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Promotion on electrochemical performance of Ba‐deficient Ba 1 − x Bi 0.05 Co 0.8 Nb 0.15 O 3 − δ cathode for intermediate temperature solid oxide fuel cells
Author(s) -
Le Shiru,
Feng Yujie,
Yuan Zaifang,
Zhang Naiqing,
Chi Dazhao
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4731
Subject(s) - cathode , oxide , materials science , electrochemistry , electrolyte , analytical chemistry (journal) , perovskite (structure) , oxygen , polarization (electrochemistry) , electrode , inorganic chemistry , chemistry , crystallography , metallurgy , organic chemistry , chromatography
Summary Reducing the operating temperature is the developing trend for solid oxide fuel cells. The key is to develop the cathode with high electrocatalytic activity for oxygen reduction reaction operated at reduced temperatures. Ba‐deficient Ba 1 − x Bi 0.05 Co 0.8 Nb 0.15 O 3 − δ (Ba 1 − x BCN, 0 ≤ x ≤ 0.10) are synthesized by solid‐state reaction method and evaluated as novel cathodes for intermediate‐temperature solid oxide fuel cells. Ba 1 − x BCN is preserved to primitive cubic perovskite phase and meets the compatibility requirement with gadolinium doped ceria oxide (GDC) electrolyte at 950°C. Though the Ba deficiency distorts the cell symmetry, it improves the charge transfer steps rapidly, ascribing to the improvement of oxygen vacancy concentration. The polarization resistance of Ba 0.95 BCN is as low as 0.056 Ω cm 2 in air at 700°C. The peak power density of the single cell with this cathode is as high as 1.41 W cm −2 at 750°C with wet H 2 as fuel and air as oxidant, indicating the great potential for enhanced performance of Co‐based cathodes with A‐site deficiency.