A kind of bulk graphene/cage composite material and preparation method thereof
A composite material and bulk graphite technology, which is applied in the field of bulk graphene/clathrate composite material and its preparation, can solve the problems of destroying electrical conductivity, reducing thermal conductivity, small thermal conductivity, etc., so as to reduce thermal conductivity. efficiency, optimized conductivity, optimized performance
Inactive Publication Date: 2017-04-05
EAST CHINA UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Due to the unique properties of nanomaterials, especially the very small thermal conductivity, the combination of traditional thermoelectric materials and nanomaterials has become a new research hotspot, such as the more studied Yb 2 o 3 / skutterudite composite material, this type of composite material can greatly reduce the thermal conductivity of the material, but at the same time it will destroy the good electrical conductivity of the material, thus affecting its application
There are no detailed reports on graphene / skutterudite composites
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0024] Example: 5% Graphene / CoGe 1.5 Se 1.5 Composite materials and methods for their preparation.
[0025] (1) Weigh the metals Co (0.308g), Ge (0.571g) and Se (0.621g) respectively, mix them evenly and seal them into the quartz tube, the vacuum degree of the quartz tube is at least 10 -3 mbar. The material is subjected to high-temperature annealing, the annealing temperature is 500-800° C., the annealing time is 1-5 days, and then quenched in an ice-water bath to maintain the high-temperature phase. The resulting high-purity CoGe 1.5 Se 1.5 compound;
[0026] (2) Slowly add 3g of flake graphite to a mixture of 360mL of concentrated sulfuric acid and 40mL of phosphoric acid (9:1) at room temperature (below 20°C), then slowly add 18g of potassium permanganate into the mixture, and finish adding Then heat up to 50°C for 12 hours, wash and dialyze, and obtain a large-sheet graphene oxide dispersion after ultrasonic treatment; dry the dispersion at 50°C under vacuum, and th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a bulk graphene / clathrate composite material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The composite material is: (w% graphene) / CoGexSe3‑x (1.0≤x≤2.0, 0<w%<20%). In the present invention, CoGexSe3‑x is first prepared from metal elements Co, Ge and Se as raw materials, and then graphene oxide is prepared using a chemical exfoliation method. After being ground into powder, it is mixed with CoGexSe3‑x in proportion and then heat-treated and quenched to obtain graphene / CoGexSe3‑x composite materials are processed under high temperature and high pressure to obtain dense, regular-shaped block graphene / CoGexSe3‑x composite materials. Compared with the thermoelectric material matrix without graphene composite, the material of the present invention has higher electrical conductivity and lower thermal conductivity. Its preparation method has low cost and high yield, and is suitable for large-scale industrial production.
Description
technical field [0001] The invention relates to a bulk graphene / cage composite material and a preparation method thereof, belonging to the technical field of thermoelectric materials. Background technique [0002] Thermoelectric material is a functional material that can directly convert heat energy and electric energy. It is mainly used in aviation power supplies and refrigerators. It has broad application prospects in automobile exhaust and industrial waste heat power generation. The main bottleneck of current research is thermoelectric conversion. less efficient. The thermoelectric conversion efficiency can be expressed by the dimensionless factor ZT, ZT=S 2 σT / κ, where T is the absolute temperature; S is the Seebeck coefficient; σ is the electrical conductivity; κ is the total thermal conductivity, including electronic thermal conductivity and lattice thermal conductivity. [0003] The skutterudite material has a cage structure, so it is also considered as a kind of cl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/16H10N10/852
Inventor 梁莹李飞方斌
Owner EAST CHINA UNIV OF SCI & TECH