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/cm(2), and similar to 1 Omega 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.