Enhanced Performance of The GdBaCo_2O_5+δ Cathode with Active Ce_0.8Sm_0.2O_1.9 Nanoparticles

摘要

Cathodic polarization resistance (R_p) critically limits the performance of intermediate temperature solid oxide fuel cell (IT-SOFC ). In this paper, high performance GdBaGo_2O_5+δ -Ce_0.8Sm_0.2O_1.9 (GBCO-SDC) nano-composite cathodes were fabricated via an ion-infiltration method and their chemical compatibility, microstructures and electrochemical properties were evaluated. Good chemical compatibility was found between GBCO and SDC components. Active SDC nano-particles (~40nm) formed continuous ionic-conducting phase on the surface of GBCO backbone, which significantly enhanced the electrocatalytic activity for oxygen reduction reaction. The composite cathode with 3.3mg-cm~(-2) SDC loading showed encouragingly low polarization resistance values of 0.55Ω·cm~2 and 0.096Ω·cm~2 at 500℃ and 600℃, respectively, which implies their promising application for cathodes of IT-SOFC.