rGO/Ag_(0.005)Sn_(0.995)Se热电复合材料的制备及性能研究
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摘要
为了实现石墨烯纳米相在基体中的均匀分散,提高多晶SnSe的热电性能,本文首先利用熔炼法合成了多晶Ag_(0.005)Sn_(0.995)Se材料,然后采用液相沉淀法实现了Ag_(0.005)Sn_(0.995)Se与氧化石墨烯(GO)均匀复合,再经过氢气还原和SPS烧结制备得到rGO/Ag_(0.005)Sn_(0.995)Se复合材料。研究结果表明,复合rGO显著提高了载流子迁移率,电导率由基体的33. 64 S/cm提高到39. 29 S/cm。同时第二相rGO的引入,增加了晶界数量,增强了声子散射,降低了热导率。当复合rGO量为0. 50wt%时,在垂直热压方向上获得了最高的ZT值0. 73(773 K)。
In order to improve the thermoelectric properties of the polycrystalline SnSe by dispersing the graphene nanophase in the matrix uniformly,polycrystalline Ag_(0.005)Sn_(0.995)Se material was synthesized by melting method,then graphene oxide( GO)was uniformly dispersed in the Ag_(0.005)Sn_(0.995)Se matrix via liquid precipitation method,finally the rGO/Ag_(0.005)Sn_(0.995)Se composite material was prepared by hydrogen reduction and SPS. The results show that the addition of rGO can significantly enhance the carrier mobility,so the electrical conductivity increased from 33. 64 S/cm to 39. 39 S/cm. At the same time,the introduction of the second phase rGO increased the number of grain boundaries and enhanced phonon scattering,leading to the reduced thermal conductivity. The highest ZT value of 0. 73( 773 K) was obtained along perpendicular to the pressing direction for 0. 50 wt% rGO/Ag_(0.005)Sn_(0.995)Se composite.
In order to improve the thermoelectric properties of the polycrystalline SnSe by dispersing the graphene nanophase in the matrix uniformly,polycrystalline Ag_(0.005)Sn_(0.995)Se material was synthesized by melting method,then graphene oxide( GO)was uniformly dispersed in the Ag_(0.005)Sn_(0.995)Se matrix via liquid precipitation method,finally the rGO/Ag_(0.005)Sn_(0.995)Se composite material was prepared by hydrogen reduction and SPS. The results show that the addition of rGO can significantly enhance the carrier mobility,so the electrical conductivity increased from 33. 64 S/cm to 39. 39 S/cm. At the same time,the introduction of the second phase rGO increased the number of grain boundaries and enhanced phonon scattering,leading to the reduced thermal conductivity. The highest ZT value of 0. 73( 773 K) was obtained along perpendicular to the pressing direction for 0. 50 wt% rGO/Ag_(0.005)Sn_(0.995)Se composite.
引文
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[2] Bathula S,Jayasimhadri M,Singh N,et al. Enhanced Thermoelectric Figure-of-Merit in Spark Plasma Sintered Nanostructured N-Type Si Ge Alloys[J]. Applied Physics Letters,2012,101(21):634-639.
[3] Zhang J,Xu B,Wang L M,et al. High-Pressure Synthesis of Phonon-Glass Electron-Crystal Featured Thermoelectric Lix Co4Sb12[J]. Acta Materialia,2012,60(3):1246-1251.
[4] Zhao L D,Luo S H,Zhang Y S,et al. Ultralow Thermal Conductivity and High Thermoelectric Figure of Merit in SnSe Crystals[J]. Nature,2014,508(7496):373-390.
[5] Shi W,Gao M,Wei J,et al. Tin Selenide(SnSe):Growth,Properties,and Applications[J]. Advanced Science,2018,5(4):1700602.
[6] Nguyen V Q,Kim J,Cho S. A Review of SnSe:Growth and Thermoelectric Properties[J]. Journal of the Korean Physical Society,2018,72(8):841-857.
[7] Chu F,Zhang Q H,Zhou Z X,et al. Enhanced Thermoelectric and Mechanical Properties of Na-Doped Polycrystalline SnSe Thermoelectric Materials Via CNTs Dispersion[J]. Journal of Alloys and Compounds,2018,741:756-764.
[8] Sassi S,Candolfi C,Vaney J B,et al. Assessment of the Thermoelectric Performance of Polycrystalline P-type SnSe[J]. Applied Physics Letters,2014,104(21):212105.
[9] Chen C L,Wang H,Chen Y Y,et al. Thermoelectric Properties of P-Type Polycrystalline SnSe Doped with Ag[J]. Journal of Materials Chemistry A,2014,2(29):11171-11176.
[10] Xu B,Tian Y J,Cai B W,et al. Sodium Doped Polycrystalline SnSe:High Pressure Synthesis and Thermoelectric Properties[J]. Journal of Alloys&Compounds,2017,727:1014-1019.
[11] Chen Y,Ge Z,Yin M,et al. Understanding of the Extremely Low Thermal Conductivity in High-Performance Polycrystalline SnSe through Potassium Doping[J]. Advanced Functional Materials,2016,26(37):6836-6845.
[12] Zhang Q,Chere E K,Sun J,et al. Studies on Thermoelectric Properties of N-type Polycrystalline SnSe1-xSxby Iodine Doping[J]. Advanced Energy Materials,2015,5(12):1500360.
[13] Li J F,He J Q,Zhao L D,et al. Raising Thermoelectric Performance of N-type SnSe via Br Doping and Pb Alloying[J]. RSC Advances,2016,6:98216-98220.
[14] Xue W,Xu J,Liu G,et al. Optimization of Thermoelectric Properties in N-type SnSe Doped with BiCl3[J]. Applied Physics Letters,2016,108(8):083902.
[15] Yang S D,Nutor R K,Chen Z J,et al. Influence of Sodium Chloride Doping on Thermoelectric Properties of P-type SnSe[J]. Journal of Electronic Materials,2017,46(11):6662-6668.
[16] Tang G D,Zhang J,Gong Y R,et al. Extremely Low Thermal Conductivity and Enhanced Thermoelectric Performance of Polycrystalline SnSe by Cu Doping[J]. Scripta Materialia,2018,147:74-78.