title: Efficient Charge Storage in Dual-Redox Electrochemical Capacitors through Reversible Counterion-Induced Solid Complexation.
abstract: The performance of redox-enhanced electrochemical capacitors (redox ECs) is substantially improved when oxidized catholyte (bromide) and reduced anolyte (viologen) are retained within the porous electrodes through reversible counterion-induced solid complexation. Investigation of the mechanism illustrates design principles and identifies pentyl viologen/bromide (PV/Br) as a new high-performance electrolyte. The symmetric PV/Br redox EC produces a specific energy of 48.5 W·h/kgdry at 0.5 A/gdry (0.44 kW/kgdry) with 99.7% Coulombic efficiency, maintains stability over 10 000 cycles, and functions identically when operated with reversed polarity.
authors.affiliation: Materials Department, University of California , Santa Barbara, California 93106, United States.
authors.forename: Brian
authors.initials: B
authors.lastname: Evanko
authors.affiliation: Department of Chemistry & Biochemistry, University of California , Santa Barbara, California 93106, United States.
authors.forename: Seung Joon
authors.initials: SJ
authors.lastname: Yoo
authors.affiliation: School of Materials Science and Engineering, Kyungpook National University , Daegu 41566, Republic of Korea.
authors.forename: Sang-Eun
authors.initials: SE
authors.lastname: Chun
authors.affiliation: Department of Chemistry, Oregon State University , Corvallis, Oregon 97331, United States.
authors.forename: Xingfeng
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Oregon State University , Corvallis, Oregon 97331, United States.
authors.forename: Xiulei
authors.initials: X
authors.lastname: Ji
authors.affiliation: Department of Chemistry & Biochemistry, University of Oregon , Eugene, Oregon 97403, United States.
authors.forename: Shannon W
authors.initials: SW
authors.lastname: Boettcher
authors.affiliation: Materials Department, University of California , Santa Barbara, California 93106, United States.|Department of Chemistry & Biochemistry, University of California , Santa Barbara, California 93106, United States.
authors.forename: Galen D
authors.initials: GD
authors.lastname: Stucky