科研之友
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摘要
Improving the performance of solid oxide fuel cells (SOFC) at intermediate temperatures has been a great challenge for the development of a new generation of cheap and durable IT-SOFC. A unique cell design consisting of a Ni-BaZr0.1Ce0.7Y0.1Yb0.1O3-Δ anode a Gd-doped ceria electrolyte and a La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) fiber cathode to show a high-performance low-temperature SOFC. When evaluated in both symmetrical and single cells the LSCF nanofiber-based cathodes show smaller activation energy and lower polarization resistance for oxygen reduction reaction (ORR) than the nano-LSCF powder. The improvement in ORR kinetics can be attributed to the unique electrode architecture that assists efficient mass/charge transport. Additionally the geometric modelling and simulation indicates that thinner and longer fibers are more efficient in facilitating both mass and charge transport.
