Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.206, 2026 (SCI-Expanded, Scopus)
This study aims to create stable, active, and reasonably priced electrocatalysts for the hydrogen evolution reaction (HER) by using activated carbon (AC) made from coffee waste as a support and incorporating Fe, Mo, and S as active phases. Activated carbons are prepared by applying different carbonization temperature and acid/base washing to optimize porosity and surface area. AC supported Fe–Mo catalysts at different mass percentages (5 % and 15 %) are prepared by wet impregnation method. These catalysts are then treated to sulfonation process to prepare AC supported Fe–Mo–S catalysts. Characterization studies confirm mesoporosity, morphology, and active phase integration. XPS analysis clearly indicates that the sulfonation process introduces multiple sulfur-containing functional groups onto the surface of the catalyst and this results the positive effect on electrochemical activity. 15Fe–15Mo–S@BA-AC(1/2)-A achieves a Tafel slope of 149 mV/dec, 303 mV overpotential at 10 mA/cm2, and ∼1 Ω resistance with good stability over 5000 cycles. A current density loss of 9.5 % was observed for 15Fe–15Mo–S@BA-AC(1/2)-A after 100 h of continuous measurement and this result demonstrates excellent durability.