High Performance La_0.5(Ba_0.2Sr_0.2Ca_0.1)Co_0.8Fe_0.2O_3-δ- BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3-δ Composite Cathode for Proton-Conducting Solid Oxide Fuel Cells

Abstract

Lack of suitable cathode restricts the development of proton-conducting solid oxide fuel cell (H-SOFC). Perovskite material LBSCCF was synthesized by sol-gel method in this study. It had good chemical compatibility with the electrolyte material BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb). The average thermal expansion coefficients of LBSCCF was 19.92×10-6 K-1, higher than that of BZCYYb. The variations of oxygen content under different temperatures ensures enough oxygen vacancies in the cathode during the operating temperature. Single cells with LBSCCF-BZCYYb/BZCYYb/Ni-BZCYYb configuration were fabricated and tested. The maximum power density of 965.4 mW cm-2 was obtained at 750 °C, demonstrating that the LBSCCF-BZCYY composite material is a promising candidate cathode for H-SOFC.