Metallic 1T phase MoS2 nanosheets for high-performance thermoelectric energy harvesting
Metallic 1T phase MoS2 nanosheets for high-performance thermoelectric energy harvesting
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DOI：
10.1016/j.nanoen.2016.05.022
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发表时间：
2016-08-01
期刊：
影响因子：
17.6
通讯作者：
Carroll, David L.
中科院分区：
文献类型：
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作者：
Huang, Huihui;Cui, Yue;Carroll, David L.
利用余热发电的热电材料将在全球可持续能源解决方案中发挥重要作用。低维材料由于其独特的具有受限电子和空穴的态密度，为高性能热电性能开辟了新的途径。在这里，我们报道了相工程的二维过渡金属二硫族化合物代表了一类新的高性能热电材料。含有高浓度金属1T相MoS2的有机锂化学剥离MoS2纳米片表现出优异的热电性能，其室温功率因数为73.1 μ W m(-1) K-2，远高于原始石墨烯或单壁碳纳米管。我们对单层1T相MoS2的第一原理计算提供了其金属和空穴导电性的物理见解，这恰好是其有利的热电性能的重要来源。这些金属1T相MoS2纳米片还显示出有趣的湿敏热电特性，表明它们不仅可以作为热电能量收集装置，还可以作为自供电气体传感器。(C) 2016 Elsevier Ltd.版权所有。
Thermoelectric materials that can generate electricity from waste heat will play an important role in the global sustainable energy solution. Low dimensional materials open new routes to high performance thermoelectric properties due to their unique density of states with confined electrons and holes. Here, we report that the phase engineered two dimensional transition metal dichalcogenides represent a new class of high performance thermoelectric materials. The organolithium chemically exfoliated nanosheets of MoS2 containing a high concentration of metallic 1T phase MoS2 show superior thermoelectric properties, with a room temperature power factor of 73.1 mu W m(-1) K-2, which is much higher than the pristine graphene or single wall carbon nanotubes can yield. Our first principle calculations on mono layer 1T phase MoS2 provide physical insight of their metallic and hole conductive nature, which happens to be important origins of their advantageous thermoelectric properties. These metallic 1T phase MoS2 nanosheets also reveal interesting moisture sensitive thermoelectric properties, indicating their potential diverse applications not only as thermoelectric energy harvesting devices but also as self powered gas sensors. (C) 2016 Elsevier Ltd. All rights reserved.