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Featured researches published by Shanyu Wang.


Nano Letters | 2010

Identifying the Specific Nanostructures Responsible for the High Thermoelectric Performance of (Bi,Sb)2Te3 Nanocomposites

Wenjie Xie; Jian He; Hye Jung Kang; Xinfeng Tang; Song Zhu; Mark Laver; Shanyu Wang; J. R. D. Copley; Craig M. Brown; Qingjie Zhang; Terry M. Tritt

Herein, we report the synthesis of multiscale nanostructured p-type (Bi,Sb)(2)Te(3) bulk materials by melt-spinning single elements of Bi, Sb, and Te followed by a spark plasma sintering process. The samples that were most optimized with the resulting composition (Bi(0.48)Sb(1.52)Te(3)) and specific nanostructures showed an increase of approximately 50% or more in the figure of merit, ZT, over that of the commercial bulk material between 280 and 475 K, making it suitable for commercial applications related to both power generation and refrigeration. The results of high-resolution electron microscopy and small angle and inelastic neutron scattering along with corresponding thermoelectric property measurements corroborate that the 10-20 nm nanocrystalline domains with coherent boundaries are the key constituent that accounts for the resulting exceptionally low lattice thermal conductivity and significant improvement of ZT.


Journal of Materials Science | 2013

High performance Bi2Te3 nanocomposites prepared by single-element-melt-spinning spark-plasma sintering

Wenjie Xie; Shanyu Wang; Song Zhu; Jian He; Xinfeng Tang; Qingjie Zhang; Terry M. Tritt

The last decade has witnessed nanocomposites becoming a new paradigm in the field of thermoelectric (TE) research. At its core is to prepare high performance TE nanocomposites, both p- and n-type, in a time and energy efficient way. To this end, we in this article summarize our recent effort and results on both p- and n-type Bi2Te3-based nanocomposites prepared by a unique single-element-melt-spinning spark-plasma sintering procedure. The results of transport measurements, scanning and transmission electronic microscopy, and small angle neutron scattering have proved essential in order to establish the correlation between the nanostructures and the TE performance of the materials. Interestingly, we find that in situ formed nanocrystals with coherent boundaries are the key nanostructures responsible for the significantly improved TE performance of p-type Bi2Te3 nanocomposites whereas similar nanostructures turn out to be less effective for n-type Bi2Te3 nanocomposites. We also discuss the alternative strategies to further improve the TE performance of n-type Bi2Te3 materials via nanostructuring processes.


Journal of Materials Chemistry | 2013

Rapid preparation of CeFe4Sb12 skutterudite by melt spinning: rich nanostructures and high thermoelectric performance

Gangjian Tan; Wei Liu; Shanyu Wang; Yonggao Yan; Han Li; Xinfeng Tang; Ctirad Uher

In this work, we adopt a non-equilibrium melt spinning technique combined with a subsequent spark plasma sintering technique to successfully synthesize a p-type nanostructured CeFe4Sb12 skutterudite compound with high homogeneity in less than 24 hours. Microstructures of the melt-spun ribbons and the sintered bulk material are systematically investigated. The evolution of multiple-phase melt-spun ribbons into a single-phase skutterudite compound during the heating process is also carefully examined. Greatly refined matrix grains (300–500 nm) and numerous FeSb2 nanodots with sizes below 50 nm are evenly distributed inside the grains, and together contribute to the experimentally observed low lattice thermal conductivity of the sintered bulk material. Both absolute and average ZT values of this melt-spun skutterudite are about 10% higher than in the material of the same composition prepared by traditional melting and long-term annealing. The markedly shortened preparation time coupled with the enhanced thermoelectric performance should make this synthesis process of interest for commercial applications.


Journal of Materials Chemistry | 2012

The realization of a high thermoelectric figure of merit in Ge-substituted β-Zn4Sb3 through band structure modification

