Abstract
Herein, a high-performance electrocatalyst for oxygen reduction reaction (ORR), which is composed of highly dispersed Co nanoclusters loaded on conductive oxygen-deficient tungsten oxynitride framework structured with three-dimensionally ordered macropores (3DOM Co@WNO) was proposed. The tungsten oxynitride carrier decorated with oxygen vacancies can improve the conductivity and electrochemical stability of the catalyst. At the same time, it offers strong anchoring interaction and ensures good dispersion for the loaded Co metals, thus achieving high catalytic activity and durability. Theoretical calculations show that electron transfer occurs at the interface between WNO and Co4 leading to a higher accumulation of electrons around the Co site, promoting the ORR reaction kinetics. Due to these advantages, 3DOM Co@WNO was found to possess ORR activity comparable to Pt/C and superior primary Zn-air battery performance over Pt/C and excellent stability as well. This study advances the evolvement of high-efficiency and durable ORR electrocatalysts using intrinsically robust and conductive oxynitride support strategy with strong metal-support interactions.
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