About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
High Thermoelectric Seebeck Coefficient in DyCoO3 and Processing Optimization for Its Potential Application in Energy Conversion |
| Author(s) |
Geoffroy Gauneau, Cesar-Octavio Romo-De-La-Cruz, Fuming Jiang, Xueyan Song |
| On-Site Speaker (Planned) |
Geoffroy Gauneau |
| Abstract Scope |
Lanthanide-based cobaltites of pristine DyCoO3, exhibit an astonishingly large Seebeck coefficient ~1000μV/K at room temperature. However, its potential for thermoelectric application is hindered by its high resistivity and low peaking thermoelectric figure-of-merit of zT, which is usually ~0.05. Rather than directly adding dopants to modify the carrier concentrations in the DyCoO3, the present work tackles the engineering approach through controlling the ceramics processing to improve the ceramics' thermoelectric performance. High-density polycrystalline ceramics were synthesized using the sol-gel route, followed by calcination and sintering. The performance improvement at a factor of 3, achieving zT ~0.143, was achieved in DyCoO3, by controlling the molar ratio of citric acid to metal nitrates in the sol-gel process and optimizing the sintering temperature. The present work highlights the critical role of processing parameters in tailoring oxide thermoelectric properties and paves the way for further improving the thermoelectric performance through tuning carrier concentrations using dopants. |