Having a high thermoelectric figure of merit is the essential prerequisites of a thermoelectric generator. In this study, a novel way to achieve a record high figure of merit for cement composites using graphene and metallic oxide nanoparticle inclusions is developed. This paper investigated the thermoelectric performances of graphene-metallic oxide cement composites fabricated by special dry mixing and pressing, followed by curing at ambient conditions. The experimental results indicate that the incorporation of oxide nanoparticles increases the Seebeck coefficient of the composites to 100 μV/K, which is factor ~3 higher than that of graphene based cement composites reported in our previous study. Improved Seebeck coefficient would effectively enhance the thermoelectric figure of merit. A maximum figure of merit as 1.01 × 10⁻² at 70 °C is obtained in this work, which is an order of magnitude higher than the other prior reported cement composites. The research findings provide an effective strategy to functionalize the cement based thermoelectric devices for the potential application in energy harvesting of smart buildings.

具有高的热电品质因数是热电发电机的基本前提。在这项研究中，开发了一种使用石墨烯和金属氧化物纳米颗粒夹杂物实现水泥复合材料创纪录高品质的新方法。本文研究了通过特殊的干混和压制，然后在环境条件下固化，制备的石墨烯-金属氧化物水泥复合材料的热电性能。实验结果表明，氧化物纳米颗粒的掺入将复合材料的塞贝克系数提高到100μV/ K，比我们先前研究中报道的石墨烯基水泥复合材料的塞贝克系数高3倍。改善的塞贝克系数将有效地提高热电性能。最高品质因数为1.01×10在这项工作中获得了在70°C下的^-2，比其他先前报道的水泥复合材料高一个数量级。研究结果为将水泥基热电设备功能化提供了一种有效的策略，可将其潜在地应用于智能建筑的能量收集。