A durable, high-performance hollow-nanofiber cathode for intermediate-temperature fuel cells
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Abstract Hollow nanofibers of PrBa 0.5 Sr 0.5 Co 2 O 5+ δ (PBSC), created by an electrospinning process, are assembled into a three dimensional (3D) fibrous porous electrode, providing facile pathways for gas transport and excellent electrical conductivity for efficient charge transfer and, thus, greatly enhancing the rate of oxygen reduction reactions (ORR), as confirmed by the small electrode polarization resistance and low activation energy. A simple geometric modeling suggests that an electrode with longer fibers tends to
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