Nanometer perovskite/graphene composite material and preparation method thereof

A composite material and graphene technology, applied in the field of electrocatalytic materials, can solve the problems of reducing the specific capacity of the battery, deteriorating the conductive properties of activated carbon, and reducing the performance of the battery, and achieve the effects of improving utilization efficiency, low cost, and large contact area

Inactive Publication Date: 2012-07-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to create pores through activation or surface modification, but the conductive properties of the treated activated carbon will deteriorate, thereby reducing battery performance.
Moreover, the addition of pore-forming agents will also reduce the specific capacity of the battery.

Method used

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  • Nanometer perovskite/graphene composite material and preparation method thereof
  • Nanometer perovskite/graphene composite material and preparation method thereof
  • Nanometer perovskite/graphene composite material and preparation method thereof

Examples

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Embodiment 1

[0017] Using graphite paper as the anode, carbon rod as the cathode, and concentrated sulfuric acid (98% concentration) as the electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A. After stripping for 24 hours, the electrolyte solution was diluted 10 times with distilled water, and after the solution was cooled to room temperature, it was separated and filtered by a high-speed centrifuge at 12,000 rpm. The filtered powder was fully washed with distilled water until neutral, and dried at 50°C under a vacuum of 100 Pa to obtain a graphene oxide powder. Take 100 mg of the powder and add it into 100 mL of distilled water, and adjust its pH to 10 with ammonia water. Sonicate for 3 h at a power of 150 W to obtain a stable graphene oxide suspension. Add 1.5 mL of hydrazine hydrate dropwise to the above suspension, heat it in a constant temperature water bath at 80oC for 10h, wash the reactant until neutral, and dry it at 50oC under a vacuum of 100...

Embodiment 2

[0021] Using graphite paper as the anode, carbon rod as the cathode, and concentrated sulfuric acid (98% concentration) as the electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A. After stripping for 24 hours, the electrolyte solution was diluted 10 times with distilled water, and after the solution was cooled to room temperature, it was separated and filtered by a high-speed centrifuge at 12,000 rpm. The filtered powder was fully washed with distilled water until neutral, and dried at 50°C under a vacuum of 100 Pa to obtain a graphene oxide powder. Take 100 mg of the powder and add it into 100 mL of distilled water, and adjust its pH to 10 with ammonia water. Sonicate for 3 h at a power of 150 W to obtain a stable graphene oxide suspension. Add 1.5 mL of hydrazine hydrate dropwise to the above suspension, heat it in a constant temperature water bath at 80oC for 10h, wash the reactant until neutral, and dry it at 50oC under a vacuum of 100...

Embodiment 3

[0025] Using graphite paper as the anode, carbon rod as the cathode, and concentrated sulfuric acid (98% concentration) as the electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A. After stripping for 24 hours, the electrolyte solution was diluted 10 times with distilled water, and after the solution was cooled to room temperature, it was separated and filtered by a high-speed centrifuge at 12,000 rpm. The filtered powder was fully washed with distilled water until neutral, and dried at 50°C under a vacuum of 100 Pa to obtain a graphene oxide powder. Take 100 mg of the powder and add it into 100 mL of distilled water, and adjust its pH to 10 with ammonia water. Sonicate for 3 h at a power of 150 W to obtain a stable graphene oxide suspension. Add 1.5 mL of hydrazine hydrate dropwise to the above suspension, heat it in a constant temperature water bath at 80oC for 10h, wash the reactant until neutral, and dry it at 50oC under a vacuum of 100...

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Abstract

The invention relates to a nanometer perovskite / graphene composite material. The nanometer perovskite / graphene composite material is of a porous structure, the aperture of the nanometer perovskite / graphene composite material is about 0.5-1.5 microns, nanometer perovskite particles are distributed uniformly on a graphene film, and the average crystallite dimension of the composite material is about 10-20nm. A preparation method of the nanometer perovskite / graphene composite material comprises the following steps of: with graphite paper as an anode, a carbon rod as a cathode and concentrated sulfuric acid as an electrolyte, carrying out oxidation peeling to prepare a thin-layer graphene material, and then preparing graphene suspension from the thin-layer graphene material; adding nitrate and citric acid to the graphene suspension to enable the metal nitrate to be hydrolyzed to form sol, polymerizing the sol to form gel, finally drying and baking the gel to obtain the nanometer perovskite / graphene composite material. The preparation method disclosed by the invention has the advantages of simple process and low cost; and the nanometer perovskite / graphene composite material disclosed by the invention has good chemical uniformity; in addition, a reaction process is easy to control, and nanometer perovskite particles are more uniformly distributed on the graphene film and have smaller particle sizes, thus the nanometer perovskite / graphene composite material prepared by the method disclosed by the invention has excellent electro-catalysis performances and is suitable for being taken as an electro-catalysis material of a fuel cell.

Description

technical field [0001] The invention relates to an electrocatalytic material. Background technique [0002] Due to its high specific energy and stability, fuel cells have attracted much attention in the field of power batteries for electric vehicles. The development of this type of battery mainly comes from the continuous update of air electrode catalysts, so the research on its catalyst materials has always been the focus of attention. At present, precious metals have been extensively studied as oxygen reduction catalysts for fuel cells, and their catalytic performance is relatively ideal, but the cost is too high to achieve commercialization. Due to the stable structure and oxygen defects in the lattice structure, perovskite oxides have a good electrocatalytic effect on fuel cells as electrocatalytic materials and are cheap, so they have attracted widespread attention. The air electrode reaction is carried out on the three-phase interface of gas, solid and liquid. Whethe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90C01B31/04C01B32/19
CPCY02E60/50
Inventor 胡婕黄浩毛阿慧
Owner YANSHAN UNIV
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