Zhou Hongyu, Liu Huang, Qian Guoping, Xu Peng, Yu Huanan, Cai Jun, Zheng Jianlong
National Engineering Laboratory for Highway Maintenance Technology, School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Nanomaterials (Basel). 2022 Nov 3;12(21):3883. doi: 10.3390/nano12213883.
Driven by the huge thermal energy in cement concrete pavements, thermoelectric (TE) cement has attracted considerable attention. However, the current TE cement shows poor performance, which greatly limits its application. Herein, a series of BiSbTe/carbon nanotubes (CNTs) co-reinforced cement composites have been prepared, and their TE properties were systematically investigated. It was shown that the addition of BiSbTe particles can effectively improve the TE properties of CNTs-reinforced cement composites by building a better conductive network, increasing energy filtering and interfaces scattering. The BiSbTe/CNTs cement composites with 0.6 vol.% of BiSbTe exhibits the highest ZT value of 1.2 × 10, increased by 842 times compared to that of the CNTs-reinforced cement composites without BiSbTe. The power output of this sample with the size of 2.5 × 3.5 × 12 mm reaches 0.002 μW at a temperature difference of 19.1 K. These findings shed new light on the development of high-performance TE cement, which can guide continued advances in their potential application of harvesting thermal energy from pavements.
在水泥混凝土路面巨大热能的驱动下，热电（TE）水泥受到了广泛关注。然而，目前的TE水泥性能较差，这极大地限制了其应用。在此，制备了一系列BiSbTe/碳纳米管（CNTs）共增强水泥复合材料，并对其热电性能进行了系统研究。结果表明，添加BiSbTe颗粒可以通过构建更好的导电网络、增加能量过滤和界面散射来有效改善CNTs增强水泥复合材料的热电性能。BiSbTe体积分数为0.6%的BiSbTe/CNTs水泥复合材料表现出最高的ZT值1.2×10，与不含BiSbTe的CNTs增强水泥复合材料相比提高了842倍。尺寸为2.5×3.5×12 mm的该样品在19.1 K的温差下功率输出达到0.002 μW。这些发现为高性能TE水泥的开发提供了新的思路，可指导其在从路面收集热能潜在应用方面的持续进展。
