| 초록 |
SOFC/SOEC are efficient energy conversion systems for H2 fuel operation and CO2 electrolysis. Conventionally, Ni/YSZ has shown outstanding performance as a fuel electrode. However, this metal cermet has suffered from degradation problems such as particle agglomeration, carbon deposition, etc. Especially, sulfur source such as hydrogen sulfide (H2S) involved in fuel/reaction gas has seriously deteriorated the cermet electrode. Meanwhile, perovskite oxide, such as Ruddlesden-Popper oxide is attractive fuel electrode candidate with superior sulfur tolerance, but has low catalytic activity. In this study, we prepared sulfur tolerant Ruddlesden-Popper oxide decorated with Ni-Fe alloy nanoparticles prepared by inducing in situ exsolution. This catalyst has been applied to anode of H2-SOFC and cathode of CO2 electrolysis of SOEC. The exsolved alloy nanoparticles improved the catalytic activity for H2 oxidation and CO2 reduction. This electrode catalyst showed decent fuel operation and electrolysis performance at 850 ℃. Also, the current density only decreased within ~10% in 100 ppm H2S containing atmosphere compared to dry H2 and 30%CO/CO2, indicating its superior sulfur tolerance. |
