Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6602623 | Electrochimica Acta | 2018 | 33 Pages |
Abstract
Cobalt-free perovskite oxides, BaFeO3-δ and BaM0.05Fe0.95O3-δ (Mâ¯=â¯Ti, Zr and Ce), were prepared as the cathode of intermediate-temperature solid oxide fuel cells (IT-SOFCs). High temperature X-ray diffraction (HT-XRD) results show that BaFeO3-δ and BaTi0.05Fe0.95O3-δ (BTF) have a complex phase composition, and the phase composition changes with temperature. BaZr0.05Fe0.95O3-δ (BZF) has a cubic perovskite structure above 400â¯Â°C, while BaCe0.05Fe0.95O3-δ (BCF) has a cubic perovskite structure from room temperature (25â¯Â°C) to 1000â¯Â°C. Thermogravimetric analysis (TG) and oxygen temperature-programmed desorption (O2-TPD) analysis reveal that the phase transition affects the oxygen-release properties of these materials. In contrast to BaFeO3-δ and BTF showing phase-transition-dependent electrical conductivity, BZF and BCF show typical curves similar to other mixed ionic-electronic perovskite oxides. On an electrolyte of Sm0.2Ce0.8O1.9 (SDC), a single cell with a BCF cathode exhibits polarization resistances of 0.027, 0.046, 0.087 and 0.186â¯Î©â¯cm2â¯at 750, 700, 650 and 600â¯Â°C, respectively. The peak power densities of the single cell are 482, 415 and 315â¯mWâ¯cm-2â¯at 750, 700 and 650â¯Â°C, respectively. This indicates that the Co-free BCF has a good electrocatalytic activity toward the oxygen reduction reaction and is a promising cathode for IT-SOFCs.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Huanying Liu, Kaiyue Zhu, Yan Liu, Wenping Li, Lili Cai, Xuefeng Zhu, Mojie Cheng, Weishen Yang,