Li Yanan, Wu Ping, Ma Shuai, Zhang Mingdi, Pei Yili
College of Science, North China University of Technology Beijing 100144 China.
School of Mathematics and Physics, University of Science and Technology Beijing Beijing 100083 China
RSC Adv. 2025 Aug 20;15(36):29404-29413. doi: 10.1039/d5ra04876a. eCollection 2025 Aug 18.
Composite nanomaterial is a scientific solution to modulating the properties of thermoelectric materials. The thermoelectric properties of CaCoO ceramic that remain stable in high-temperature air are relatively low, and how to decouple the relationship between heat and electricity is the focus of the research. This study systematically investigates the thermoelectric transport properties of composite CaCoO@ZnO materials. The samples do not undergo additional chemical reactions and exhibit lamellar microstructures. At temperatures up to 825 K, the thermal conductivity of pure CaCoO was determined to be 2.58 W m K, whereas that of the CaCoO@0.7ZnO was significantly reduced to 1.94 W m K, a reduction of about 25%. Based on the effective medium theory analysis, adding ZnO in CaCoO introduces interfacial thermal resistance and porosity, which is key in reducing thermal conductivity. Adding ZnO promotes the electrical conductivity enhancement of CaCoO with a minor reduction in the Seebeck coefficient. Under the coordinated regulation of electrical and thermal properties, the of CaCoO@0.7ZnO is enhanced by about 75% compared with that of pure CaCoO.
复合纳米材料是调控热电材料性能的一种科学解决方案。在高温空气中保持稳定的CaCoO陶瓷的热电性能相对较低，如何解耦热与电之间的关系是研究的重点。本研究系统地研究了复合CaCoO@ZnO材料的热电输运性能。样品未发生额外的化学反应，并呈现出层状微观结构。在高达825 K的温度下，纯CaCoO的热导率测定为2.58 W m K，而CaCoO@0.7ZnO的热导率显著降低至1.94 W m K，降低了约25%。基于有效介质理论分析，在CaCoO中添加ZnO会引入界面热阻和孔隙率，这是降低热导率的关键。添加ZnO促进了CaCoO的电导率增强，同时塞贝克系数略有降低。在电性能和热性能的协同调控下，CaCoO@0.7ZnO的 比纯CaCoO提高了约75%。 （原文此处“the of CaCoO@0.7ZnO”表述不完整，推测可能是某个性能指标未完整给出）
