Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte

Biegun, Marcin; Dymerska, Anna; Chen, Xuecheng; Mijowska, Ewa

doi:10.3390/ma13183919

Open AccessArticle

Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte

Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065 Szczecin, Poland

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Author to whom correspondence should be addressed.

Materials 2020, 13(18), 3919; https://doi.org/10.3390/ma13183919

Submission received: 9 August 2020 / Revised: 1 September 2020 / Accepted: 2 September 2020 / Published: 4 September 2020

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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

^{\circ} C

. 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

2906 \pm 19

m

^{2}

g^{- 1}

. 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

^{\circ} C

. The specific material capacitance reached 178

F

g^{- 1}

measured at 20

^{\circ} C

and 50 A

g^{- 1}

and was in the range 182 to 285

F

g^{- 1}

at the 20 to 120

^{\circ} C

temperature range.

Keywords: biochar; supercapacitor; ionic liquid

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MDPI and ACS Style

Biegun, M.; Dymerska, A.; Chen, X.; Mijowska, E. Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte. Materials 2020, 13, 3919. https://doi.org/10.3390/ma13183919

AMA Style

Biegun M, Dymerska A, Chen X, Mijowska E. Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte. Materials. 2020; 13(18):3919. https://doi.org/10.3390/ma13183919

Chicago/Turabian Style

Biegun, Marcin, Anna Dymerska, Xuecheng Chen, and Ewa Mijowska. 2020. "Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte" Materials 13, no. 18: 3919. https://doi.org/10.3390/ma13183919

APA Style

Biegun, M., Dymerska, A., Chen, X., & Mijowska, E. (2020). Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte. Materials, 13(18), 3919. https://doi.org/10.3390/ma13183919

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Study of the Active Carbon from Used Coffee Grounds as the Active Material for a High-Temperature Stable Supercapacitor with Ionic-Liquid Electrolyte

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