Shanyu Wang; X. J. Tan; Gangjian Tan; Wei Liu; Han Li; Huijun Liu; Xinfeng Tang

In this study, we demonstrate a realization of a favorable modification of band structures and an apparent increase in the density of state effective mass in β-Zn4Sb3 compound by introduction of a slight amount of Ge at the Zn site, in a manner of adding a shape peak below the valence band edge and giving rise to a significant enhancement in the power factor which is similar to the case of Tl-doped PbTe. As a consequence, the high power factor exceeding 1.4 mW m−1 K−2, coupled with the intrinsic very low thermal conductivity originated from complex crystal structures and a high degree of disorder, results in a maximum figure of merit of ∼1.35 at 680 K for the 0.25 at% Ge-substituted sample, which is ∼20% improvement as compared with that of the unsubstituted sample in this study. What is most important is the average ZT between 300 and 680 K reaches ∼1.0, which is ∼35% enhancement in comparison with the unsubstituted sample and superior to most of p-type materials in this temperature range. Furthermore, the combination of high thermoelectric performance and improvement in the thermodynamic properties makes this natural-abundant, “non-toxic” and cheap Ge-substituted β-Zn4Sb3 compound a very promising candidate for thermoelectric energy applications.


Journal of Physics D | 2014

Thermoelectric transport properties of p-type silver-doped PbS with in situ Ag2S nanoprecipitates

Yun Zheng; Shanyu Wang; Wei Liu; Zhongjie Yin; Han Li; Xinfeng Tang; Ctirad Uher

In this study, a series of p-type Ag-doped PbS compounds were prepared by a vacuum melting combined with subsequent spark plasma sintering process. Ag partially occupies Pb sites acting as an electron acceptor to increase the hole concentration, and also in situ forms Ag2S nanoprecipitates at the grain boundaries which are detectable in thermal analysis and microstructural observations. The two existences of Ag both exert significant influences on the electrical transport properties. With increasing temperature, dissolution of Ag2S nanoprecipitates into the PbS matrix as interstitial Ag gradually decreases the hole concentration. Very low mobility of Ag-doped samples is unexpected at low temperatures, which indicates a strong carrier scattering. From temperature dependent mobility, it can be concluded that neutral impurity scattering (μ ~ Ta, a = 0) dominates at low temperature (T 1.5) governs until lattice vibrations take over at T > 450 K (a ~ −2.5). The complex scattering mechanisms at T < 450 K in Ag-doped samples should be originated from the multiple existences of Ag (Ag+, interstitial Ag, Ag2S nanoprecipitates). In particular, Ag doping increases the high temperature electrical conductivity, giving rise to an enhanced power factor of ~0.8 × 10−3 W m−1 K−2 at 870 K for the 1.5 at% Ag-doped sample. Benefiting from the improved power factor and low lattice thermal conductivity originating from strong lattice anharmonicity, a doubled ZT value of ~0.6 can be achieved for Pb0.985Ag0.015S in comparison to that of pristine PbS.


Intermetallics | 2011

Enhanced performances of melt spun Bi2(Te,Se)3 for n-type thermoelectric legs

Shanyu Wang; Wenjie Xie; Han Li; Xinfeng Tang


Acta Materialia | 2010

Simultaneously optimizing the independent thermoelectric properties in (Ti,Zr,Hf)(Co,Ni)Sb alloy by in situ forming InSb nanoinclusions

Wenjie Xie; Jian He; Song Zhu; Xianli Su; Shanyu Wang; Tim Holgate; J.W. Graff; V. Ponnambalam; S.J. Poon; Xinfeng Tang; Qingjie Zhang; Terry M. Tritt


Journal of Physics D | 2010

High performance n-type (Bi,Sb)2(Te,Se)3 for low temperature thermoelectric generator

Shanyu Wang; Wenjie Xie; Han Li; Xinfeng Tang


Acta Materialia | 2011

Enhancement of the thermoelectric performance of β-Zn4Sb3 by in situ nanostructures and minute Cd-doping

Shanyu Wang; Han Li; Dekui Qi; Wenjie Xie; Xinfeng Tang


Acta Materialia | 2013

Realization of high thermoelectric performance in p-type unfilled ternary skutterudites FeSb2+xTe1−x via band structure modification and significant point defect scattering

Gangjian Tan; Wei Liu; Hang Chi; Xianli Su; Shanyu Wang; Yonggao Yan; Xinfeng Tang; Winnie Wong-Ng; Ctirad Uher

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Xinfeng Tang

Wuhan University of Technology

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Han Li

Wuhan University of Technology

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Wenjie Xie

Wuhan University of Technology

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Yonggao Yan

Wuhan University of Technology

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Gangjian Tan

Northwestern University

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Qingjie Zhang

Wuhan University of Technology

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Ctirad Uher

University of Michigan

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Wei Liu

Wuhan University of Technology

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X. F. Tang

Wuhan University of Technology

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