title: Anion charge storage through oxygen intercalation in LaMnO3 perovskite pseudocapacitor electrodes.
abstract: Perovskite oxides have attracted significant attention as energy conversion materials for metal-air battery and solid-oxide fuel-cell electrodes owing to their unique physical and electronic properties. Amongst these unique properties is the structural stability of the cation array in perovskites that can accommodate mobile oxygen ions under electrical polarization. Despite oxygen ion mobility and vacancies having been shown to play an important role in catalysis, their role in charge storage has yet to be explored. Herein we investigate the mechanism of oxygen-vacancy-mediated redox pseudocapacitance for a nanostructured lanthanum-based perovskite, LaMnO3. This is the first example of anion-based intercalation pseudocapacitance as well as the first time oxygen intercalation has been exploited for fast energy storage. Whereas previous pseudocapacitor and rechargeable battery charge storage studies have focused on cation intercalation, the anion-based mechanism presented here offers a new paradigm for electrochemical energy storage.
authors.affiliation: 1] Department of Chemistry, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [2].
authors.forename: J Tyler
authors.initials: JT
authors.lastname: Mefford
authors.affiliation: 1] Texas Materials Institute, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [2].
authors.forename: William G
authors.initials: WG
authors.lastname: Hardin
authors.affiliation: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: Sheng
authors.initials: S
authors.lastname: Dai
authors.affiliation: 1] Texas Materials Institute, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [2] Department of Chemical Engineering, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [3] Center for Electrochemistry, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA.
authors.forename: Keith P
authors.initials: KP
authors.lastname: Johnston
authors.affiliation: 1] Department of Chemistry, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [2] Texas Materials Institute, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA [3] Center for Electrochemistry, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA.
authors.forename: Keith J
authors.initials: KJ
authors.lastname: Stevenson