Floret assembly of NiCo2O4@Tailored nanostructured carbon support for oxygen evolution reaction in alkaline medium

Abstract

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 NiCo2O4 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 % NiCo2O4@rGO/f-MWCNT demonstrated a higher OER activity compared to stand-alone NiCo2O4, 90 % NiCo2O4@rGO, 90 % NiCo2O4@f-MWCNT and 80 % NiCo2O4@rGO/f-MWCNT.