1 research outputs found
Fe<sub>3</sub>O<sub>4</sub>@NiFe<sub><i>x</i></sub>O<sub><i>y</i></sub> Nanoparticles with Enhanced Electrocatalytic Properties for Oxygen Evolution in Carbonate Electrolyte
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 Fe<sub>3</sub>O<sub>4</sub>@NiFe<sub><i>x</i></sub>O<sub><i>y</i></sub> 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 Fe<sub>3</sub>O<sub>4</sub> nanocubes with
a defective shell and the posterior diffusion of nickel cations within
this defective shell. Fe<sub>3</sub>O<sub>4</sub>@NiFe<sub><i>x</i></sub>O<sub><i>y</i></sub> NPs were subsequently
spin-coated over ITO-covered glass and their electrocatalytic activity
toward water oxidation in carbonate electrolyte was characterized.
Fe<sub>3</sub>O<sub>4</sub>@NiFe<sub><i>x</i></sub>O<sub><i>y</i></sub> catalysts reached current densities above
1 mA/cm<sup>2</sup> with a 410 mV overpotential and Tafel slopes of
48 mV/dec, which is among the best electrocatalytic performances reported
in carbonate electrolyte