Fe<inf>3</inf>O<inf>4</inf>@NiFe<inf>x</inf>O<inf>y</inf> Nanoparticles with Enhanced Electrocatalytic Properties for Oxygen Evolution in Carbonate Electrolyte

Zhishan Luo, Sara Martí-Sànchez, Raquel Nafria, Gihan Joshua, Maria De La Mata, Pablo Guardia, Cristina Flox, Carlos Martínez-Boubeta, Konstantinos Simeonidis, Jordi Llorca, Joan Ramon Morante, Jordi Arbiol, Maria Ibáñez, Andreu Cabot

    Research output: Contribution to journalArticleResearchpeer-review

    29 Citations (Scopus)


    © 2016 American Chemical Society. 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.
    Original languageEnglish
    Pages (from-to)29461-29469
    JournalACS Applied Materials & Interfaces
    Issue number43
    Publication statusPublished - 2 Nov 2016


    • OER
    • core-shell nanostructure
    • electrocatalysts
    • iron oxide
    • magnetite
    • nanoparticle
    • oxygen evolution reaction


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