|About this Abstract
||MS&T22: Materials Science & Technology
||Energy Materials for Sustainable Development
||Probing BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.2-X</sub>Y<sub>X</sub>O<sub>3-δ</sub> Triple-Conductors as Cathode Materials for Protonic Ceramic Fuel Cells
||Jack H. Duffy, Yuqing Meng, Harry W. Abernathy, Kyle S. Brinkman
|On-Site Speaker (Planned)
||Jack H. Duffy
Protonic ceramic fuel cells (PCFCs) are a promising technology to efficiently convert fuel into energy. However, sluggish kinetics at intermediate temperatures necessitates improved cathode materials for future commercialization. In this work, BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.2-X</sub>Y<sub>X</sub>O<sub>3-δ</sub> (BCFZY<sub>X</sub>) triple-conducting materials are characterized for their bulk material properties. Oxygen permeation and hydrogen permeation are utilized to probe the bulk ionic conductivity of the compositional range. DC four-point probe with electrical conductivity relaxation revealed sufficient electrical conductivity and excellent surface exchange kinetics. With increasing yttrium content, there is a general tradeoff between the materials’ bulk conductivity with their surface reaction kinetics. These measurements revealed the novel material BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Y<sub>0.2</sub>O<sub>3-δ</sub> (BCFY), which is mixed with BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3-δ</sub> (BCZYYb) to form a novel composite cathode. The BCFY-BCZYYb cathode is synthesized in 4:1, 2:1, and 1:1 ratios to achieve high performance PCFC composite cathodes. These results highlight the tunability of triple ionic-electronic conductors for both single-phase and composite cathode development.