Abstract
There is an urgent need to develop high power density, economical, and safe energy-storage systems. In the last few decades, zinc-air batteries have attracted widespread interest because of the superior safety, high energy density (1086 Wh kg-1), low cost, and natural abundance of Zn. However, Zinc-air batteries are limited by the poor durability and sluggish kinetics of and oxygen evolution/ reduction reactions. In this work, different transition metal (M= Fe, Co and Ni) ions are doped on the surface of MnO2 to activate the neighbor Mn active sites via cation insertion engineering. As a result, M-MnO2-CNTs exhibits superior oxygen evolution/ reduction reactions activities with the low potential difference (ΔE) of 0.85 V, high power density of 534 mW cm-2, and high charge-discharge stability of 200 hours.
Published Version
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