TY - JOUR
T1 - Solution-plasma treatment of activated carbon from shochu distillery waste for electrochemical capacitors
AU - Tashima, Daisuke
AU - Hirano, Masaki
AU - Kitazaki, Satoshi
AU - Eguchi, Takuya
AU - Kumagai, Seiji
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - In this study, activated carbon was prepared from shochu (Japanese distilled liquor) waste for use as an electrode material in electric double-layer capacitors (EDLCs). To increase the capacitance and energy density, the activated carbon was subjected to a solution-plasma surface treatment using a DC power source. The plasma was generated in the gas phase of the electrolyte. The optimal treatment conditions were determined by varying the applied voltage, treatment time, and electrolyte. After treatment at 240 V in potassium hydroxide (KOH) solution, the capacitance of the EDLC increased by 11.7%, while its internal resistance reduced by 31.8%. Infrared spectrometry was performed on the surface-treated activated carbon samples. The spectra confirmed the presence of oxygen-containing functional groups, such as –COO groups and C[dbnd]O bonds. Thus, the observed increase in the capacitance was attributed to an increase in the surface wettability of the material, along with the appearance of pseudocapacitance.
AB - In this study, activated carbon was prepared from shochu (Japanese distilled liquor) waste for use as an electrode material in electric double-layer capacitors (EDLCs). To increase the capacitance and energy density, the activated carbon was subjected to a solution-plasma surface treatment using a DC power source. The plasma was generated in the gas phase of the electrolyte. The optimal treatment conditions were determined by varying the applied voltage, treatment time, and electrolyte. After treatment at 240 V in potassium hydroxide (KOH) solution, the capacitance of the EDLC increased by 11.7%, while its internal resistance reduced by 31.8%. Infrared spectrometry was performed on the surface-treated activated carbon samples. The spectra confirmed the presence of oxygen-containing functional groups, such as –COO groups and C[dbnd]O bonds. Thus, the observed increase in the capacitance was attributed to an increase in the surface wettability of the material, along with the appearance of pseudocapacitance.
KW - Activated carbon
KW - Electric double-layer capacitor
KW - Solution-plasma treatment
UR - http://www.scopus.com/inward/record.url?scp=85087589566&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2020.123523
DO - 10.1016/j.matchemphys.2020.123523
M3 - Article
AN - SCOPUS:85087589566
SN - 0254-0584
VL - 254
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 123523
ER -