Comparison of the electrochemical properties of activated carbon prepared from woody biomass with different lignin content
2020
Choi, Jun-Ho | Kim, Jo-Eun | Lim, Geon Hae | Han, Joah | Roh, Kwang Chul | Lee, Jae-won
In this study, activated carbon was prepared from lignocellulosic biomass and its electrochemical properties were analyzed and compared. The highest total specific net energy efficiency was 1.12 kW/kg when the mixed softwood (MSW) was ground, while the value was as low as 0.54 kW/kg for logging residue (LOR). The lignin content ranged from 27.38 to 33.43% depending on the biomass type, and the value was the highest for LOR. The activated carbon was prepared by carbonization and activation with KOH. A partially graphitic structure was observed in the MSW by high-resolution transmission electron microscope, X-ray diffractometer, and X-ray photoelectron spectroscopy analyses. The activated carbon prepared from MSW and mixed hardwood showed higher specific surface areas (> 1832 m²/g) and micropore volume (> 0.69 cm³/g) than commercial activated carbon (1729 m²/g and 0.64 cm³/g). The gravimetric specific capacitance (17.1 F/cc) and the specific capacitance retention ratio of cycling stability (91.1%) properties were excellent in MSW. However, lignin content was not proportional to the improvement in electrochemical properties.
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