Abstract
Core-shell catalysts have been extensively researched in enhancing the activity of oxygen reduction reaction (ORR) by modifying bimetallic electrons. However, the conventional methods for synthesizing core-shell structures are not appropriate for supported catalysts. Here, we present a strategy to support ordered Ag@Pd core-shell structures on the Ti4O7 surface by ascorbic acid-assisted galvanic replacement (GR). The addition of appropriate amounts of Pd precursors during GR plays a crucial role in the morphology and activity of the ordered Ag@Pd/Ti4O7. Ordered Ag@Pd/Ti4O7 exhibits a half-wave potential of 0.895 V and mass activity of 1.22 A mgPd-1 at 0.9 V, where the latter is approximately 13.7 times higher than that of 20% Pt/C. Excitingly, the zinc-air battery with an ordered Ag@Pd/Ti4O7 catalyst as the cathode shows a maximum power density of 174 mW cm-2. The ordered characteristics of the Ag@Pd alloy and its strong electron transfer with the corrosion-resistant Ti4O7 effectively inhibit the oxidation of Ag, thus improving the catalytic activity and stability. The ingenious combination of ascorbic acid with GR provides a feasible mechanism for the synthesis of ordered bimetallic core-shell structure on oxide surfaces.
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