FeCoNi ternary alloy embedded mesoporous carbon nanofiber: An efficient oxygen evolution catalyst for rechargeable zinc-air battery.

Graphical abstract Highlights • FeCoNi ternary alloy embedded mesoporous carbon nanofibers has been fabricated. • FeCoNi-CNF shows excellent electrocatalytic activities for OER. • Zn-air battery with FeCoNi-CNF exhibits high power density and a long-term stability. Abstract FeCoNi alloy embedded mesoporous carbon nanofiber (FeCoNi-CNF) has been prepared via electrospinning and subsequent carbonization. Benefiting from the unique FeCoNi alloy composition and porous 1D carbon structure, FeCoNi-CNF presented an overpotential of 220 mV at 10 mA cm−2 and a Tafel slope of 57 mV dec−1 as an OER catalyst. It also exhibited a low discharge–charge voltage gap (0.88 V, at 20 mA cm−2), higher power density (73 mW cm−2, at 80 mA cm−2) and long-term stability when testing for Zn-air battery. [ABSTRACT FROM AUTHOR]