Preparation method of expanded graphite cerium oxide or graphene cerium oxide composite material

Abstract

The invention provides a preparation method of an expanded graphite / cerium oxide or graphene / cerium oxide composite material. The intercalation performance of the graphite is utilized, soluble ceriumchloride or cerium nitrate is inserted into expandable graphite in a solution, the expandable graphite is converted into expanded graphite and the cerium chloride or cerium nitrate is converted into cerium oxide through a high-temperature reaction, and an expanded graphite / cerium oxide composite material is generated in situ through a one-step method so that the expanded graphite and the cerium oxide are uniformly compounded and firmly combined. The graphene / cerium oxide composite material is prepared from the expanded graphite / cerium oxide composite material through ultrasonic stripping, andgraphene and cerium oxide can also achieve a uniform compounding effect. The process is simplified, and the operation is convenient; the preparation of the graphene / cerium oxide composite material from the expanded graphite / cerium oxide composite material is also easy to realize. The method is simple in process, low in equipment requirement and easy to amplify and produce in batches.

Description

technical field

[0001] The invention relates to the field of composite materials, in particular to a preparation method of expanded graphite / cerium oxide or graphene / cerium oxide composite materials. Background technique

[0002] Cerium oxide is an important rare earth oxide, which has important applications in the fields of catalysis, polishing, ultraviolet absorption, and solid fuel cells. The valence electronic structure of cerium makes it easy to change reversibly between trivalent and tetravalent, thus forming a large number of oxygen vacancies inside cerium oxide, resulting in strong redox ability and catalytic performance. It’s just that ordinary cerium oxide materials have small specific surface area, poor electrical conductivity, and high recombination rate of electron and hole pairs, which affects its performance and application effect. Expanded graphite and graphene have a large specific surface area and good electrical conductivity, which can efficiently dispers...

Examples

Embodiment 1

[0031] Put 10g of flake graphite into a beaker, add 200ml of 60% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 1g of potassium permanganate solid, stir in a 40°C water bath for 90min, collect the precipitate by filtration, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0032] Take 1g of expandable graphite and pour it into 100mL of cerium chloride solution (1g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring, and obtain the graphite intercalation compound intercalated with cerium chloride, put it in 600℃ The muffle furnace is used for 2 minutes, graphite expands, cerium chloride is decomposed into cerium oxide, and expanded graphite / cerium oxide composite material is generated.

[0033] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was...

Embodiment 2

[0035] Put 10g of flake graphite into a beaker, add 100ml of 80% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 5g of potassium permanganate solid, stir in a 40°C water bath for 90min, filter and collect the precipitate, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0036] Take 1g of expandable graphite and pour it into 40mL of cerium chloride solution (20g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring, and obtain the graphite intercalation compound intercalated with cerium chloride, put it in 700℃ In the muffle furnace for 90s, the graphite expands, and the cerium chloride is decomposed into cerium oxide, forming an expanded graphite / cerium oxide composite material.

[0037] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was obtaine...

Embodiment 3

[0039] Put 10g flake graphite into a beaker, add 50ml of 90% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 8g of potassium permanganate solid, stir in a 40°C water bath for 90min, filter and collect the precipitate, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0040] Take 1g of expandable graphite and pour it into 20mL of cerium chloride solution (100g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring to obtain graphite interlayer compound intercalated with cerium chloride, and put it in 1000℃ In the muffle furnace for 30s, graphite expands, cerium chloride is decomposed into cerium oxide, and expanded graphite / cerium oxide composite material is generated.

[0041] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was obtained by ultrason...

technical field

[0001] The invention relates to the field of composite materials, in particular to a preparation method of expanded graphite / cerium oxide or graphene / cerium oxide composite materials. Background technique

[0002] Cerium oxide is an important rare earth oxide, which has important applications in the fields of catalysis, polishing, ultraviolet absorption, and solid fuel cells. The valence electronic structure of cerium makes it easy to change reversibly between trivalent and tetravalent, thus forming a large number of oxygen vacancies inside cerium oxide, resulting in strong redox ability and catalytic performance. It’s just that ordinary cerium oxide materials have small specific surface area, poor electrical conductivity, and high recombination rate of electron and hole pairs, which affects its performance and application effect. Expanded graphite and graphene have a large specific surface area and good electrical conductivity, which can efficiently dispers...

Examples

Embodiment 1

[0031] Put 10g of flake graphite into a beaker, add 200ml of 60% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 1g of potassium permanganate solid, stir in a 40°C water bath for 90min, collect the precipitate by filtration, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0032] Take 1g of expandable graphite and pour it into 100mL of cerium chloride solution (1g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring, and obtain the graphite intercalation compound intercalated with cerium chloride, put it in 600℃ The muffle furnace is used for 2 minutes, graphite expands, cerium chloride is decomposed into cerium oxide, and expanded graphite / cerium oxide composite material is generated.

[0033] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was...

Embodiment 2

[0035] Put 10g of flake graphite into a beaker, add 100ml of 80% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 5g of potassium permanganate solid, stir in a 40°C water bath for 90min, filter and collect the precipitate, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0036] Take 1g of expandable graphite and pour it into 40mL of cerium chloride solution (20g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring, and obtain the graphite intercalation compound intercalated with cerium chloride, put it in 700℃ In the muffle furnace for 90s, the graphite expands, and the cerium chloride is decomposed into cerium oxide, forming an expanded graphite / cerium oxide composite material.

[0037] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was obtaine...

Embodiment 3

[0039] Put 10g flake graphite into a beaker, add 50ml of 90% sulfuric acid solution, stir in a 40°C water bath for 10min, gradually add 8g of potassium permanganate solid, stir in a 40°C water bath for 90min, filter and collect the precipitate, and wash the precipitate until the pH value is 5-7, drying the precipitate to obtain expandable graphite.

[0040] Take 1g of expandable graphite and pour it into 20mL of cerium chloride solution (100g / L), stir at room temperature for 3 hours, then evaporate the water to dryness while heating while stirring to obtain graphite interlayer compound intercalated with cerium chloride, and put it in 1000℃ In the muffle furnace for 30s, graphite expands, cerium chloride is decomposed into cerium oxide, and expanded graphite / cerium oxide composite material is generated.

[0041] 1 g of expanded graphite / cerium oxide composite was dispersed in 100 mL of N,N-dimethylformamide (DMF), and the graphene / cerium oxide composite was obtained by ultrason...

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