| Summary: | <p>Herein, a simple microwave assisted combustion approach is utilized for the synthesis of nano-sized Cr substituted Ni ferrites (NiCr<sub>x</sub>Fe<sub>2-x</sub>O<sub>4</sub>). The as obtained materials were further sintered at 450°C in air and then utilized for physicochemical and electrochemical characterizations. X-ray diffraction (XRD) patterns showing sharp peaks confirmed the formation of single phase cubic spinel structure. TEM image reveals the formation of nanocrystalline particles having size in range of 10-20 nm. Further, the electrocatalytic oxygen evolution reaction (OER) of as-synthesized materials was studied by linear sweep voltammetry in alkaline solution. The OER results showed that co-substitution of Cr in NiFe<sub>2</sub>O<sub>4</sub> matrix improved the electrocatalytic activity of the oxides towards OER. The NiCr<sub>0.5</sub>Fe<sub>1.5</sub>O<sub>4</sub> shows the best OER performance in 1.0 M KOH solution. It achieved a low overpotential of about 320 mV at 10 mA/cm<sup>2</sup> current density, which is comparable to other reported electrocatalysts. Tafel parameters and order of reaction were also in close agreements with literature values.</p><p> </p><p>DOI: <a href="http://dx.doi.org/10.17807/orbital.v12i3.1507">http://dx.doi.org/10.17807/orbital.v12i3.1507</a></p>
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