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Activated Carbon Derived from Wood Biochar and Its Application in Supercapacitors

TitleActivated Carbon Derived from Wood Biochar and Its Application in Supercapacitors
Publication TypeJournal Article
Year of Publication2013
AuthorsKoutcheiko, S., and Vorontsov V.
JournalJournal of Biobased Materials and Bioenergy

The work described in this paper was performed to evaluate a potential application of the value-added biochar-derived activated carbon as an electrode material for supercapacitor manufacturing and to measure the electrochemical characteristics of fabricated single and stack coin supercapacitors. Physico-chemical characterization of raw material and economically-attractive physical activation (CO2 and CO2 saturated with 3% H2O) were used to produce activated carbon with suitable parameters. Optimization of activation conditions (temperature, duration, gaseous environment) allowed production of activated carbon with a high surface area (BET) up to 1500 m2/g and iodine number up to 1200 mg/g. The most promising activated carbon was used for supercapacitor electrode fabrication. A dip-coating method was developed and utilized to prepare the large 10 × 10 cm electrode sheets based on Ni-foam as a support. For electrochemical characterization a batch of single coin cells (based on commercially available 2032 design/size factor) utilizing inexpensive aqueous electrolyte K/LiOH 5 M was fabricated and tested by a number of industry-accepted methods for the electrochemical performance evaluation. Based on a single cell design a stack with operating voltage of 4.5 V was assembled and evaluated.