Work

Boosting the thermoelectric performance of Ca3Co4O9 ceramics through optimized precursor powder particle size

Year: 2025

Type: article

Abstract: Ca3Co4O9 (CCO349) is a promising p-type thermoelectric ceramic oxide with high thermoelectric power factor PF, and reasonable thermoelectric figure-of-merit zT. CCO349 bulk ceramics were prepared from precursor powders with average particle sizes d 50 ranging from about 10 µm to 0.5 µm, and conventional sintering at 920 °C. Remarkably, ceramics made from powders with optimum d 50 of 1 µm exhibit enhanced electrical conductivity σ ⊥ and power factor PF ⊥ of 11,100 S/m and 340 µW/m·K2 at 800 °C, respectively. The ceramics exhibit anisotropic microstructures with Lotgering factors larger than 0.9, and anisotropic thermoelectric properties: the electrical conductivity σ ⊥ and power factor PF ⊥ are higher by 90% and 110% as compared to σ ‖ and PF ‖ at 800 °C, respectively, and the zT ⊥ reaches nearly 0.16 at 800 °C. Moreover, a transverse thermoelectric device was fabricated based on alternating layers of CCO349 and silver with a power output of 5 mW at ΔT = 190 K. Graphical abstract

Source: Journal of materials research/Pratt's guide to venture capital sources

DOI: 10.1557/s43578-025-01610-x

Authors: Ahmed A. S. Ibrahim, Jörg Töpfer

Institutions: Ernst Abbe University of Applied Sciences Jena, Friedrich Schiller University Jena

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,490