KMS Chongqing Institute of Green and Intelligent Technology, CAS
Facile: In situ solution synthesis of SnSe/rGO nanocomposites with enhanced thermoelectric performance | |
Huang, Lisi1; Lu, Jianzhang1; Ma, Duowen1; Ma, Chunmiao1; Zhang, Bin3; Wang, Hengyang1; Wang, Guoyu5; Gregory, Duncan H.6; Zhou, Xiaoyuan3,4; Han, Guang1,2 | |
2020 | |
摘要 | Constructing nanostructured composite architectures has been considered as an effective strategy to reduce the lattice thermal conductivity (κL) and enhance the dimensionless figure of merit (ZT) of thermoelectric materials. Herein, a series of SnSe/reduced graphene oxide (rGO)-x (x = 0.1, 0.3, 0.5, 0.7 wt%) nanocomposites are controllably synthesised in situ via a facile single-step bottom-up solution method, where rGO nanosheets are incorporated intimately into the SnSe matrix. Nanocompositing performs two key functions: (i) significantly reducing the lattice thermal conductivity of the material, which can be attributed to enhanced phonon scattering from high-density SnSe/rGO interfaces, and (ii) improving the electrical conductivity over the low temperature range, as result of an increased carrier concentration. The subsequent thermoelectric performance of SnSe/rGO sintered pellets has been optimised by tuning the rGO mass fraction, with SnSe/rGO-0.3 achieving κL = 0.36 W m-1 K-1 at 773 K (cutting the κL of SnSe by 33%) to yield a maximum ZT of 0.91 at 823 K (representing a ∼47% increase compared to SnSe). This study provides a new pathway to improve the thermoelectric performance of polycrystalline SnSe by way of engineering metal chalcogenide/rGO composite architectures at the nanoscale. © 2019 The Royal Society of Chemistry. |
DOI | 10.1039/c9ta11737g |
发表期刊 | Journal of Materials Chemistry A |
ISSN | 20507488 |
卷号 | 8期号:3页码:1394-1402 |
收录类别 | EI |
语种 | 英语 |
EISSN | 20507496 |