Abstract
The sluggish catalytic kinetics of oxygen reduction reaction (ORR) on cathodes seriously impedes the widespread application of Mg-air and Zn-air batteries. Herein, this obstacle is overcome via the fabrication of Fe/Cu diatomic sites dispersed on a nitrogen-doped mesoporous carbon matrix, by pyrolyzing an in-situ metal-organic framework in the presence of molten salts. Both experimental results and theoretical calculations prove that the Fe/Cu diatomic sites can jointly cause asymmetric charge distribution and the moderate adsorption/desorption of oxygen-containing intermediates. The fabricated catalyst shows excellent durability and outstanding ORR catalytic activity in alkaline and neutral medium. The Mg-air and Zn-air batteries using this catalyst could provide superior discharge performance compared with those employing Pt/C benchmark, originated from the synergistic effect of Fe-N4 and Cu-N4 moieties for boosting the intrinsic catalytic activity towards ORR. Furthermore, its mesoporous structure facilitates the mass transfer and hence also contributes to the ORR catalysis during battery discharge.
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