FIELD: chemistry.
SUBSTANCE: invention relates to an oxygen reduction reaction (ORR) catalyst and a method for preparing such a catalyst. Oxygen reduction reaction (ORR) catalyst contains carbon substrate; first amorphous metal oxide layer overlying a surface the substrate; first platinum layer overlying the first amorphous metal oxide layer; second amorphous metal oxide layer overlying the first platinum layer; second platinum layer overlying the amorphous metal oxide layer. Amorphous metal oxide layers include a plurality of discontinuous elongated structures. Platinum catalyst forms a thin, electrically interconnected network structure overlying the metal oxide. ORR catalyst is prepared by alternating the deposition of metal oxide and platinum catalyst, for example, using physical vapor deposition. ORR catalyst has a specific activity of at least 1,000 mcA/cm2 Pt and approaches or achieves bulk Pt activity.
EFFECT: durability and high catalyst activity.
20 cl, 11 dwg
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