Abstract
AbstractThe exploration of efficient electrocatalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential for fuel cells and metal‐air batteries. In this study, we developed 3 D hollow‐structured NiCo2O4/C nanoparticles with interconnected pores as bifunctional electrocatalysts, which are transformed from solid NiCo2 alloy nanoparticles through the Kirkendall effect. The unique hollow structure of NiCo2O4 nanoparticles increases the number of active sites and improves contact with the electrolyte to result in excellent ORR and OER performances. In addition, the hollow‐structured NiCo2O4/C nanoparticles exhibit superior long‐term stability for both the ORR and OER compared to commercial Pt/C. The template‐ and surfactant‐free synthetic strategy could be used for the low‐cost and large‐scale synthesis of hollow‐structured materials, which would facilitate the screening of high‐efficiency catalysts for energy conversion.
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