Method for improving thermoelectric properties of bismuth sulfide polycrystal
A technology of thermoelectric properties and bismuth sulfide, applied in chemical instruments and methods, polycrystalline material growth, crystal growth, etc., can solve problems such as high electrical conductivity and low thermal conductivity, and achieve high electrical conductivity, low thermal conductivity, and high migration The effect of rate sum
Active Publication Date: 2012-05-09
香河汇文节能科技有限公司
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Therefore, for excellent polycrystalline thermoelectric materials, high electrical conductivity and low thermal conductivity are required, and there is a contradiction in the optimization of grain size. It is impossible to solve the problem of obtaining high electrical conductivity and low thermal conductivity by adjusting the grain size. rate of contradiction
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[0015] Bismuth sulfide nanopowder (MA powder) prepared by mechanical alloying method and (001) oriented single crystal bismuth sulfide nanorod (NR powder) synthesized by hydrothermal method were mixed in mass ratio, ultrasonically dispersed in absolute ethanol for 1 minute, Dry at 30-150°C for 30-300 minutes and grind by hand in an agate mortar. The ground powder is placed in a graphite mold, and a polycrystalline bismuth sulfide block is prepared by a spark plasma sintering process.
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Abstract
The invention relates to a method for improving thermoelectric properties of bismuth sulfide polycrystal and belongs to the technical field of energy materials. The method is characterized by comprising the following steps of: mixing bismuth sulfide nano powder prepared by a mechanical alloying method with (001)-oriented monocrystal bismuth sulfide nanorod powder synthesized by a hydrothermal method, ultrasonically dispersing in absolute ethanol for 10-200 minutes, drying and then manually grinding in an agate mortar for 10-100 minutes; and placing ground powder in a graphite mold, sintering at 300-500 DEG C by adopting a spark plasma sintering process, and maintaining the temperature for 0-30 minutes to prepare a bismuth sulfide polycrystal block. Because the spark plasma sintering process has high heating rate, thus the growth and fusion of crystals are inhibited, the monocrystal nanorod structure is retained in the polycrystal block to form a fast channel for carrier migration, and the electric transmission performance and thermoelectric property of the bismuth sulfide polycrystal are greatly improved; and the method has the advantages of simplicity in required equipment, easiness in operation, low cost, significant effect and the like.
Description
technical field [0001] The invention belongs to the technical field of energy materials, in particular to a method for improving the thermoelectric properties of bismuth sulfide polycrystals, and involves mechanical alloying, hydrothermal synthesis and discharge plasma sintering technologies. Background technique [0002] With the continuous development of social economy, environmental and energy issues are paid more and more attention by human beings. Thermoelectric materials can directly realize the mutual conversion of heat energy and electric energy. Thermoelectric devices are pollution-free, zero-emission, light in structure, small in size and long in life, and are increasingly attracting people's attention. Thermoelectric modules with thermoelectric devices as core components have broad application prospects in semiconductor refrigeration and thermoelectric batteries. In the competition with conventional refrigeration methods and traditional power sources, the key to ...
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IPC IPC(8): C30B28/02C30B29/46
Inventor 张波萍葛振华张丽娟韩成功
Owner 香河汇文节能科技有限公司
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