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(487h) Corn Stover-Derived Biocarbon from Hydrothermal Liquefaction for Supercapacitor Applications

Shell, K. - Presenter, Virginia Commonwealth University
Amar, V. S., South Dakota School of Mines and Technology
Rodene, D., Virginia Commonwealth University
Thakkar, A., Old Dominion University
Maddipudi, B., South Dakota School of Mines and Technology
Kumar, S., Old Dominion University
Shende, R., South Dakota School of Mines and Technology
Gupta, R. B., Virginia Commonwealth University
Biocarbon for supercapacitor anodes has become a frontrunner for renewable energy storage materials. Its unique physical characteristics allow for enhanced rate capabilities, increased ion transport, all leading to sustainable scale-up. Current work focuses on the use carbon-rich residue from the corn stover refining. Value added chemicals were first extracted by enzymatic hydrolysis, and the resultant lignin-rich unhydrolyzed solids (UHS) derived from preprocessing of corn stover were subjected to hydrothermal liquefaction (HTL). Bio-char samples derived from investigating the HTL reaction kinetics at various temperatures, initial purge, reaction time, and biomass loading, were subjected to thermal treatment at 400 °C under nitrogen for 2 h and followed by the activation at 850 °C under Ar for 3 h to obtain the biocarbon material. Electrochemical results show that select samples reach capacitances above 200 F g-1 at 5 mV s-1. Physical and electrochemical characterizations such as BET, XRD, SEM, and ATR-FTIR, Raman, cyclic voltammetry, and chronopotentiometry were carried out to fundamentally probe the biocarbon. This work provides an insight into how pretreatment conditions affects the performance of biocarbon for supercapacitor applications.