Enhanced thermoelectric properties of p-type CoSb3/graphene nanocomposite
Enhanced thermoelectric properties of p-type CoSb3/graphene nanocomposite
复制标题
p型CoSb3/石墨烯纳米复合材料的增强热电性能
DOI：
10.1039/c3ta13202a
复制
发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Zhao, Xinbing
中科院分区：
文献类型：
--
作者：
Feng, Bin;Xie, Jian;Zhao, Xinbing
纳米结构化和第二相结合被认为是提高块体材料热电性能的有前途的方法。在这里，提出了一种设计原理，它结合了这两种方法，用于改善p型CoSb 3的热电性能，通过制造CoSb 3/石墨烯（CoSb 3/G）纳米复合材料，其中第二相，石墨烯，通过原位一锅溶剂热路线引入纳米结构的CoSb 3矩阵。此外，将溶剂热法合成的CoSb 3/G粉末进行热压处理，制备了CoSb 3/G块体材料。结果发现，添加少量的石墨烯可以大大提高导电性，由于载流子浓度和迁移率的增加。此外，石墨烯在纳米结构的CoSb 3基质中的良好分散也有助于低晶格热导率。CoSb 3/G纳米复合材料在800 K下的无量纲优值ZT = 0.61，比无石墨烯的CoSb 3（ZT 0.26）提高了约130%。
Nanostructuring and second phase incorporation are considered to be promising ways of enhancing the thermoelectric performance of bulk materials. Here, a design principle is proposed which combines these two methods for improving the thermoelectric performance of p-type CoSb3 by fabricating a CoSb3/graphene (CoSb3/G) nanocomposite, where a second phase, graphene, is introduced in the nanostructured CoSb3 matrix via an in situ one-pot solvothermal route. In addition, CoSb3/G bulk materials were prepared by hot pressing the solvothermally synthesized CoSb3/G powder. It was found that addition of a small amount of graphene can drastically enhance the electrical conductivity due to the increase in both carrier concentration and mobility. In addition, the well dispersed graphene in the nanostructured CoSb3 matrix also contributes to the low lattice thermal conductivity. A dimensionless figure of merit ZT = 0.61 at 800 K has been obtained for the CoSb3/G nanocomposite, which is about a 130% improvement over that of graphene-free CoSb3 (∼0.26).