Member, The American Ceramic Society.
Enhanced Thermoelectric Performance of Separately Ni-Doped and Ni/Sr-Codoped LaCoO3 Nanocomposites
Article first published online: 9 JUL 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 11, pages 3562–3568, November 2012
How to Cite
Li, F., Li, J.-F. (2012), Enhanced Thermoelectric Performance of Separately Ni-Doped and Ni/Sr-Codoped LaCoO3 Nanocomposites. Journal of the American Ceramic Society, 95: 3562–3568. doi: 10.1111/j.1551-2916.2012.05332.x
- Issue published online: 2 NOV 2012
- Article first published online: 9 JUL 2012
- Manuscript Accepted: 2 JUN 2012
- Manuscript Received: 30 DEC 2011
- National Nature Science Foundation. Grant Numbers: 51172121, 50820145203
- National Basic Research Program of China. Grant Number: 2007CB607500
- national high technology research and development program. Grant Number: 2012AA051104
A composite structure with two separately doped phases was introduced into Ni-doped LaCoO3 ceramics to enhance its electrical conductivity while keeping low thermal conductivity. LaCo0.9Ni0.1O3−δ nanoparticles were dispersed in the sol solution of La0.9Sr0.1Co0.9Ni0.1O3−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 La0.9Sr0.1Co0.9Ni0.1O3−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.