A multi-phase catalyst coating, composed of a thin-film PrBa 0.8 Ca 0.2 Co 2 O 5+d (PBCC) decorated with nanoparticles (NPs) of BaCoO 3Àx and PrCoO 3Àx , has dramatically enhanced the rate of oxygen reduction reaction. Oxygen molecules adsorb and dissociate rapidly on the NPs due to enriched surface oxygen vacancies, while the dissociated oxygen species transport quickly through the PBCC film into the cathode.
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