title: Enhancing Cycling Stability of Aqueous Polyaniline Electrochemical Capacitors.
abstract: Electrochemical capacitors fabricated with polyaniline nanofibers are cycled 150 000 times with 98% capacitance retention. These devices maintain an energy density of 11.41 Wh/kg at a power density of 4000 W/kg, 64 times greater than that of an identically fabricated device based on activated carbon (0.177 Wh/kg at 4600 W/kg). For applications requiring a higher specific energy, 33.39 Wh/kg at a specific power of 600 W/kg is obtained by widening the voltage window; this device retains 93% capacitance after 10 000 cycles. We achieve a high cycling stability through careful device engineering paired with a renewed focus on the electrochemical processes occurring at the positive and negative electrodes during cycling.
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Luciano M
authors.initials: LM
authors.lastname: Santino
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Shinjita
authors.initials: S
authors.lastname: Acharya
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Liana
authors.initials: L
authors.lastname: Bloom
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Daniel
authors.initials: D
authors.lastname: Cotton
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Aly
authors.initials: A
authors.lastname: Wayne
authors.affiliation: Department of Chemistry and ‡Institute of Materials Science & Engineering, Washington University in St. Louis , St. Louis, Missouri 63130, United States.
authors.forename: Julio M
authors.initials: JM
authors.lastname: D'Arcy
keywords: EDLC; PANi; conducting polymers; doping; energy storage; poly(lactic acid); pseudocapacitance; supercapacitors