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Composites of Single/Double Perovskites as Cathodes for Solid Oxide Fuel Cells
Author(s) -
Bu Yunfei,
Chen Yu,
Wei Tao,
Lai Samson,
Ding Dong,
Sun Haibin,
Zhen Dongxin,
Xiong Xunhui,
Zhong Qin
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600041
Subject(s) - materials science , cathode , scanning electron microscope , transmission electron microscopy , perovskite (structure) , sintering , oxide , composite number , solid oxide fuel cell , chemical engineering , analytical chemistry (journal) , composite material , nanotechnology , metallurgy , chemistry , anode , electrode , chromatography , engineering
The state‐of‐art cathode materials PrBaCo 2 O 5+ δ (PBC) and La 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3− δ (LSCF) are mixed into a composite cathode for intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). Analysis by X‐ray powder diffraction (XRD) and scanning electron microscopy (SEM) demonstrates that a structure comprising a single and double perovskite is obtained upon sintering in air at 1000 °C. Possible chemical interdiffusion between PBC and LSCF grains is further investigated by transmission electron microscopy and scanning transmission electron microscopy combined with electron energy loss spectroscopy. The composite cathode PBC+LSCF (with mass ratio 6:4) shows improved performance compared to either PBC or LSCF alone, achieving total area resistance (ASR) values in air of 0.017, 0.032, 0.07, 0.16, and 0.32 Ω cm −2 at 800, 750, 700, 650, and 600 °C, respectively. The PBC‐LSCF 64 cell delivered power densities of 1103 mW cm −2 at 750 °C, which were enhanced by 26 % and 35 % compared to the initial PBC and LSCF powders, respectively.