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High‐Performance Thermoelectricity in Nanostructured Earth‐Abundant Copper Sulfides Bulk Materials
Author(s) -
Ge ZhenHua,
Liu Xiaoye,
Feng Dan,
Lin Jingyang,
He Jiaqing
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201600607
Subject(s) - spark plasma sintering , materials science , ball mill , grain size , thermoelectric effect , thermoelectric materials , copper , nanotechnology , sintering , metallurgy , composite material , thermal conductivity , thermodynamics , physics
Na x Cu 9 S 5 ( 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 Na 0.05 Cu 9 S 5 sample that is nearly threefold higher than that of pristine Cu 9 S 5 and comparable to the modified PbS materials (ZT ≈ 1.2 at 923 K).