title: Correlating Oxygen Evolution Catalysts Activity and Electronic Structure by a High-Throughput Investigation of Ni1-y-zFeyCrzOx.
abstract: High-throughput characterization by soft X-ray absorption spectroscopy (XAS) and electrochemical characterization is used to establish a correlation between electronic structure and catalytic activity of oxygen evolution reaction (OER) catalysts. As a model system a quasi-ternary materials library of Ni1-y-zFeyCrzOxwas synthesized by combinatorial reactive magnetron sputtering, characterized by XAS, and an automated scanning droplet cell. The presence of Cr was found to increase the OER activity in the investigated compositional range. The electronic structure of NiIIand CrIIIremains unchanged over the investigated composition spread. At the Fe L-edge a linear combination of two spectra was observed. These spectra were assigned to FeIIIin Ohsymmetry and FeIIIin Tdsymmetry. The ratio of FeIIIOhto FeIIITdincreases with the amount of Cr and a correlation between the presence of the FeIIIOhand a high OER activity is found.
authors.affiliation: Operando Characterization of Solar Fuel Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Schwanke
authors.affiliation: Chair for MEMS Materials, Institute for Materials, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany.
authors.forename: Helge Sören
authors.initials: HS
authors.lastname: Stein
authors.affiliation: Operando Characterization of Solar Fuel Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
authors.forename: Lifei
authors.initials: L
authors.lastname: Xi
authors.affiliation: Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, 44780 BochumGermany.
authors.forename: Kirill
authors.initials: K
authors.lastname: Sliozberg
authors.affiliation: Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-University Bochum, Universitätsstr. 150, 44780 BochumGermany.|Materials Research Department, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schuhmann
authors.affiliation: Chair for MEMS Materials, Institute for Materials, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany.|Materials Research Department, Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum Germany.
authors.forename: Alfred
authors.initials: A
authors.lastname: Ludwig
authors.affiliation: Operando Characterization of Solar Fuel Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.|Universität Bielefeld, Physikalische Chemie, Universitätsstr. 25, D-33615 Bielefeld, Germany.
authors.forename: Kathrin M
authors.initials: KM
authors.lastname: Lange