Abstract
The introduction of noble metal into spinel structure is an effective strategy to develop efficient oxygen evolution/reduction reaction (OER/ORR) catalysts. Herein, surface Cooct is substituted by Ruoct in Rux-Mn0.5Co2.5-xO4/NCNTs by ion-exchange, where presence of Ruoct─O─Cooct unit facilitates electron transfer. This strong electron coupling effect leads downward shift in d-band center and a narrowing of d-p bandgap. The increased charge density of Cooct bridged with Ruoct dioxygen optimizes adsorption of oxygen intermediates (*OH) and occupation of electrons in eg-orbital octahedral. The measured ORR/OER voltage difference is only 0.71V. The peak power density of assembled zinc-air battery reaches 148.8mW h cm-2, and energy density at 100mA cm-2 reaches 813.6mA h gZn -1, approaching a theoretical value of 820mA h gZn -1. The catalyst demonstrates stable operation for over 500h at 10mA cm-2 and over 200h at 50mA cm-2. This work provides new insights to guide fabrication of advanced oxygen electrocatalysts.
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