| Summary: | In this article, a novel Co<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub> composite is synthesized by applying two-step methods. ZIF-67 is synthesized and used as a template for the synthesis of the composite. The composite is designed by using the effective photocatalytic properties of Co<sub>3</sub>O<sub>4</sub> and TiO<sub>2</sub>. The resulting synthesized composite is supposed to offer superior properties compared to their counterparts. The synthesized Co<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub> composite is characterized by powder X-ray diffraction (PXRD), Brunauer–Emmet–Teller (BET), atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical water splitting, including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) studies on the Co<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub> composite, is evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) analysis in a 2M aqueous KOH electrolyte. The current generation stability of these samples is deliberated by chronoamperometric measurements. It is observed, from LSV results at a 1 mV/s scan rate, that metal oxides incorporated on other metal oxides have a higher current density and lower onset potential as compared to pure metal oxides. From the obtained results, it has become evident that synthesized studies on the Co<sub>3</sub>O<sub>4</sub>@TiO<sub>2</sub> composite possess significant potential for electrochemical water splitting with the lowest onset potential, highest current density, better OER, and HER activity.
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