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Meeting MS&T25: Materials Science & Technology
Symposium Energy Materials for Sustainable Development
Presentation Title Designing the Intergranular Phase for Decoupling the Strongly Correlated Thermoelectric Parameters in Perovskite Oxide Ceramics
Author(s) Cesar-Octavio Romo-De-La-Cruz, Sergio-Andres Paredes-Navia, Yun Chen, Xueyan Song
On-Site Speaker (Planned) Cesar-Octavio Romo-De-La-Cruz
Abstract Scope CaMnO3-δ is a versatile perovskite with various applications in energy storage and energy conversion. Nevertheless, as thermoelectrics, the peaking Figure of Merit ZT of pristine CaMnO3-δ is ~0.2 and presents a substantial challenge for further improving it through cation doping due to its strongly coupled electrical and thermal properties. We thus explored the introduction of Cu dopants, which possess limited solubility in CaMnO3-δ lattice, instead leading to Cu0.95Ca0.02Mn0.03O percolating at the grain boundaries of n-type CaMnO3Cux. Cu0.95Ca0.02Mn0.03O experiences transitioning of p-type to n-type at 975K, and possesses an electrical resistivity 150 times higher than the undoped CaMnO3-δ. Remarkably, CaMnO3Cux composite with a high density of p-n junctions facilitated by the intergranular Cu0.95Ca0.02Mn0.03O presents up to 97% reduction of electrical resistivity compared to undoped CaMnO3-δ. The present study provides a viable approach to designing the microstructure of oxide ceramics and simultaneously improving the thermoelectric performance in CaMnO3-δ.

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