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Enhanced Thermoelectric Performance of Separately Ni ‐Doped and Ni / Sr ‐Codoped LaCoO 3 Nanocomposites
Author(s) -
Li Fu,
Li JingFeng
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05332.x
Subject(s) - seebeck coefficient , materials science , electrical resistivity and conductivity , doping , sintering , thermoelectric effect , analytical chemistry (journal) , calcination , thermal conductivity , conductivity , chemical engineering , mineralogy , chemistry , composite material , chromatography , optoelectronics , electrical engineering , thermodynamics , biochemistry , physics , engineering , catalysis
A composite structure with two separately doped phases was introduced into Ni ‐doped LaCoO 3 ceramics to enhance its electrical conductivity while keeping low thermal conductivity. LaCo 0.9 Ni 0.1 O 3−δ nanoparticles were dispersed in the sol solution of La 0.9 Sr 0.1 Co 0.9 Ni 0.1 O 3−δ and separated from the solution by centrifugation, which were then calcined and consolidated using normal sintering in air. The electrical conductivity of the coated samples was obviously increased, although the Seebeck coefficient was slightly decreased by the above particle‐ coating method, resulting in a great improvement of power factor. The Seebeck coefficient and electrical conductivity are strongly dependent on the concentration of La 0.9 Sr 0.1 Co 0.9 Ni 0.1 O 3−δ sol, which affects the coating content, but the thermal conductivity is less affected by its concentration especially at room temperature. The power factor was increased to 2.58 × 10 −4 Wm −1 K −2 at room temperature, resulting in a twofold enhancement in a peak ZT value at 373 K for the coated sample as compared with that without coating.