Abstract
This study reveals a simple approach to recycle wasted coffee grounds into highly valuable carbon material with superior electrochemical performance. Activated carbon prepared from wasted coffee grounds has been formed via hydrothermal acidic hydrolysis followed by a KOH chemical activation at 800 . To understand the electrochemical properties of the sample, a set of characterization tools has been utilized: N2 and CO2 adsorption–desorption isotherms, thermal gravimetric analysis, Fourier transform infrared spectroscopy, Raman spectroscopy and scanning electron microscopy. The specific surface area obtained from a Brunner–Emmett–Teller (BET) analysis reached . Prepared sample (designated as ACG-800KOH) was tested as electrode material in an electric double layer capacitor (EDLC) device with ionic liquid PYR13-TFSI as an electrolyte. The EDLC test was conducted at temperatures ranging from 20 to 120 . The specific material capacitance reached 178 measured at 20 and 50 A and was in the range 182 to 285 at the 20 to 120 temperature range.
Highlights
Research on Electric/Electrochemical Double Layer Capacitors (EDLC), commonly calledSupercapacitors, is still a key area especially in times of intensive popularization of electric vehicles around the world
Potassium hydroxide works by creating micropores and fewer mesopores as a result of the oxidation of the carbon structure, according to chemical Equations (1)–(3) [34,35]
In order to determine the performance of the obtained carbon material as an electrode material, it was tested in a two-electrode electric double layer capacitor (EDLC) system with PYR13-TFSI as the electrolyte
Summary
Research on Electric/Electrochemical Double Layer Capacitors (EDLC), commonly called. In EDLC types with active carbon material, the first group consists of aqueous solutions of bases, acids or salts such as 1 M KOH, 1 M H2 SO4 , 0.5 M Na2 SO4 , 1 M LiCl [9] and others. Certain solutions can be application of Room Temperature Ionic Liquids RTIL [17] They are non-flammable [18] and can be tested in specific applications by appropriate selection of cation and anion components [19]. It is an interesting hydrophobic type of ionic liquid due to its wide potential stability window and is currently available in decent purity from several suppliers [22,32]
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