Preparation method and application of CuO/graphene composite material

Abstract

The invention discloses a preparation method and application of a CuO / graphene composite material. The CuO / graphene composite material is successfully prepared from a copper salt and an environment-friendly reducing agent through one-step hydrothermal reduction, the specific surface area of the composite material is 150.1 m<2> / g, and the composite material shows excellent degradation performance on organic wastewater as a catalyst; and as a lithium ion negative electrode material, the composite material has relatively large reversible capacity and cycling stability, the first reversible capacity reaches 784.7 mAhg<-1>, and the retention rate after 50 cycles is 87.4%. The preparation method is simple, convenient to operate, low in cost and short in preparation period. The material can be used in the fields of supercapacitor electrode materials, lithium ion battery electrode materials, photosensitive materials, heterogeneous catalysis, photoelectrocatalysis, solar cells and the like.

Description

technical field

[0001] The invention belongs to the field of clean preparation of graphite-based composite materials, and in particular relates to a preparation method and application of a CuO / graphene composite material with excellent comprehensive performance. Background technique

[0002] Copper oxide (CuO) is a typical p-type semiconductor transition metal oxide. Since the bandgap width is 1.2-1.9eV, it belongs to a narrow bandgap semiconductor, so it has a high specific capacitance. Copper oxide preparation raw materials have a wide range of sources, and the preparation cost is low. Nano-scale CuO has the characteristics of large specific surface area, high reactivity and strong selectivity, and shows excellent catalytic effect in many reactions. It is widely used in semiconductors, photocatalysis, solar cells, lithium batteries, sensors, electrochemical detection and many other fields.

[0003] Graphene is a two-dimensional crystalline material made of carbon atoms h...

Examples

Embodiment 1

[0032] Weigh 0.61 g of copper nitrate, 0.25 g of potassium hydroxide and 22.3 mL of deionized water, add the weighed material into a reactor with a magnetic stirring device, react at 25 ° C for 45 min, and then add 0.2 g of graphene and 0.41 g of ascorbic acid were added to the above solution in turn, stirred evenly, then transferred into a hydrothermal kettle, and hydrothermally reacted at 180°C for 4 h. After drying, a CuO / graphene composite material is obtained. The specific surface area is 137.2 m2 / g.

Embodiment 2

[0034]Weigh 3.06 g of copper sulfate, 1.22 g of sodium carbonate and 61.2 mL of deionized water, add the weighed material into a reactor with a magnetic stirring device, react at 40 °C for 25 min, and then add 1.0 g of graphene and 5.16 g of glucose were sequentially added to the above solution, stirred evenly, and then transferred into a hydrothermal kettle for a hydrothermal reaction at 160°C for 2 h. Dry to obtain CuO / graphene composites. The specific surface area is 130.9m2 / g.

Embodiment 3

[0036] Weigh 1.84 g of copper carbonate, 0.74 g of ammonia water and 46.7 mL of deionized water, transfer the weighed material into a reactor with a magnetic stirring device, react at 30 °C for 50 min, and then mix 0.6 g of graphene with 2.5 gPEG200 was added to the above solution in turn, stirred evenly, moved into a hydrothermal kettle, and reacted hydrothermally at 100°C for 14 h. After the reaction was completed, after the reaction kettle was cooled to room temperature, it was suction filtered, washed with water and absolute ethanol, and vacuum-dried to obtain CuO / graphene composites. The specific surface area is 140.1 m2 / g.

technical field

[0001] The invention belongs to the field of clean preparation of graphite-based composite materials, and in particular relates to a preparation method and application of a CuO / graphene composite material with excellent comprehensive performance. Background technique

[0002] Copper oxide (CuO) is a typical p-type semiconductor transition metal oxide. Since the bandgap width is 1.2-1.9eV, it belongs to a narrow bandgap semiconductor, so it has a high specific capacitance. Copper oxide preparation raw materials have a wide range of sources, and the preparation cost is low. Nano-scale CuO has the characteristics of large specific surface area, high reactivity and strong selectivity, and shows excellent catalytic effect in many reactions. It is widely used in semiconductors, photocatalysis, solar cells, lithium batteries, sensors, electrochemical detection and many other fields.

[0003] Graphene is a two-dimensional crystalline material made of carbon atoms h...

Examples

Embodiment 1

[0032] Weigh 0.61 g of copper nitrate, 0.25 g of potassium hydroxide and 22.3 mL of deionized water, add the weighed material into a reactor with a magnetic stirring device, react at 25 ° C for 45 min, and then add 0.2 g of graphene and 0.41 g of ascorbic acid were added to the above solution in turn, stirred evenly, then transferred into a hydrothermal kettle, and hydrothermally reacted at 180°C for 4 h. After drying, a CuO / graphene composite material is obtained. The specific surface area is 137.2 m2 / g.

Embodiment 2

[0034]Weigh 3.06 g of copper sulfate, 1.22 g of sodium carbonate and 61.2 mL of deionized water, add the weighed material into a reactor with a magnetic stirring device, react at 40 °C for 25 min, and then add 1.0 g of graphene and 5.16 g of glucose were sequentially added to the above solution, stirred evenly, and then transferred into a hydrothermal kettle for a hydrothermal reaction at 160°C for 2 h. Dry to obtain CuO / graphene composites. The specific surface area is 130.9m2 / g.

Embodiment 3

[0036] Weigh 1.84 g of copper carbonate, 0.74 g of ammonia water and 46.7 mL of deionized water, transfer the weighed material into a reactor with a magnetic stirring device, react at 30 °C for 50 min, and then mix 0.6 g of graphene with 2.5 gPEG200 was added to the above solution in turn, stirred evenly, moved into a hydrothermal kettle, and reacted hydrothermally at 100°C for 14 h. After the reaction was completed, after the reaction kettle was cooled to room temperature, it was suction filtered, washed with water and absolute ethanol, and vacuum-dried to obtain CuO / graphene composites. The specific surface area is 140.1 m2 / g.

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