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| 1 | High thermoelectric figure of merit ZT>1 in SnS polycrystals显示文摘Eco-friendly tin sulfide(SnS)has attracted increasing attention in the thermoelectric community because of its elemental abundance and analogous crystal structure to SnSe as a new thermoelectric material.However,so far no high dimensionless thermoelectric figure of merit ZT>1 was reported in SnS polycrystals.This work found an effective strategy for enhancing the thermoelectric performance of ptype polycrystalline SnS by Ag doping and vacancy engineering,leading to three orders of magnitude increase in carrier concentration and optimized effective mass and carrier mobility.As a result of the enhanced electrical conductivity,three times higher power factor ~3.85 μW/cm K^(2) at 877 K is realized in Sn_(0.995)Ag_(0.005)S sample.Interestingly,nanostructuring with Ag nano-precipitates were formed in the Agdoped SnS sample.Moreover,with introducing Sn vacancies in the crystal structure of Sn_(0.995-vac)Ag_(0.005)S,the power factor further enhanced to~4.25 μW/cm K^(2).In addition to the low-frequency phonons scattering by Ag nano-precipitates,dislocations strengthens the scattering of mid-frequency phonon,leading to an ultralow lattice thermal conductivity <0.5 W/m K above 800 K and a record high ZT up to 1.1 at 877 K in Sn_(0.99)Ag_(0.005)S polycrystals. | Asfandiyar Bowen Cai Li-Dong Zhao Jing-Feng Li | 2020 | Journal of Materiomics2020，6，1： | 4 |
| 2 | Ni掺杂提高Cu_(12)Sb_4S_(13-δ)黝铜矿热电性能(英文)显示文摘Cu_(12)Sb_4S_(13)是一种储量丰富、环境友好的天然矿物,被热电领域普遍关注.本研究旨在揭示Ni掺杂提高黝铜矿材料热电性能的机理.采用机械合金化(MA)结合放电等离子体烧结(SPS)的方法制备出Cu_(12-x)Ni_xSb_4S_(13-δ)(x=0.5,0.7,1.0,1.5,2.0)样品.实验结果表明,在测量温度范围内(323–723 K),随着Ni含量的增加,样品的热导率急剧下降(<0.9 W m^(-1)K^(-1)),同时热电功率因子逐渐增加.理论模型计算表明,晶格热导率的降低主要来源于Ni掺杂引起的析出相及位错对中频声子的强散射作用.由于较低的热导率和较高的功率因子,Cu_(11)NiSb_4S_(13-δ)样品在723 K时获得最高ZT值0.95,相对于未掺杂样品,其热电性能提高了46%.同时,热循环测试表明,通过Ni掺杂提高了黝铜矿热电材料的化学稳定性. | 孙富华 董金峰 Shaugath Dey AsfANDiyar 吴超峰 潘瑜 唐怀超 李敬锋 | 2018 | Science China Materials2018，61，9： | 2 |
| 3 | 湿化学方法掺杂Na对多晶SnS热电性能的影响(英文)显示文摘SnS作为一种与SnSe特征结构相似且元素丰度更高的热电材料,受到越来越多的关注,但是其较低的本征载流子浓度限制了热电性能的提升.本工作利用了一种改进的化学共沉淀方法调节基体中Na+含量来提高载流子浓度,进而提升了多晶SnS的热电性能.最大功率因子在873K达到362μWm^-1K^-2,高于目前关于多晶SnS的最高报道值.得益于提升的电输运性能以及较低的热导率, ZT值在873K达到0.52 .该工作为其他热电化合物的掺杂改性技术提供了新思路. | 唐怀超 董金峰 孙富华 Asfandiyar 尚鹏鹏 李敬锋 | 2019 | Science China Materials2019，62，7： | 2 |
| 4 | Review:Phonon Engineering in Thermoelectric Materials显示文摘One of the abundantly available energies that could be found in industrial power plants, running vehicles, nuclear power stations, etc. is known as thermal energy. A physical phenomenon known as thermoelectricity converts thermal energy into electrical energy and vice versa, providing a green route for power generation and a potential solution to the world energy crisis. The thermoelectric conversion efficiency is generally characterized by the temperature-dependent dimensionless figure of merit(zT), which is generally promoted by increasing the power factor and reducing the thermal conductivity. The present work reviews heat transmission in thermoelectric materials, particularly phonon engineering to reduce the lattice thermal conductivity. The two leading strategies of point defects engineering and nanostructuring for reducing thermal conductivity have been summarized. The optimized reported zTs of various thermoelectric materials in terms of reduced thermal conductivity have been presented. | Asfandiyar Sichen Duan Jun Mao Qian Zhang | 2022 | Journal of Harbin Institute of Technology(New Series)2022，29，6： | 0 |
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