SANAM SHAFIQUE2025-12-082025-12-082023https://escholar.umt.edu.pk/handle/123456789/15536Hydrogen is a sustainable, eco-friendly, and renewable energy source. Transition metal sulfides incorporated with sulfur doped graphitic carbon nitride (S-g-C3N4) play a vital role in the research of renewable energy resources due to their incredible catalytic activity in water splitting for hydrogen and oxygen evolution reaction, (HER) and (OER) respectively. Here, we designed a highly efficient nanomaterial of Mn-doped cobalt sulfide composite with S-g-C3N4 (Mn/CoS@S-g-C3N4) with superior electrocatalytic activity for water splitting by using a simple co-precipitation method at lower temperature and less time consumption. The electrocatalyst was characterized using the techniques of SEM, EDX, FTIR, and XRD to examine its structure, size, and morphology. Doping and the production of composite materials boost the electrochemical water splitting activity, according to LSV, CV, EIS, and Chronopotentiometry. Three electrode system was used to study the activity of the synthesized electrocatalyst, it was used as a working electrode and exhibited a lower value of overpotential 306 mV for OER and 404 mV HER at 10 mA/cm2 current density in 1 M KOH solution. Moreover, the bifunctional electrocatalyst required less cell potential in an alkaline solution, a remarkable value of Tafel slope, and excellent electrocatalytic activity towards both OER and HER. Results indicated that synthesized electrocatalysts have potential applications for the generation of sustainable energy through water splitting.enThesis