Phosphorus-doped graphene oxygen reduction electro-catalyst and preparation method and application thereof

A phosphorus-doped graphene, electrocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, circuits, etc., can solve the problems of low activity, high cost, difficult preparation of oxygen reduction electrocatalysts, etc., and achieve reaction efficiency. High, high reducing activity, large specific surface area effect

Inactive Publication Date: 2014-01-08
CHINA WEST NORMAL UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of difficult preparation, low activity and high cost of existing oxygen reduction electrocatalysts, and to provide a metal-free phosphorus-doped graphene oxygen reduction electrocatalyst and its preparation method and application

Method used

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  • Phosphorus-doped graphene oxygen reduction electro-catalyst and preparation method and application thereof
  • Phosphorus-doped graphene oxygen reduction electro-catalyst and preparation method and application thereof
  • Phosphorus-doped graphene oxygen reduction electro-catalyst and preparation method and application thereof

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Embodiment

[0039] Embodiment: the preparation method of this doped graphene oxygen reduction electrocatalyst comprises the following steps,

[0040] Step 1) Preparation of graphite oxide: Add 2g of colloidal graphite and 1g of sodium nitrate into 46mL of concentrated sulfuric acid cooled in an ice bath, slowly add 6g of potassium permanganate in portions, keep stirring, and keep the temperature of the reaction system below 20°C. Then the temperature was raised to about 35 °C and stirring was continued for 20 h. Add 92mL of deionized water, and the temperature of the reaction system rises rapidly. After stirring for 30 min, add 142 mL of deionized water for dilution, and add 6 mL of hydrogen peroxide (30%) to obtain a yellow dispersion. Filter and wash with dilute hydrochloric acid (3.5%) until no SO 4 2- , and then washed with deionized water until neutral, and the resulting precipitate was vacuum-dried at 45°C for 24 hours to obtain graphite oxide.

[0041] Step 2) Uniform mixing of...

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Abstract

The invention relates to a catalyst, in particular to phosphorus-doped graphene oxygen reduction electro-catalyst and a preparation method and application thereof. The phosphorus-doped graphene oxygen reduction electro-catalyst contains oxidized graphene substrate and active phosphorus doped or attached to the surface and inside of the oxidized graphene substrate. The preparation method includes the steps of 1, preparing the oxidized graphene; 2, mixing the oxidized graphene with phosphorus-bearing precursor; 3, drying; 4, performing pyrolysis. The phosphorus-doped graphene oxygen reduction electro-catalyst is good oxygen reduction electro-catalyst, is high in catalytic activity and resistant to methanol poisoning and carbon monoxide poisoning, good in stability and capable of serving as electro-catalyst for fuel cells and metal-air cells and serving as electrode active material for electrochemical energy storage and conversion devices such as lithium ion cells, sodium ion cells, lithium-sulfur cells and supercapacitors, and is also applicable to the fields such as electrochemistry/biosensors.

Description

technical field [0001] The invention relates to a catalyst, in particular to a phosphorus-doped graphene oxygen reduction electrocatalyst and its preparation method and application. The phosphorus-doped graphene nanomaterial has broad application prospects in related fields such as fuel cells, metal-air batteries, lithium-ion batteries, sodium-ion batteries, supercapacitors, and electrochemical biosensors. Background technique [0002] Energy crisis and environmental pollution are major challenges facing human society in the 21st century. In order to promote sustainable economic and social development, research and development of clean and efficient new energy technologies and advanced materials has become a very urgent task. Fuel cell is a new type of green energy storage and conversion device, which has the advantages of high energy density, high energy conversion efficiency and zero emission. However, the electrochemical reduction process of oxygen at the fuel cell cath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/14H01M4/90
CPCY02E60/50
Inventor 苟兴龙李容
Owner CHINA WEST NORMAL UNIVERSITY
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