title: Synergistic Effect of Cobalt and Iron in Layered Double Hydroxide Catalysts for the Oxygen Evolution Reaction.
abstract: Co-based layered double hydroxide (LDH) catalysts with Fe and Al contents in the range of 15 to 45 at % were synthesized by an efficient coprecipitation method. In these catalysts, Fe3+or Al3+ions play an essential role as trivalent species to stabilize the LDH structure. The obtained catalysts were characterized by a comprehensive combination of surface- and bulk-sensitive techniques and were evaluated for the oxygen evolution reaction (OER) on rotating disk electrodes. The OER activity decreased upon increasing the Al content for the Co- and Al-based LDH catalysts, whereas a synergistic effect in Co- and Fe-based LDHs was observed, which resulted in an optimal Fe content of 35 at %. This catalyst was spray-coated on Ni foam electrodes and showed very good stability in a flow-through cell with a potential of approximately 1.53 V at 10 mA cm-2in 1 m KOH for at least 48 h.
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Fengkai
authors.initials: F
authors.lastname: Yang
authors.affiliation: Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Kirill
authors.initials: K
authors.lastname: Sliozberg
authors.affiliation: Department of Physics, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Ilya
authors.initials: I
authors.lastname: Sinev
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Hendrik
authors.initials: H
authors.lastname: Antoni
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Bähr
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Kevin
authors.initials: K
authors.lastname: Ollegott
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Wei
authors.initials: W
authors.lastname: Xia
authors.affiliation: Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Justus
authors.initials: J
authors.lastname: Masa
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Grünert
authors.affiliation: Department of Physics, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Beatriz Roldan
authors.initials: BR
authors.lastname: Cuenya
authors.affiliation: Analytical Chemistry and Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schuhmann
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, D-44780, Germany.
authors.forename: Martin
authors.identifier: http://orcid.org/0000-0001-5343-6922
authors.initials: M
authors.lastname: Muhler
mesh_terms: D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D006878:Hydroxides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature
chemical_list: D006878:Hydroxides; D003035:Cobalt; D007501:Iron; D010100:Oxygen
keywords: cobalt; iron; layered double hydroxides; oxygen evolution reaction; stability