Abstract
To develop next generation solid oxide fuel cells operated at reduced temperatures with a wide variety of hydrocarbon fuels, surface modification of electrodes is an effective approach to enhancing the performance of both the state-of-the-art Ni-YSZ anode and La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) cathodes. For example,, BaO nano-islands on the surfaces of Ni grains greatly improved the coking-tolerance of Ni-YSZ anode through a water mediated carbon removal process. Similarly, an efficient catalyst layer was created in Ni-YSZ anodes when proper amount of BaCO3 was added to the NiO-YSZ anode support in the early stage of processing. For SOFC cathodes, a solution infiltration process has been used to coat various active catalysts on the surface of LSCF cathodes to enhance the catalytic activity and stability. The surface coatings include discrete particles of doped ceria and samarium doped strontium cobaltite (SSC), and dense, continuous thin films of La1-xSrxMnO3−δ (LSM), Pr0.75Sr0.2MnO3−δ (PSM), and PrSrCoMnO6-δ (PSCM).
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