Cai Jingming, Yuan Yujin, Xi Xiang, Ukrainczyk Neven, Pan Lin, Wang Yifeng, Pan Jinlong
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, 211102, China.
College of Mechanics and Materials, Hohai University, Nanjing, 211100, China.
Small. 2024 Feb;20(5):e2305360. doi: 10.1002/smll.202305360. Epub 2023 Oct 2.
Thermoelectric (TE) building materials have the potential to revolutionize sustainable architecture by converting temperature differences into electrical energy. This study introduces geopolymeric TE materials enhanced with manganese dioxide (MnO ) as a modifying agent. Calorimetric experiments examine the impact of MnO on geopolymerization. Mechanical tests show that adding MnO (up to 5% by weight) improves the geopolymer composite's strength, achieving a peak compressive strength of 36.8 MPa. The Seebeck effect of the MnO -modified geopolymeric composite is also studied. The inclusion of MnO boosts the Seebeck coefficient of the geopolymer, reaching a notable 4273 µV C at a 5% MnO dosage. This enhancement is attributed to an increase in the density of states (DOS) and a reduction in relaxation time. However, excessive MnO or high alkali levels may adversely affect the Seebeck coefficient by lengthening the relaxation time.
热电（TE）建筑材料有潜力通过将温度差转化为电能来彻底改变可持续建筑。本研究介绍了用二氧化锰（MnO₂）作为改性剂增强的地质聚合物TE材料。量热实验研究了MnO₂对地质聚合反应的影响。力学测试表明，添加MnO₂（重量比高达5%）可提高地质聚合物复合材料的强度，峰值抗压强度达到36.8 MPa。还研究了MnO₂改性地质聚合物复合材料的塞贝克效应。加入MnO₂提高了地质聚合物的塞贝克系数，在MnO₂用量为5%时达到显著的4273 μV/°C。这种增强归因于态密度（DOS）的增加和弛豫时间的减少。然而，过量的MnO₂或高碱含量可能会通过延长弛豫时间对塞贝克系数产生不利影响。
