. Compared with the prior art, the CoNPs-BNC provided by the invention has a hierarchical porous two-dimensional lamellar structure, and shows better oxygen reduction electrocatalytic activity, stability and methanol resistance than commercial Pt/C.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a B and N co-doped Co-based high-activity oxygen reduction electrocatalyst and its preparation and application. Background technique [0002] The rapid economic and social development has accelerated the continuous growth of global energy consumption. To date, a significant portion (more than 80%) of global energy supply still comes from fossil fuels. However, fossil fuels are an unsustainable type of energy with limited reserves, and the use of fossil fuels can even seriously pollute the environment. Therefore, electrochemical energy storage and conversion technologies, such as fuel cells and zinc-air batteries, have entered people's field of vision due to their advantages of low or zero emissions and high efficiency. Oxygen reduction reaction (ORR) is a key reaction in this advanced energy storage and conversion technology. However, the kinetics of this multi-electron transfer proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083B82Y30/00B82Y40/00Y02E60/50
Inventor 李巧霞孙笑含帖晓国张钰睿付鑫朱晓琪
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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