Macromolecular Research ( IF 2.4 ) Pub Date : 2021-08-24 , DOI: 10.1007/s13233-021-9067-7 Chengbin Yu 1 , Jae Ryoun Youn 1 , Young Seok Song 2
Phase change materials (PCMs) containing graphene nano-platelets (GNPs) were fabricated and utilized for efficient thermo-electric energy harvesting during the phase transition process. A system composed of two different PCMs at opposite positions can absorb or release large amounts of thermal energy while remaining in a nearly isothermal condition. Based on the Seebeck effect, the energy harvesting system generates electrical current from temperature differences. The increase in the thermal conductivity of the PCMs can create isothermal fields and enhance thermoelectric energy conversion efficiency. In this study, two different PCM composites were found to exhibit higher thermal conductivity with increasing the amount of GNPs filler. The thermal conductivity of the two composites clearly increased to 0.5858 W/mK and 0.4974 W/mK, while the heating and cooling thermo-electric conversion efficiencies were also enhanced to 55.59% and 33.33%. Furthermore, the thermo-electric energy profiles were numerically modeled using the finite element method (FEM) to compare with the experimental results.
中文翻译:
使用石墨烯纳米片嵌入相变材料增强热电能量转换
制造含有石墨烯纳米片 (GNP) 的相变材料 (PCM) 并将其用于相变过程中的有效热电能量收集。由位于相反位置的两种不同 PCM 组成的系统可以吸收或释放大量热能,同时保持接近等温状态。基于塞贝克效应,能量收集系统通过温差产生电流。PCM 热导率的增加可以产生等温场并提高热电能量转换效率。在这项研究中,发现两种不同的 PCM 复合材料随着 GNP 填料量的增加表现出更高的热导率。两种复合材料的热导率明显增加到 0.5858 W/mK 和 0.4974 W/mK,同时加热和冷却热电转换效率也分别提高到55.59%和33.33%。此外,使用有限元方法 (FEM) 对热电能量分布进行了数值模拟,以与实验结果进行比较。