Intermetallic Fe<sub>6</sub>Ge<sub>5</sub> formation and decay of a core–shell structure during the oxygen evolution reaction
J. Niklas Hausmann, Roman A. Khalaniya, Chittaranjan Das, Ina Remy-Speckmann, Stefan Berendts, Аndrei V. Shevelkov, Matthias Drieß, Prashanth W. Menezes
Abstract
Herein, we report on intermetallic iron germanide (Fe6Ge5) as a novel oxygen evolution reaction (OER) precatalyst with a Tafel slope of 32 mV dec-1 and an overpotential of 272 mV at 100 mA cm-2 in alkaline media. Furthermore, we uncover the in situ formation of a core-shell like structure that slowly collapses under OER conditions.
Topics & Concepts
IntermetallicShell (structure)Oxygen evolutionOxygenCore (optical fiber)Materials scienceOxygen atomCrystallographyChemistryChemical physicsPhysical chemistryMetallurgyMoleculeComposite materialElectrodeAlloyOrganic chemistryElectrochemistryElectrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization Studies