Abstract
With high theoretical energy density, rechargeable lithium-oxygen (Li-O2) batteries are considered to be the most promising energy storage and conversion system. However, its development is seriously hampered by the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), resulting in notorious overpotential and mediocre cycle stability. Here, we elaborately design the free-standing NiSe2 @NiO heterostructure on conductive carbon cloth as oxygen electrode for Li-O2 batteries. The electronic redistribution at the interface between NiSe2 and NiO caused by the strong electronic interaction can strengthen electron transfer and optimize the adsorption energy of reaction intermediates, thereby immensely boosting the ORR/OER kinetics. Therefore, Li-O2 batteries with NiSe2 @NiO oxygen electrodes show the highly discharge capacity of 11512 mAh g−1 at 500 mA g−1 and outstanding stability of over 360 h. This work enriches the understanding on the influence of electronic structure modulation of heterostructural transition metal dichalcogenides on their catalytic activity towards oxygen electrode reactions in Li-O2 batteries.
Published Version
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