<p>Designing efficient electrocatalysts for hydrogen and oxygen evolution reactions is vital for renewable energy systems. This work reports a sulfidated-MXene supported copper cobalt spinel oxide (MXS@CuCo₂O₄) as a bifunctional electrocatalyst for oxygen and hydrogen evolution reactions (OER and HER). The composite was synthesized via a direct thermal sulfidation of MXene at 650&#xa0;°C for 1&#xa0;h followed by a simple solvothermal method at 150&#xa0;°C for 3&#xa0;h, offering a noble metal-free alternative electrocatalyst. The synergistic effect of MXene and sulfur, abundant active sites, and hybridization with spinel oxide provide excellent electrocatalytic performance under alkaline conditions. Specifically, the MXS@CuCo₂O₄ electrocatalyst exhibits low over-potentials of 471 mV at 50 mA·cm⁻² for OER with a Tafel slope of 73&#xa0;mV.dec⁻¹ and an over-potential of 490 mV at 50 mA·cm⁻² for HER with a Tafel slope of 155&#xa0;mV.dec⁻¹. These results demonstrate the rational design of copper cobalt spinel oxide materials with sulfidated-MXene in the water splitting reaction. This approach paves the way for the development of cost-effective, high-performance electrocatalysts tailored for sustainable energy applications.</p>