Preparation method for skutterudite thermoelectric material

Abstract

The invention provides a preparation method for a skutterudite thermoelectric material, and belongs to the field of thermoelectric material preparation. The preparation method which is short in reaction time and controllable in reaction is provided and aims at solving the problems that an existing preparation method is long in reaction time and uncontrollable in reaction. The preparation method comprises the steps that 1, CoCl2.6H2O and SbCl3 serve as a reaction precursor, KBH4 is used as a reducing agent, and the reaction precursor is weighed with the mole ratio meeting the equation that Co:Sb=1:3; 2, absolute ethyl alcohol is added, a polyethylene glycol solvent and the reducing agent are added after the reaction precursor is dissolved sufficiently, and a microwave source is started for heating so as to conduct reaction; 3, in the reaction process, argon is injected, stirring is carried out, and a reaction product is sequentially cleaned through distilled water, ethanol and acetone after being subjected to centrifugal separation; and 4, after vacuum drying is conducted for 10 h at the temperature of 70 DEG C, the final product CoSb3 is obtained. The preparation method is short in time, the solvent or the raw material can be added conveniently as required, and the controllability of the reaction process is improved.

Description

technical field [0001] The invention belongs to the field of thermoelectric material preparation. Background technique [0002] Thermoelectric materials can be used for thermoelectric power generation and thermoelectric refrigeration, and have broad application prospects in many fields such as waste heat power generation, solar power generation, and cooling of electronic devices. Skutterudite (skutterudite) material, as one of the new high-performance thermoelectric materials, has ideal electrical properties, but the high thermal conductivity of the lattice prevents it from obtaining a high thermoelectric figure of merit, so it aims to reduce its thermal conductivity while at the same time The research on maintaining its good electrical properties has been ongoing, most of which focus on the preparation and performance research of bulk filling materials, while there are relatively few studies on reducing its thermal conductivity through nanostructuring. In the reaction of p...

AI Technical Summary

Problems solved by technology

Skutterudite (skutterudite) material, as one of the new high-performance thermoelectric materials, has ideal electrical properties, but the high thermal conductivity of the lattice prevents it from obtaining a high thermoelectric figure of merit, so it aims to reduce its thermal conductivity while at the same time The research on maintaining its good electrical properties has been ongoing, most of which focus on the preparation and performance research of bulk filling materials, while there are relatively few studies on reducing its thermal conductivity through nanostructuring. In the reaction of preparing Skutterudite by thermal or solvothermal method, the reaction is carried out under the conditions of sealing, high temperature and high pressure, the reaction process is difficult to control and observe, and the reaction time is longer