High‐Performance Thermoelectricity in Nanostructured Earth‐Abundant Copper Sulfides Bulk Materials

作者：Zhen‐Hua Ge, Xiaoye Liu, Dan Feng, Jingyang Lin, Jiaqing He · 发表于：Advanced Energy Materials · 年份：2016 · DOI：10.1002/aenm.201600607 · 被引用次数：138 · 研究领域：Advanced Thermoelectric Materials and Devices、Thermal properties of materials、Advanced Thermodynamics and Statistical Mechanics

NaxCu9S5 (x = 0, 0.025, 0.05, 0.15, 0.25) nanopowders with an average size of 3 nm are prepared by ball milling and are then sintered with spark plasma. Due to the small size of the nanopowders, the bulk materials possess very fine grains after sintering. The highest ZT value is about 1.1 at 773 K and is obtained for Na0.05Cu9S5 sample that is nearly threefold higher than that of pristine Cu9S5 and comparable to the modified PbS materials (ZT ≈ 1.2 at 923 K).