MXene based electrocatalyst: CoS2@Ti3C2Tx composite for hydrogen evolution reaction in alkaline media

The worldwide need for hydrogen (H2) fuel generation through electrolysis is significant. The challenge of selecting a suitable electrocatalytic material, on the other hand, is highly complicated, since it involves discovering a stable, cost-effective choice that is widely accessible. Non-noble metal-based electrocatalysts are being studied for their potential to display attractive electrochemical water splitting (EWS) behaviour especially in alkaline media. Researchers are evaluating their ability to provide increased electrical conductivity, reduced overpotential, and greater density, which are all required for practical implementation. Herein, we present wet chemical-based synthesized MXene (Ti3C2Tx) incorporated cobalt-sulfide (CoS2) electrocatalyst for hydrogen evolution reaction (HER) in alkaline medium. As-prepared catalyst shows; very low overpotential value (286 mV) to reach 20 mA/cm2 current density, lower Tafel slope value of 78 mV/dec, higher electrochemical surface area (ECSA) 495 cm2, as well as a lower charge transfer resistance (Rct) value of 115 Ω. Such electrochemical features support this composition as a novel and robust electrocatalyst for HER toward its practical usage for energy storage and conversion systems.