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Abstract

We investigated mesoporous Nd0.7Sr0.3CoO3–?? electrocatalytic properties for the ORR. Mesoporous Nd0.7Sr0.3CoO3−?? has been prepared with a polymethyl methacrylate (PMMA) hard-template for an energy storage system. The prepared 3-dimensionally ordered mesoporous Nd0.7Sr0.3CoO3-??. (3DOM-NSC) has a well-developed mesoporous structure and has high specific surface area (22.0 m2 g-1). The catalytic activity for the oxygen reduction reaction (ORR) has been studied by a rotating-ring-disk electrode (RRDE). In the ORR test, a limiting current density of 3DOM-NSC was 5.83 mA cm-2 at 0.7 V (V vs. Hg/HgO) with 1600 rpm and the value was good compared with that of Pt/C. Moreover, it shows the stable and excellent performance in a hybrid Li-air battery