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Preparation method and application of porous graphite

A technology of porous graphene and straw, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of graphene electrode materials that are difficult to meet large-scale production, complex preparation process, high cost, etc., to increase added value , simple process and low cost

Inactive Publication Date: 2017-09-08
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the complex preparation process and high cost, graphene electrode materials are still difficult to meet the needs of mass production

Method used

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  • Preparation method and application of porous graphite
  • Preparation method and application of porous graphite
  • Preparation method and application of porous graphite

Examples

Experimental program
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Embodiment 1

[0036] Weigh 1.9g Ni(NO 3 ) 2 ·6H 2 O was fully dissolved in 120 mL of deionized water to prepare a nickel salt solution. Soak 8 g of clean rice stalks in the nickel nitrate aqueous solution for 12 hours, and transfer to a blast oven at 60° C. for drying. The dried sample was placed in a tube furnace, and the temperature was raised to 400° C. for 1 h at a rate of 5° C. / min in a nitrogen atmosphere to obtain a carbonized precursor. Weigh 3g of the carbonized precursor and soak it in 36mL of 6M KOH solution for 2h, and then transfer it to a 60°C blast oven for drying. The dried sample was placed in a tube furnace, heated to 700°C at a rate of 10°C / min under a nitrogen atmosphere and kept for 1 hour, and then cooled with the furnace. Soak the obtained material in pure water for 12 hours, filter and wash until neutral; then soak the material in 1M HNO 3 After 12 hours in the solution, filter, and finally wash with pure water to neutrality, dry the obtained material in a blast...

Embodiment 2

[0041] Weigh 0.3g Ni(NO 3 ) 2 ·6H 2O was fully dissolved in 120 mL deionized water to prepare a nickel salt solution. Soak 8g of clean rice stalks in nickel nitrate solution for 12h, and transfer them to a blast oven at 60°C for drying. Place the dried sample in a tube furnace, heat it up to 500°C at a rate of 5°C / min in a nitrogen atmosphere and keep it warm for 1 hour to obtain a carbonized precursor material; weigh 3g of the carbonized precursor and soak it into 36mL of 6M KOH solution 2h, and then transferred to 60 ℃ blast oven for drying. The dried samples were placed in a tube furnace and heated to 800 °C for 1 h at a rate of 10 °C / min under a nitrogen atmosphere, and then cooled with the furnace. Soak the obtained material in pure water for 12h, filter and wash until neutral, and then soak the material in 1M HNO 3 In the solution for 12 hours, filtered, and finally washed with pure water to neutrality, the obtained material was dried in a blast oven at 100°C to obt...

Embodiment 3

[0044] Weigh 1.6g C 4 h 6 o 4 Ni·4H 2 O (nickel acetate) was fully dissolved in 120mL deionized water to prepare a nickel salt solution. Soak 8g of clean wheat straw in nickel acetate solution for 12h, and transfer to a blast oven at 60°C for drying. Place the dried sample in a tube furnace, and heat it up to 400°C at a rate of 10°C / min in a nitrogen atmosphere for 1 hour to obtain a carbonized precursor material; weigh 3g of the carbonized precursor and soak it into 54mL of 6M KOH solution 2h, and then transferred to 60 ℃ blast oven for drying. The dried samples were placed in a tube furnace and heated to 900 °C for 1 h at a rate of 10 °C / min under a nitrogen atmosphere, and then cooled with the furnace. Soak the obtained material in pure water for 12 hours, filter and wash until neutral, then soak the material in 1M HCl solution for 12 hours, filter, and finally wash with pure water until neutral, then place the obtained material in a blast oven at 100°C After drying, ...

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Abstract

The invention relates to a preparation method of porous graphite. The preparation method comprises the steps that a straw biomass is soaked in a water solution of nickel salt and dried at the temperature of 40 DEG C to 100 DEG C, and a nickel salt treated straw biomass is obtained; in the inert atmosphere, the nickel salt treated straw biomass is carbonized at the temperature of 350 DEG C to 500 DEG C, and a carbonized product is obtained; the carbonized product is soaked into a water solution of alkali, activating treatment is performed in the inert atmosphere and at the temperature of 600 DEG C to 1,000 DEG C, the carbonized product is cooled and washed to be neutral, and the porous graphite is obtained. The invention further provides application of the porous graphite prepared with the method as a capacitor. The method is simple in technology, high in repeatability and suitable for large-scale batch production, and the porous graphite prepared with the method has the advantages that the specific surface area is high, the electric conductivity is good and the capacitive performance is excellent.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a preparation method and application of porous graphene. Background technique [0002] The development of new green energy such as solar energy, wind energy, and tidal energy has brought new opportunities for the improvement of traditional energy crises and environmental problems. However, limited by the regional limitations and discontinuity of new energy sources, the development of high-performance energy storage devices has become a current research hotspot. According to different energy storage mechanisms and application fields, energy storage devices can be roughly divided into secondary batteries, fuel cells, and supercapacitors. In recent years, due to the outstanding power performance, long cycle life, safety, and environmental friendliness of supercapacitors, it not only fills the gap between ordinary secondary batteries and traditional capacitors, but also provides n...

Claims

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Application Information

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IPC IPC(8): C01B32/184H01G11/24H01G11/44H01G11/36
CPCY02E60/13H01G11/24C01B2204/32C01P2004/04C01P2006/16H01G11/36H01G11/44
Inventor 胡景鹏宋时雪连崑金宏宗平张慧吴世超
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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