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The oxygen evolution reaction (OER) is a bottleneck in overall water splitting due to the involvement of the four-electron process and requires a high overpotential. This hinders the stability and durability of electrocatalysts over a longer period. Herein, we report flower-like NiCo 2 O 4 decorated on carbon nanostructures synthesized using a one-pot wet chemical method as an OER electrocatalyst in an alkaline medium. The catalytic activities were characterized by various electrochemical measurements including linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and turnover frequency (TOF). 90 % NiCo 2 O 4 @rGO/ f -MWCNT demonstrated a higher OER activity compared to stand-alone NiCo 2 O 4 , 90 % NiCo 2 O 4 @rGO, 90 % NiCo 2 O 4 @ f -MWCNT and 80 % NiCo 2 O 4 @rGO/ f -MWCNT. [Display omitted] • NiCo 2 O 4 @NCHy (NCO@NCHy) as oxygen-evolving electrocatalysts in an alkaline medium. • Flower-like pattern distributed onto the surface of nanocarbon hybrid. • The overpotential of the NiCo 2 O 4 @NCHy was 287 mV at a current density of 10 mA/cm2. • NiCo 2 O 4 @NCHy exhibited higher OER compared to NCO and NCO@other carbon nanostructures. • The strong interface between NCO along NCHy made the material potential towards OER. [ABSTRACT FROM AUTHOR]