Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 43, Pages 29461-29469Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09888
Keywords
nanoparticle; iron oxide; magnetite; core-shell nanostructure; electrocatalysts; oxygen evolution reaction; OER
Funding
- European Regional Development Funds
- Spanish MINECO
- TNT-FUELS
- Severo Ochoa Program (MINECO) [SEV-2013-0295]
- PEC-CO2
- China Scholarship Council
- European Union [600388]
- Agency for Business Competitiveness of the Government of Catalonia, ACCIO
- AGAUR [2013 BP-A00344]
- Programa Internacional de Becas la Caixa-Severo Ochoa
- Generalitat de Catalunya [2014 SGR 1638]
- ICREA Funding Source: Custom
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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/cm(2) with a 410 mV overpotential and Tafel slopes of 48 mV/dec, which is among the best electrocatalytic performances reported in carbonate electrolyte.
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