title: Spatially resolved mapping of oxygen reduction/evolution reaction on solid-oxide fuel cell cathodes with sub-10 nm resolution.
abstract: Spatial localization of the oxygen reduction/evolution reactions on lanthanum strontium cobaltite (LSCO) surfaces with perovskite and layered perovskite structures is studied at the sub-10 nm level. Comparison between electrochemical strain microscopy (ESM) and structural imaging by scanning transmission electron microscopy (STEM) suggests that small-angle grain boundaries act as regions with enhanced electrochemical activity. The ESM activity is compared across a family of LSCO samples, demonstrating excellent agreement with macroscopic behaviors. This study potentially paves the way for deciphering the mechanisms of electrochemical activity of solids on the level of single extended structural defects such as grain boundaries and dislocations.
authors.affiliation: Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States. amkum1in@gmail.com
authors.forename: Amit
authors.initials: A
authors.lastname: Kumar
authors.forename: Donovan
authors.initials: D
authors.lastname: Leonard
authors.forename: Stephen
authors.initials: S
authors.lastname: Jesse
authors.forename: Francesco
authors.initials: F
authors.lastname: Ciucci
authors.forename: Eugene A
authors.initials: EA
authors.lastname: Eliseev
authors.forename: Anna N
authors.initials: AN
authors.lastname: Morozovska
authors.forename: Michael D
authors.initials: MD
authors.lastname: Biegalski
authors.forename: Hans M
authors.initials: HM
authors.lastname: Christen
authors.forename: Alexander
authors.initials: A
authors.lastname: Tselev
authors.forename: Eva
authors.initials: E
authors.lastname: Mutoro
authors.forename: Ethan J
authors.initials: EJ
authors.lastname: Crumlin
authors.forename: Dane
authors.initials: D
authors.lastname: Morgan
authors.forename: Yang
authors.initials: Y
authors.lastname: Shao-Horn
authors.forename: Albina
authors.initials: A
authors.lastname: Borisevich
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Kalinin
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry; D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D007811:Lanthanum / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D007811:Lanthanum; D014025:Titanium; D010100:Oxygen