Ding, Jinxue ; Li, Wei ; Thiem, Moritz ; Fan, Wugang ; Zhang, Siyuan ; Teppala, Dharma Teja ; Lu, Kathy ; Ionescu, Emanuel ; Riedel, Ralf ; Weidenkaff, Anke ; Xie, Wenjie (2025)
In-situ polymer-derived SiC/Si(B)OC ceramic nanocomposites: a sustainable potential candidate for high-temperature thermoelectric applications.
In: Chemical Engineering Journal, 503
doi: 10.1016/j.cej.2024.158420
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Polymer-derived ceramics are potential candidates for the next generation of high-temperature thermoelectrics due to their exceptional high-temperature stability and chemical resistance, characteristics that are absent in conventional thermoelectric intermetallic compounds. In this work, we prepared polymer-derived SiC/Si(B)OC ceramic nanocomposites by introducing B4C particles into polysiloxane, followed by high-temperature pyrolysis, and explored their microstructural evolution and thermoelectric properties. The addition of B4C has a catalytic effect on the growth of SiC and the graphitization of carbon, resulting in the establishment of a more efficient conduction network. Consequently, the electrical conductivity at room temperature increases from 81 S m−1 in the sample without B4C to 1103 S m−1 in the sample with the addition of 1 wt% B4C. The introduction of B4C leads to a higher content of the crystalline SiC phase, which in turn contributes to an enhanced Seebeck coefficient. Finally, a remarkable increase in ZT was observed. The highest ZT of 8.9 × 10−4 was achieved in the sample with 1 wt% B4C at 1100 K. Although there is still a considerable distance to cover in achieving suitable ZT values in polymer-derived ceramics, this study provides a straightforward strategy for enhancing electrical transport properties.

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