직접 암모니아 연료전지의 Perovskite 구조 기반 Anode의 B-site 화학양론 제어를 통한 성능 개선 연구

Abstract

Ammonia has high energy density and the advantage of utilizing existing infrastructure, making it increasingly significant as a direct fuel for energy production in solid oxide fuel cell (SOFC). However, ammonia-fueled SOFC have a lower power density compared to hydrogen fuel cells. To address this issue, this study investigates Sr2Fe1.6M0.5O6-δ, an electrode material based on Sr2Fe1.5M0.5O6-δ with high conductivity and stability under reducing environments, by further increasing the Fe content. The structural stability and the formation of Fe nanoparticles on the electrode surface were confirmed through XRD, SEM, and TEM analyses. The electrochemical performance and catalytic properties of the fuel cells were evaluated. As the Fe content increased, more Fe nanoparticles were formed under reducing conditions, enhancing both electrochemical and catalytic performance. Notably, the electrochemical performance of the DA-SOFC increased by approximately 2.4 times, achieving performance comparable to fuel-electrode-supported DA-SOFCs. In conclusion, this study demonstrates a viable solution to overcome the performance limitations of oxide electrode as anode.