Fe3O4@NiFexOy nanoparticles with enhanced electrocatalytic properties for oxygen evolution in carbonate electrolyte Luo, Zhishan Márti Sánchez, Sara Nafria, Raquel Joshua, Gihan De La Mata, Maria Guardia, Pablo Flox, Christina Martínez Boubeta, Carlos Simeonidis, Konstantinos Llorca, Jordi Morante, Joan Arbiol, Jordi Ibanez Sabate, Maria ; https://orcid.org/0000-0001-5013-2843 Cabot, Andreu nanoparticle iron oxide magnetite core−shell nanostructure electrocatalysts oxygen evolution reaction OER The design and engineering of earth-abundant catalysts that are both cost-effective and highly active for water splitting are crucial challenges in a number of energy conversion and storage technologies. In this direction, herein we report the synthesis of Fe3O4@NiFexOy core-shell nanoheterostructures and the characterization of their electrocatalytic performance toward the oxygen evolution reaction (OER). Such nanoparticles (NPs) were produced by a two-step synthesis procedure involving the colloidal synthesis of Fe3O4 nanocubes with a defective shell and the posterior diffusion of nickel cations within this defective shell. Fe3O4@NiFexOy NPs were subsequently spin-coated over ITO-covered glass and their electrocatalytic activity toward water oxidation in carbonate electrolyte was characterized. Fe3O4@NiFexOy catalysts reached current densities above 1 mA/cm2 with a 410 mV overpotential and Tafel slopes of 48 mV/dec, which is among the best electrocatalytic performances reported in carbonate electrolyte. American Chemical Society 2016 info:eu-repo/semantics/article doc-type:Article Article http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/371 Luo Z, Márti Sánchez S, Nafria R, et al. Fe3O4@NiFexOy nanoparticles with enhanced electrocatalytic properties for oxygen evolution in carbonate electrolyte. <i>Applied Materials and Interfaces</i>. 2016;8(43):29461-29469. doi:<a href="https://doi.org/10.1021/acsami.6b09888">10.1021/acsami.6b09888</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsami.6b09888 info:eu-repo/semantics/altIdentifier/issn/1944-8244 info:eu-repo/semantics/altIdentifier/e-issn/1944-8252 info:eu-repo/semantics/altIdentifier/pmid/27730808 info:eu-repo/semantics/closedAccess