About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Advancing Misfit-Layered Calcium Cobaltite: Boosting Thermoelectric Efficiency through Electrospun Nanoribbons and Spark Plasma Texturing |
| Author(s) |
Armin Feldhoff, Katharina Kruppa , Itzhak I. Maor, Anat Karlin , Kristina Kebel , Frank Steinbach, Hilke Petersen, Dorothea Stobitzer, Wenjie Xie, Anke Weidenkaff, Gennady E. Shter , Meirav Mann-Lahav, Gideon S. Grader |
| On-Site Speaker (Planned) |
Armin Feldhoff |
| Abstract Scope |
The misfit-layered cobaltite [Ca2CoO3-δ]0.62[CoO2] (CCO) is a promising high-temperature thermoelectric material, useful in the generation of electricity from waste heat. Its anisotropic properties necessitate texturing and nanostructuring to enhance thermoelectric performance. This study explores electrospinning and dual sintering processes for their effects on CCO's texturization and thermoelectric properties. Electrospinning creates nanoribbons that, upon sintering, contribute to textured ceramics by improving orientation and densification. Texturing is analyzed via X-ray diffraction, while microstructure-characterizing technologies include scanning and transmission electron microscopy, and energy dispersive X-ray spectroscopy. The thermoelectric properties improved significantly, with a power factor increase to 16.3 μW cm-1 K-2 and a figure of merit zT reaching 0.53 at 1073 K through spark plasma sintering (SPS) and subsequent spark plasma texturing (SPT), setting new standards for undoped polycrystalline oxide ceramics. The study demonstrates that CCO nanoribbons combined with SPS-SPT yield dense, well-textured ceramics with enhanced thermoelectric properties. |