Synergistic enhancement of power factor and figure-of-merit in tin sulfide-expanded graphite cementitious composites by silica fume and fly ash

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-06-28 DOI:10.1016/j.mseb.2025.118567

Lei Hao, Jiamin Wang, Lihang Sheng, Qian Zhang, Jian Wei, Hao Zhang, Xueting Li

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引用次数: 0

Abstract

Thermoelectric materials, which enable the direct conversion of heat energy into electricity, have broad applications in waste heat recovery, low-energy snow and ice melting, urban heat island mitigation, and renewable energy systems. However, conventional thermoelectric materials, such as PbTe and Bi₂Te₃, fly ashce limitations due to their high cost, scarcity, and potential toxicity. Utilizing solid waste materials to enhance the performance of thermoelectric materials offers a dual benefit: reducing production costs and promoting the resourceful utilization of waste. Currently, the thermoelectric properties of cementitious composites are primarily constrained by their high carbon content, low Seebeck coefficients, and poor electrical conductivity.

In this study, for the first time, two solid waste materials-silica fume (SF) and fly ash (FA) were incorporated into tin sulfide (SnS) carbon fiber (CF) expanded graphite (EG) cementitious composites to improve their thermoelectric performance. This was achieved by modifying the interface defects and matrix porosity, thereby enhancing both the thermoelectric and mechanical properties of the composites. For instance, the addition.

of 2.0 wt% fly ash resulted in a conductivity of 2.17 S/cm, a Seebeck coefficient of 33.75 μV/°C, and a power factor (PF) of 0.2 μW·m⁻¹·K⁻², representing a 2.8-fold increase in the power factor. Similarly, the incorporation of 4.0 wt% silica fume yielded a conductivity of 4.68 S/cm, a Seebeck coefficient of 30.71 μV/°C, a power factor of 0.42 μW·m⁻¹·K⁻², and a ZT value of 2.4 × 10^-5, corresponding to a 6-fold increase in the power factor and a 4.8 fold increase in the ZT value. This research demonstrates a novel approach to leveraging solid waste materials for enhancing the thermoelectric properties of cementitious composites. It not only advances the development of green material technologies but also provides innovative solutions for addressing urban energy and environmental challenges.

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硅灰和粉煤灰协同增强硫化锡膨胀石墨胶凝复合材料的功率因数和性能系数

热电材料能够将热能直接转化为电能，在余热回收、低能耗冰雪融化、城市热岛缓解和可再生能源系统等方面有着广泛的应用。然而，传统的热电材料，如PbTe和Bi2Te3，由于其高成本，稀缺性和潜在的毒性而受到限制。利用固体废物来提高热电材料的性能具有双重效益：降低生产成本和促进废物的资源化利用。目前，胶凝复合材料的热电性能主要受到其含碳量高、塞贝克系数低和导电性差的限制。本研究首次将硅灰（SF）和粉煤灰（FA）两种固体废弃物掺入硫化锡（sn）碳纤维（CF）膨胀石墨（EG）胶凝复合材料中，以改善其热电性能。这是通过改变界面缺陷和基体孔隙度来实现的，从而提高了复合材料的热电性能和机械性能。例如，加法。添加2.0 wt%粉煤灰后，电导率为2.17 S/cm， Seebeck系数为33.75 μV/°C，功率因数（PF）为0.2 μW·m−1·K−2，功率因数提高2.8倍。同样，加入4.0 wt%的硅粉，电导率为4.68 S/cm，塞贝克系数为30.71 μV/°C，功率因数为0.42 μW·m−1·K−2，ZT值为2.4 × 10-5，对应于功率因数增加6倍，ZT值增加4.8倍。本研究展示了一种利用固体废物增强胶凝复合材料热电性能的新方法。它不仅推动了绿色材料技术的发展，而且为应对城市能源和环境挑战提供了创新的解决方案。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.