About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Ceramics for Clean Hydrogen
|
| Presentation Title |
Boosted Oxygen Reduction/Evolution Reaction Activity in a Novel High-Entropy Double Perovskite Oxide for High-Performance Reversible Solid Oxide Electrochemical Cells |
| Author(s) |
Ryo Kitamura, Eric Yoshida, Deeksha Kodangal, Yuki Nishikawa, Oriyomi Rasak Opetubo, Pan Liquan, Jacob Conrad, Rajendra Kumar Bordia, Fei Peng, Dilpuneet Aidhy, Kai He, Jianhua Tong |
| On-Site Speaker (Planned) |
Ryo Kitamura |
| Abstract Scope |
PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) is a promising oxygen electrode for solid oxide electrochemical cells (SOECs), yet it suffers from phase instability and lower activity at intermediate temperatures. Here, we developed a high-entropy double perovskite, PrBa0.5Sr0.5[Co1.5Fe0.5]2/3Ni1/12Zn1/12Mn1/12Ga1/12O5+δ (PBSCFNMZG) and improved the oxygen reduction reaction/oxygen evolution reaction (ORR/OER) activity than PBSCF, partly due to an increased oxygen vacancy concentration. In addition, PBSCFNMZG exhibits a reduced thermal expansion coefficient, which enhances interfacial compatibility with the electrolyte buffer layer. When applied to YSZ-based SOECs, the electrode demonstrates excellent performance in both operation modes: at 750 °C, it achieves a peak power density of 2.21 W cm-2 in fuel cell mode and a current density of 1.04 A cm-2 at 1.3 V in electrolysis mode, along with negligible degradation in a stability test in fuel cell mode. These results highlight high-entropy design as an effective strategy for developing highly efficient and durable SOEC oxygen electrodes. |
