title: Influence of iron doping on tetravalent nickel content in catalytic oxygen evolving films.
abstract: Iron doping of nickel oxide films results in enhanced activity for promoting the oxygen evolution reaction (OER). Whereas this enhanced activity has been ascribed to a unique iron site within the nickel oxide matrix, we show here that Fe doping influences the Ni valency. The percent of Fe3+doping promotes the formation of formal Ni4+, which in turn directly correlates with an enhanced activity of the catalyst in promoting OER. The role of Fe3+is consistent with its behavior as a superior Lewis acid.
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.
authors.forename: Nancy
authors.initials: N
authors.lastname: Li
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.
authors.forename: D Kwabena
authors.initials: DK
authors.lastname: Bediako
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439.
authors.forename: Ryan G
authors.initials: RG
authors.lastname: Hadt
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439.
authors.forename: Dugan
authors.initials: D
authors.lastname: Hayes
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Kempa
authors.affiliation: Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138.
authors.forename: Felix
authors.initials: F
authors.lastname: von Cube
authors.affiliation: Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138.
authors.forename: David C
authors.initials: DC
authors.lastname: Bell
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439.|Department of Chemistry, Northwestern University, Evanston, IL 60208.
authors.forename: Lin X
authors.initials: LX
authors.lastname: Chen
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138; dnocera@fas.harvard.edu.
authors.forename: Daniel G
authors.initials: DG
authors.lastname: Nocera
keywords: catalysis; electrocatalysis; oxygen evolution reaction; renewable energy; water splitting