Abstract
The lack of low-cost and high-activity bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is an important factor restricting the massive application of rechargeable zinc-air batteries (ZABs). Herein, nitrogen-doped carbon fibers (NCFs) loaded with Co/Co2Mn3O8 alloy nanoparticles (Co/Co2Mn3O8@NCFs) were reported as a bifunctional oxygen electrocatalyst for rechargeable ZABs. The hierarchical porous structure of NCFs and strong synergetic coupling between Co/Co2Mn3O8 alloys and Co-Nx sites accelerated the kinetics of ORR reaction. The abundant lattice oxygen and N-doped sites promoted the efficient OER process. Benefiting from the above advantages, a rechargeable ZAB assembled with Co/Co2Mn3O8@NCFs delivered an excellent energy density of 968.10 Wh kg−1 (normalized to the mass of consumed zinc) and outstanding stable cyclability (steady cycle charge and discharge at 10 mA cm−2 for 120 h), surpassing state-of-the-art Pt/C catalyst (830.86 Wh kg−1/75 h). This study demonstrated the potential value of Co/Co2Mn3O8 alloys in energy conversion and storage.
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