Presentation Information
[3G04]In situ Ir-Fe alloying on Sr2Fe1.5Mo0.5O6 for durable solid oxide cell air electrodes
*Jiyoon Shin1, Pei-Chen Su1 (1. School of Mechanical and Aerospace Engineering, Nanyang Technological University)
We show a new catalyst design for SOCs that addresses the persistent challenge of achieving highly active yet stable air electrodes. By depositing Ir nanoparticles onto SFMO, we exploit the natural Ir-Fe miscibility to trigger in situ alloy formation at 800 oC in air. This alloy interface shows good thermal stability and boosts the oxygen exchange reactions at 800 C over 50 hours. Advanced electron microscopy, surface spectroscopy, and in situ XAS confirm the formation of the alloy and its stability. Unlike conventional exsolution techniques requiring reducing atmospheres, our method creates a firmly anchored, catalytically active alloy under operational air conditions. The result is SOC air electrodes with high ORR/OER activity and durability, showing a novel strategy for tailoring surface engineering in oxidizing environments for energy conversion applications.