A La<inf>0.8</inf>Sr<inf>0.2</inf>MnO<inf>3</inf>/La<inf>0.6</inf>Sr<inf>0.4</inf>Co<inf>0.2</inf>Fe<inf>0.8</inf>O<inf>3-d</inf> core–shell structured cathode by a rapid sintering process for solid oxide fuel cells
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© 2016 Hydrogen Energy Publications LLCA La0.8Sr0.2MnO3 (LSM)/La0.6Sr0.4Co0.2Fe0.8O3-d (LSCF) core–shell structured composite cathode of solid oxide fuel cells (SOFCs) has been fabricated by wet infiltration followed by a rapid sintering (RS) process. The RS is carried out by placing LSCF infiltrated LSM electrodes directly into a preheated furnace at 800 °C for 10 min and cooling down very quickly. The heating and cooling step takes about 20 s, substantially shorter than 10 h in the case of conventional sintering (CS) process. The results indicate the formation of a continuous and almost non-porous LSCF thin film on the LSM scaffold, forming a LSCF/LSM core–shell structure. Such RS-formed infiltrated LSCF–LSM cathodes show an electrode polarization resistance of 2.1 O cm2 at 700 °C, substantially smaller than 88.2 O cm2 of pristine LSM electrode. The core–shell structured LSCF–LSM electrodes also show good operating stability at 700 °C and 600 °C over 24–40 h.
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