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Nanostructured SnSe integrated with Se quantum dots with ultrahigh power factor and thermoelectric performance from magnetic field-assisted hydrothermal synthesis†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-06-03 00:00:00 , DOI: 10.1039/c9ta03967h Rui Xu 1, 2, 3, 4, 5 , Lulu Huang 5, 6, 7, 8, 9 , Jian Zhang 5, 6, 7, 8, 9 , Di Li 5, 6, 7, 8, 9 , Jizi Liu 2, 3, 5, 10 , Jiang Liu 1, 2, 3, 4, 5 , Jun Fang 5, 9, 11, 12 , Meiyu Wang 13, 14, 15, 16, 17 , Guodong Tang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-06-03 00:00:00 , DOI: 10.1039/c9ta03967h Rui Xu 1, 2, 3, 4, 5 , Lulu Huang 5, 6, 7, 8, 9 , Jian Zhang 5, 6, 7, 8, 9 , Di Li 5, 6, 7, 8, 9 , Jizi Liu 2, 3, 5, 10 , Jiang Liu 1, 2, 3, 4, 5 , Jun Fang 5, 9, 11, 12 , Meiyu Wang 13, 14, 15, 16, 17 , Guodong Tang 1, 2, 3, 4, 5
Affiliation
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Thermoelectric materials that can directly convert thermal energy into electrical energy have great potential in solving the present energy crisis. SnSe has emerged as one of the most intriguing new thermoelectric materials since the discovery of the excellent thermoelectric properties of its single crystals. Here, we develop a new solution synthesized method (in situ magnetic field-assisted hydrothermal synthesis) for achieving new nanostructured SnSe integrated with Se quantum dots. The critical nucleation energy reduces and the nucleation rate increases during the hydrothermal synthesis process as a high magnetic field is applied, which leads to the presence of the homogeneous distribution of Se quantum dots and smaller nano grains. Enhanced density of states and the energy filtering effect contribute towards a significant enhancement in the Seebeck coefficient and power factor (PF) due to the Se quantum dots and smaller nano grains. The enhanced density of states was directly identified by ultraviolet photoelectron spectroscopic measurements. With the aid of a high magnetic field in solution chemistry, these materials maintain low thermal conductivity due to the Se quantum dots, smaller nano grains and nanoprecipitates. Benefiting from the enhanced power factor and reduced thermal conductivity, a high figure of merit (ZT) of ∼2.0 at 873 K was achieved in a Se quantum dot/Sn0.99Pb0.01Se nanocomposite. This work paves the way for the design of prospective thermoelectric materials by applying an external high magnetic field.
中文翻译：
纳米结构SnSe与Se量子点集成在一起，具有超高功率因数和磁场辅助水热合成的热电性能†
可直接将热能转换成电能的热电材料在解决当前的能源危机方面具有巨大的潜力。自从发现单晶的出色热电性能以来，SnSe已经成为最吸引人的新型热电材料之一。在这里，我们开发了一种新的溶液合成方法（原位磁场辅助水热合成），以实现集成有Se量子点的新型纳米结构SnSe。当施加高磁场时，在水热合成过程中，临界成核能降低，成核速率增加，这导致了Se量子点和较小纳米颗粒的均匀分布。由于硒量子点和较小的纳米晶粒，增强的状态密度和能量过滤效果有助于显着提高塞贝克系数和功率因数（PF）。增强的状态密度通过紫外光电子能谱测量直接确定。借助溶液化学中的高磁场，这些材料由于Se量子点而保持较低的热导率，较小的纳米颗粒和纳米沉淀。得益于增强的功率因数和降低的热导率，高品质因数（在Se量子点/ Sn 0.99 Pb 0.01 Se纳米复合材料中，在873 K时达到约2.0的ZT）。这项工作通过施加外部强磁场为预期的热电材料的设计铺平了道路。
更新日期：2019-06-03
中文翻译：
纳米结构SnSe与Se量子点集成在一起，具有超高功率因数和磁场辅助水热合成的热电性能†
可直接将热能转换成电能的热电材料在解决当前的能源危机方面具有巨大的潜力。自从发现单晶的出色热电性能以来，SnSe已经成为最吸引人的新型热电材料之一。在这里，我们开发了一种新的溶液合成方法（原位磁场辅助水热合成），以实现集成有Se量子点的新型纳米结构SnSe。当施加高磁场时，在水热合成过程中，临界成核能降低，成核速率增加，这导致了Se量子点和较小纳米颗粒的均匀分布。由于硒量子点和较小的纳米晶粒，增强的状态密度和能量过滤效果有助于显着提高塞贝克系数和功率因数（PF）。增强的状态密度通过紫外光电子能谱测量直接确定。借助溶液化学中的高磁场，这些材料由于Se量子点而保持较低的热导率，较小的纳米颗粒和纳米沉淀。得益于增强的功率因数和降低的热导率，高品质因数（在Se量子点/ Sn 0.99 Pb 0.01 Se纳米复合材料中，在873 K时达到约2.0的ZT）。这项工作通过施加外部强磁场为预期的热电材料的设计铺平了道路。
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