Tantalum doped La 0.6 Sr 0.4 FeO 3− δ electrodes for symmetrical proton conducting solid oxide fuel cells

• Published in: Reaction chemistry & engineering 2023-03, Vol.8 (4), p.770-777
• Main Authors: Peng, Shujun, Yin, Zongjie, Xue, Jian
• Format: Article
• Language: English
• ISSN: 2058-9883; 2058-9883
• DOI: 10.1039/D2RE00553K

Symmetrical solid oxide fuel cells (SSOFCs) possessing the same electrodes have attracted plenty of scientific interest for lots of advantages compared with conventional SOFCs with different anodes and cathodes. In this paper, a 10 mol% Ta doped perovskite-type oxide La 0.6 Sr 0.4 FeO 3− δ , named La 0.6 Sr 0.4 Fe 0.9 Ta 0.1 O 3− δ (LSFT), is studied as both an anode and cathode for proton conducting SOFCs (H-SOFCs) operated between 500 and 800 °C. LSFT is chemically compatible with a BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3− δ (BZCYYb) electrolyte, even co-sintering at 1000 °C for 10 h. The activating energy ( E a ) of electrical conductivity for LSFT is only 0.44 eV. At 800 °C, the polarization resistances ( R ps ) for LSFT barely reach 0.02 Ω cm 2 in air and 0.1 Ω cm 2 in H 2 , and the corresponding E a values are only 1.39 and 0.91 eV, respectively. The peak power density (PPD) of a symmetrical H-SOFC (SHSOFC) using LSFT electrodes is 0.697 W cm −2 at 800 °C. Herein, LSFT should be a promising electrode for SHSOFCs.