Skutterudite-based thermoelectric material and preparation method thereof
A technology of thermoelectric materials and skutterudite, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of thermoelectric material performance such as filling atom types and filling amount, and reduce lattice heat. Conductivity, improved performance, enhanced selective scattering
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[0032] The second aspect of the present invention provides a method for preparing a skutterudite-based thermoelectric material, comprising the following steps:
[0033] Step S1, preparing nano zinc oxide.
[0034]The step of preparing nanometer zinc oxide comprises the following substeps:
[0035] Sub-step S11, respectively configure a certain concentration of zinc salt solution and alkaline solution; heat the zinc salt solution at the first preset temperature and continue to stir, add the alkali solution dropwise to it during the stirring process, and continue stirring for a period of time after the dropwise addition time.
[0036] Wherein, the zinc salt is at least one of zinc chloride, zinc acetate and zinc nitrate; the alkaline substance is at least one of sodium hydroxide and potassium hydroxide. Zn in the zinc salt 2+ and the OH in the lye - The molar concentration ratio is 1:(1.7-2.4). The first preset temperature when heating the zinc salt is (50-80)°C; preferably...
Embodiment 1
[0063] Prepare 50ml of 1mol·L respectively -1 concentration of zinc chloride solution and 50ml of 1.7mol L -1 Sodium hydroxide solution, put the prepared zinc chloride solution in a 60°C water bath to heat at a constant temperature and continue to stir, then add the sodium hydroxide solution drop by drop to the zinc chloride solution, and keep the temperature after the dropwise addition Stir for 30min.
[0064] Then, 30 ml of CTAB with a mass concentration of 4 g / L was added dropwise to the suspension obtained above, and stirring was continued for 30 min after the addition was completed.
[0065] Then put the suspension obtained in the previous step in a microwave oven, heat the reaction for 3 minutes, centrifuge the product, and wash it with deionized water several times to obtain a precipitate; dry the precipitate at 80°C for 12 hours to obtain nano-oxidized Zinc particles.
[0066] Raw materials with a purity of ≧99% are used as initial raw materials, according to the ch...
Embodiment 2
[0071] Prepare 50ml of 1mol·L respectively -1 concentration of zinc acetate solution and 50ml of 2mol L -1 Place the prepared zinc acetate solution in a water bath at 60°C and heat it at a constant temperature with continuous stirring, then add the sodium hydroxide solution drop by drop to the zinc acetate solution, keep the temperature and continue stirring for 30 minutes after the addition is complete .
[0072]Then, 30 ml of CTAB with a mass concentration of 7 g / L was added dropwise to the suspension obtained above, and stirring was continued for 30 min after the addition was completed.
[0073] Then put the suspension obtained in the previous step in a microwave oven, heat and react for 6 minutes, centrifuge the product, and wash it with deionized water several times to obtain a precipitate; dry the precipitate at 80°C for 12 hours to obtain nano-oxidized Zinc particles.
[0074] Raw materials with a purity of ≧99% are used as initial raw materials, according to the che...
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