Cobalt‐Free Perovskite Cathodes for Solid Oxide Fuel Cells
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Abstract
Abstract The past decade has observed rapid growth in the development of cobalt‐free perovskite cathodes, which provide enhanced structure and operational stability at the operating temperature of intermediate temperature solid oxide fuel cells (IT‐SOFC, 600–800 °C) compared to its cobalt‐containing counterpart. This Review aims to present a comprehensive overview on the status and advances of the existing cobalt‐free perovskite cathodes for IT‐SOFCs by discussing electrochemical behaviors, thermal expansion properties, stabilities as well as the oxygen ionic and the electronic transport properties of these cobalt‐free perovskite cathode compositions, with primary emphasis on the relationship between the electrochemical performances and the materials science‐related factors. Among various cobalt‐free perovskite cathodes presented in this Review, niobium‐doped compositions generally show lower polarization resistances relative to other cathode compositions.
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