Ruthenium modified defatted spent coffee catalysts for supercapacitor and methanolysis application

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 N2 adsorption‐desorption, X‐ray diffraction, X‐ray photoelectron spectroscopy, and H2‐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°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°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.

Electrochemical performance of Quercus infectoria as a supercapacitor carbon electrode material

“…Basically, the activated carbon preparation method, the type of biomass support material, the activating agent, the type of electrolyte used, the temperature at which the biomass is burned, and the additive are effective on the capacitance values of the electrodes to be produced. In the literature, many supercapacitors have been designed using many biomass such as corn stalk, 18 lotus stem, 25 pomegranate peel, 26 tea factory waste, 27 pine cone biomass, 28 palm kernel shells, 29 loofah sponge, 30 and defatted spent coffee 31 . Considering the results, it is thought that especially Qui‐pure and Qui‐KOH materials will gain popularity in electrical energy storage, thanks to their stable structures and high capacities.…”

“…In the literature, many supercapacitors have been designed using many biomass such as corn stalk, 18 lotus stem, 25 pomegranate peel, 26 tea factory waste, 27 pine cone biomass, 28 palm kernel shells, 29 loofah sponge, 30 and defatted spent coffee. 31 Considering the results, it is thought that especially Qui-pure and Qui-KOH materials will gain popularity in electrical energy storage, thanks to their stable structures and high capacities.…”

New bifunctional carbon material of metal‐free pomegranate peel catalyst and supercapacitor for highly efficient hydrogen production and energy storage

“…As an example of some biomass supercapacitors in previous studies, while the capacitance of biopolymer electrodes prepared with corn starch containing lithium acetate and glycerol was calculated as 33 F/g by Shukur et al, 72 Teog et al 70 calculated the capacitance of polymer electrodes prepared with corn starch containing lithium perchlorate and barium as 16.22 F/g. In another study, Akdemir et al 74 prepared the ruthenium material supported by defatted spent coffee ground and examined both the catalytic activity of sodium boron hydride in the methanolysis reaction and calculated the capacitance of the electrodes as 43 F/g by measuring the supercapacitor of this material. Finally, Inal et al 39 investigated the catalytic activity of Microcystis aeruginosa microalgae supported manganese material in the methanolysis reaction of sodium boron hydride, and they calculated the capacitance of the electrodes as 40 F/g by measuring the supercapacitor of this material.…”

“…Hence, together with catalyst studies, a super capacitor was developed to determine the energy storage capacity of the material used. By the way, this material was named as cap‐cat in the literature 38‐41 …”

Synthesis of a dual‐functionalized carbon‐based material as catalyst and supercapacitor for efficient hydrogen production and energy storage: Pd‐supported pomegranate peel

“…In our previous studies, we have shown that carbon materials named as "cap-cat" (capacitor-catalyst) can be used multi-functionally as both catalyst material and supercapacitor material. 35,36 In this context, a supercapacitor cell was prepared by using PP-H 3 PO 4 -Pd catalyst as the electrode material by a twoelectrode system.…”