High-frequency electrochemical capacitors based on plasma pyrolyzed bacterial cellulose aerogel for current ripple filtering and pulse energy storage

Through microbe fermentation process, cellulose nanofiber aerogel was synthesized, which was converted to crosslinked carbon nanofiber aerogel in a rapid plasma pyrolysis process. Using such highly conductive carbon aerogel with large surface area and tailed porous structure, kilohertz high-frequency electrochemical capacitors (HF-EC) with large areal capacitance as high as 4.5 mF cm−2 at 120 Hz were demonstrated. HF-ECs operated at 3 V were further demonstrated for pulse energy storage in environmental noise energy harvesting system for the first time.231