title: Double perovskites as a family of highly active catalysts for oxygen evolution in alkaline solution.
abstract: The electronic structure of transition metal oxides governs the catalysis of many central reactions for energy storage applications such as oxygen electrocatalysis. Here we exploit the versatility of the perovskite structure to search for oxide catalysts that are both active and stable. We report double perovskites (Ln₀.₅Ba₀.₅)CoO(₃-δ) (Ln=Pr, Sm, Gd and Ho) as a family of highly active catalysts for the oxygen evolution reaction upon water oxidation in alkaline solution. These double perovskites are stable unlike pseudocubic perovskites with comparable activities such as Ba₀.₅Sr₀.₅Co₀.₈Fe₀.₂O(₃-δ) which readily amorphize during the oxygen evolution reaction. The high activity and stability of these double perovskites can be explained by having the O p-band centre neither too close nor too far from the Fermi level, which is computed from ab initio studies.
authors.affiliation: Electrochemical Energy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Alexis
authors.initials: A
authors.lastname: Grimaud
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: May
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Carlton
authors.forename: Yueh-Lin
authors.initials: YL
authors.lastname: Lee
authors.forename: Marcel
authors.initials: M
authors.lastname: Risch
authors.forename: Wesley T
authors.initials: WT
authors.lastname: Hong
authors.forename: Jigang
authors.initials: J
authors.lastname: Zhou
authors.forename: Yang
authors.initials: Y
authors.lastname: Shao-Horn