Ruthenium modified defatted spent coffee catalysts for supercapacitor and methanolysis application


Akdemir M., Hansu T. A. , Çağlar A., Kaya M., Demir Kıvrak H.

ENERGY STORAGE, vol.3, no.4, 2021 (Journal Indexed in ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 3 Issue: 4
  • Publication Date: 2021
  • Doi Number: 10.1002/est2.243
  • Title of Journal : ENERGY STORAGE
  • Keywords: green ground defatted spent coffee, methanolysis, ruthenium, sodium borohydride, supercapacitor, HIERARCHICAL POROUS CARBON, ACTIVATED CARBON, HYDROGEN-PRODUCTION, WASTE, ACID, ELECTROLYTES, CAPACITANCE, GRAPHENE, AREA

Abstract

Currently, 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.