Bifunctional CuS/Cl-terminated greener MXene electrocatalyst for efficient hydrogen production by water splitting.

Metal sulfides and 2D materials are the propitious candidates for numerous electrochemical applications, due to their superior conductivity and ample active sites. Herein, CuS nanoparticles were fabricated on 2D greener HF-free Cl-terminated MXene (Ti 3 C 2 Cl 2 ) sheets by the hydrothermal process as a proficient electrocatalyst for the hydrogen evolution reaction (HER) and overall water splitting. CuS/Ti 3 C 2 Cl 2 showed an overpotential of 163 mV and a Tafel slope of 77 mV dec -1 at 10 mA cm -2 for the HER. In the case of the OER, CuS/Ti 3 C 2 Cl 2 exhibited an overpotential of 334 mV at 50 mA cm -2 and a Tafel slope of 42 mV dec -1 . Moreover, the assembled CuS/Ti 3 C 2 Cl 2 ||CuS/Ti 3 C 2 Cl 2 electrolyzer delivered current density of 20 mA cm -2 at 1.87 V for overall water splitting. The CuS/Ti 3 C 2 Cl 2 electrocatalyst showed excellent stability to retain 96% of its initial value for about 48 hours at 100 mA cm -2 current density. The synthesis of CuS/Ti 3 C 2 Cl 2 enriches the applications of MXene/metal sulfides in efficient bifunctional electrocatalysis for alkaline water splitting.