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ZnO-based thermoelectric ceramic with high thermoelectric performance and preparation method thereof
The invention relates to ZnO-based thermoelectric ceramic which is found to have high thermoelectric performance for the first time and a preparation method of the ZnO-based thermoelectric ceramic. The preparation method comprises the following steps: preparing ZnO particle powder (with a particle size of 5 nm to 1 [mu] m) with regular morphology and uniform particle size by using a hydrothermal synthesis method or a solution synthesis method, generating a ZnS layer in situ on the surface of ZnO particles by using Na2S, thioacetamide, thiourea and the like as a sulfur source (with a concentration of 0.1 to 1 mol/L) through an ion exchange method or a self-assembly method, and carrying out cold isostatic pressing on the obtained ZnO/ZnS powder to obtain the ZnO/ZnS composite material. The ZnO-based thermoelectric ceramic with high strength and high thermal stability is prepared by adopting a microwave sintering process, the highest thermoelectric figure of merit (ZT) of the ZnO-based thermoelectric ceramic at 900K reaches 1.77, and the problem that the ZnO-based thermoelectric material is difficult to realize the practical application requirement that ZT is greater than 1 for a long time is solved. In addition, the preparation method is simple in process, ingenious in design and low in cost.
本发明涉及一种首次发现其具有高热电性能的ZnO基热电陶瓷及其制备方法。采用水热合成法或溶液合成法制备形貌规则、粒度均匀的ZnO颗粒粉末(粒径5nm‑1μm)，再以Na2S、硫代乙酰胺、硫脲等为硫源(浓度0.1‑1mol/L)通过离子交换法或自组装法在ZnO颗粒表面原位生成ZnS层，获得的ZnO/ZnS粉体经冷等静压成型后，采用微波烧结工艺制备出具有高强度、高热稳定性的ZnO基热电陶瓷，该ZnO基热电陶瓷在900K的最高热电优值(ZT)达到了1.77，打破了长期以来ZnO基热电材料难以实现ZT＞1的实际应用要求。另外，本发明的制备方法工艺简单，设计巧妙，成本低廉。
ZnO-based thermoelectric ceramic with high thermoelectric performance and preparation method thereof
The invention relates to ZnO-based thermoelectric ceramic which is found to have high thermoelectric performance for the first time and a preparation method of the ZnO-based thermoelectric ceramic. The preparation method comprises the following steps: preparing ZnO particle powder (with a particle size of 5 nm to 1 [mu] m) with regular morphology and uniform particle size by using a hydrothermal synthesis method or a solution synthesis method, generating a ZnS layer in situ on the surface of ZnO particles by using Na2S, thioacetamide, thiourea and the like as a sulfur source (with a concentration of 0.1 to 1 mol/L) through an ion exchange method or a self-assembly method, and carrying out cold isostatic pressing on the obtained ZnO/ZnS powder to obtain the ZnO/ZnS composite material. The ZnO-based thermoelectric ceramic with high strength and high thermal stability is prepared by adopting a microwave sintering process, the highest thermoelectric figure of merit (ZT) of the ZnO-based thermoelectric ceramic at 900K reaches 1.77, and the problem that the ZnO-based thermoelectric material is difficult to realize the practical application requirement that ZT is greater than 1 for a long time is solved. In addition, the preparation method is simple in process, ingenious in design and low in cost.
本发明涉及一种首次发现其具有高热电性能的ZnO基热电陶瓷及其制备方法。采用水热合成法或溶液合成法制备形貌规则、粒度均匀的ZnO颗粒粉末(粒径5nm‑1μm)，再以Na2S、硫代乙酰胺、硫脲等为硫源(浓度0.1‑1mol/L)通过离子交换法或自组装法在ZnO颗粒表面原位生成ZnS层，获得的ZnO/ZnS粉体经冷等静压成型后，采用微波烧结工艺制备出具有高强度、高热稳定性的ZnO基热电陶瓷，该ZnO基热电陶瓷在900K的最高热电优值(ZT)达到了1.77，打破了长期以来ZnO基热电材料难以实现ZT＞1的实际应用要求。另外，本发明的制备方法工艺简单，设计巧妙，成本低廉。
ZnO-based thermoelectric ceramic with high thermoelectric performance and preparation method thereof
一种具有高热电性能ZnO基热电陶瓷及其制备方法
DU XUELI (Autor:in) / GUO XIAOHUI (Autor:in) / ZHANG GUANGYUE (Autor:in)
06.05.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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