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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
2020-01-21
摘要Constructing nanostructured composite architectures has been considered as an effective strategy to reduce the lattice thermal conductivity (kappa(L)) 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 kappa(L) = 0.36 W m(-1) K-1 at 773 K (cutting the kappa(L) of SnSe by 33%) to yield a maximum ZT of 0.91 at 823 K (representing a similar to 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.
DOI10.1039/c9ta11737g
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
卷号8期号:3页码:1394-1402
通讯作者Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn) ; Han, Guang(guang.han@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000508855700048
语种英语