Method for synchronously preparing hierarchical pore cobalt and nitrogen co-doped nanorod loaded platinum-cobalt alloy nano oxygen reduction electrocatalyst

A catalyst and reducing agent technology, applied in the field of electrochemical energy conversion electrocatalytic materials, can solve the problem of improving the catalytic effect of nano-catalytic materials for oxygen reduction reaction, limiting the large-scale production of MOFs materials, and the inability of active sites to obtain oxygen mass transfer channels and other problems, to achieve the effect of being suitable for large-scale production, excellent electrochemical performance, and improving catalytic effect

Pending Publication Date: 2020-09-11
GUANGXI UNIV
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Problems solved by technology

However, ZIP8 still has defects. In the oxygen reduction reaction, the kinetics of the dissociation and adsorption reaction of oxygen molecules is heavily dependent on the diffusion rate of oxygen. Since the ZIP8-derived carbon material has a positive dodecahedral structure and contains a large number of microporous structures, in the reaction It will be submerged by the generated water, which will cause a large number of active sites to fail to obtain sufficient oxygen mass transfer channels in the actual reaction, causing a large number of active sites to fail. Therefore, its structure does not have the characteristics

Method used

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  • Method for synchronously preparing hierarchical pore cobalt and nitrogen co-doped nanorod loaded platinum-cobalt alloy nano oxygen reduction electrocatalyst
  • Method for synchronously preparing hierarchical pore cobalt and nitrogen co-doped nanorod loaded platinum-cobalt alloy nano oxygen reduction electrocatalyst
  • Method for synchronously preparing hierarchical pore cobalt and nitrogen co-doped nanorod loaded platinum-cobalt alloy nano oxygen reduction electrocatalyst

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1 synchronous method prepares PtCo / Co-N-C catalyst

[0034] (1) Mix 168mg of cobalt nitrate hexahydrate and 56mg zinc nitrate hexahydrate under the conditions of room temperature and magnetic stirring and homogenize it with 20mL of ultrapure water; then add 20mL of 2-methylimidazole with a concentration of 10mg / mL solution, stirred for 2h to mix and react to obtain the first mixed solution; in this step, the Co / Zn precursor and 2-methylimidazole will form a chelate with a certain shape;

[0035] (2) Add 20 mL of sodium borohydride aqueous solution with a concentration of 10 mg / mL into the first mixed solution, and react for 2 hours while stirring to obtain the first black suspension; in this step, the addition of sodium borohydride will change the chemical The environment of the reaction (such as: changing the pH value, reducing the valence state of the metal ion), so that the coordination environment of the metal ion changes, the induced structure changes, a...

Embodiment 2

[0042] Embodiment 2 prepares Co-N-C nanorods

[0043] (1) Mix 168mg of cobalt nitrate hexahydrate and 56mg zinc nitrate hexahydrate under the conditions of room temperature and magnetic stirring and homogenize it with 20mL of ultrapure water; then add 20mL of 2-methylimidazole with a concentration of 10mg / mL Aqueous solution, stirred for 2h to mix and react to obtain the first mixed solution;

[0044] (2) Add 20mL of sodium borohydride aqueous solution with a concentration of 10mg / mL to the first mixed solution, and react for 2h while stirring to obtain the first black suspension, that is, an amorphous Co-B-O suspension

[0045] (3) Wash the first black suspension with ultrapure water, then centrifuge, wash with ethanol after centrifugation, and centrifuge again, repeat 3 times, and finally vacuum-dry the product obtained by centrifugation at 60°C for 8 hours, and then dry The final sample was annealed at a high temperature of 950° C. in an atmosphere of hydrogen-argon mixed ...

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Abstract

The invention discloses a method for synchronously preparing a PtCo/Co-N-C catalyst. The preparation method comprises the following steps: homogenizing cobalt salt, zinc salt and ultrapure water, adding a 2-methylimidazole aqueous solution, uniformly stirring, adding a strong reducing agent aqueous solution, carrying out a mixing reaction, adding a platinum salt aqueous solution, carrying out a mixing reaction, centrifuging the product, cleaning, drying, and carrying out high temperature annealing in an inert gas environment to obtain the PtCo/Co-N-C catalyst. The method is simple and easy tooperate. The material with the PtCo nano-particle structure loaded on the Co-N-C nano-rod with the hollow structure is rapidly prepared. The preparation method is simple in process, easy to operate, suitable for large-scale production, short in reaction time, low in cost and clean, and the prepared PtCo/Co-N-C catalyst is used as a cathode oxygen reduction reaction catalyst of a hydrogen-oxygen fuel cell and shows excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials for electrochemical energy conversion, and relates to a method for synchronously preparing hierarchically porous cobalt and nitrogen co-doped nanorod-supported platinum-cobalt alloy nano-oxygen reduction electrocatalysts. Background technique [0002] The development of energy is an important driving force for the development of the national economy and is closely related to the survival and development of human beings. Coal, oil and natural gas are the three major fossil fuels that are non-renewable resources. In the past few decades, due to the continuous exploitation of fossil fuels, the global energy crisis has become more and more serious. At the same time, the use of fossil fuels produces a large amount of toxic and harmful substances, which not only have adverse effects on human health, but also pose a serious threat to the natural environment on which people depend. In ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92B82Y30/00B82Y40/00
CPCH01M4/8825H01M4/921H01M4/926H01M4/9083H01M4/9041B82Y30/00B82Y40/00H01M2004/8689Y02E60/50
Inventor 田植群莫荣成张潇然沈培康
Owner GUANGXI UNIV
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