Akdemir, MuratHansu, Tulin AvciCaglar, AykutKaya, MustafaKivrak, Hilal Demir2025-05-102025-05-1020212578-486210.1002/est2.243https://doi.org/10.1002/est2.243https://hdl.handle.net/20.500.14720/7315Kaya, Mustafa/0000-0002-0622-3163; Akdemir, Murat/0000-0001-9235-1913; Avci Hansu, Tulin/0000-0001-5441-4696; Kivrak, Hilal/0000-0001-8001-7854Currently, a novel green material, defatted spent coffee ground (DSCG), is employed as a support to prepare DSCG supported Ru (DSCG-Ru) material. DSCG and DSCG-Ru materials are characterized by advanced surface analytical techniques such as N-2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and H-2-temperature-programmed reduction. Characterization results revealed that DSCG-Ru was prepared successfully. First, DSCG-Ru is prepared at varying Ru contents on deoiled coffee waste and hydrogen production experiments are performed by the methanolysis of sodium borohydride on the DSCG-Ru catalysts. It is observed that optimum conditions for the catalyst preparation are examined on the 10% Ru containing DSCG-Ru catalysts and found as 10% Ru, 300 degrees C, and 60 minutes. DSCG catalyst containing 10% Ru completed the methanolysis reaction in 1.5 minutes. Capacitive measurements to investigate the supercapacitor property of DSCG-Ru catalysts prepared at optimum conditions 10% Ru, 300 degrees C, and 60 minutes is investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge measurements. Results revealed that gravimetric capacitance of the electrode at a current density is found as of 0.5 A/g and 43 F/g, greater than the literature values. DSCG-Ru, green novel supported Ru catalyst, has a dual promising performance in hydrogen production and supercapacitor measurements.eninfo:eu-repo/semantics/closedAccessGreen Ground Defatted Spent CoffeeMethanolysisRutheniumSodium BorohydrideSupercapacitorArticle34N/AQ3WOS:000647689100001