High Performance La_(0.5)(Ba_(0.2)Sr_(0.2)Ca_(0.1))Co_(0.8)Fe_(0.2)O_(3-δ)-BaZr_(0.1)Ce_(0.7)Y_(0.1)Yb_(0.1)O_(3-δ) Composite Cathode for Proton-Conducting Solid Oxide Fuel Cells

摘要

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 BaZr_(0.1)Ce_(0.7)Y_(0.1)Yb_(0.1)O_(3-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.