Assessment of Biochar Produced by Flame-Curtain Pyrolysis as a Precursor for the Development of an Efficient Electric Double-Layer Capacitor

Energies

Shion Tsuchiya¹  Toshiki Tsubota¹  Tatsuya Kusumoto¹  Dimitrios Kalderis² 

[1] Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata-ku, Kitakyushu 804-8550, Japan;Department of Electronic Engineering, School of Engineering, Hellenic Mediterranean University, Chania, 73100 Crete, Greece;

关键词: flame-curtain pyrolysis;    biochar;    activated carbon;    electric double-layer capacitor;    energy storage;   

DOI  :  10.3390/en14227671

来源: DOAJ

【 摘 要 】

Pine tree biochar produced by flame-curtain pyrolysis, an inexpensive and simple pyrolysis methodology, was used as the starting material for KOH-activated carbon. Flame-curtain pyrolysis is a simple, low-technology methodology that can be performed by non-specialized personnel. The elemental analysis of the biochars highlighted the high reproducibility of the process. The N₂ adsorption isotherms indicated that KOH activation was effective for the preparation of high-surface-area activated carbons from the biochar. The BET specific surface area increased with the quantity of KOH added in the activation process, achieving a maximum value of 3014 m² g⁻¹ at 85.7 wt.% of KOH addition. The adsorption isotherms of all samples were IUPAC type I, establishing their microporous nature. Results from the Mikhail–Brunauer (MP) method and α_s plot indicated that the pore size distribution became wider and the pore volume increased as the KOH content increased. The measured capacitance values followed the same dependence on KOH content. The maximum capacitance value at 1 mV s⁻¹ was determined as 200.6 F g⁻¹ for the sample prepared at 75 wt.% of KOH addition. Therefore, pine tree biochar prepared by simple pyrolysis equipment is a suitable precursor for the development of an electric double-layer capacitor.

【 授权许可】

Unknown