Improvement of the sluggish kinetics of the overall water splitting catalyst through N-doping and the formation of carbon shell makes it possible to achieve carbon neutrality, and to synthesize a...
We
report successfully synthesizing two-dimensional (2D) and nanocrystalline
(NC) Fe2Ni2N/rGO nanohybrid sheets (NHSs) via
ammonolysis of as-prepared 2D Ni2.25Fe0.75[Fe(CN)6]2/rGO precursors. We compared the electrochemical
properties of the 2D-NC Fe2Ni2N/rGO NHSs as
non-precious-metal nitride and graphene nanohybrid electrocatalysts
for an oxygen evolution reaction (OER) with those of NiFe-based composition.
The overpotential and Tafel plot of the 2D-NC Fe2Ni2N/rGO NHSs had their lowest values of 290 and 49.1 mV dec–1, respectively, at a current density of 10 mA cm–2 (0.1 M, KOH). The 2D-NC Fe2Ni2N/rGO NHS catalyst was stable under OER conditions, and X-ray photoelectron
spectroscopy and scanning transmission electron microscopy confirmed
the stability of the catalysts after electrochemical testing (24 h).
The synergistic interactions between the transition-metal nitride
and graphene represent unique 2D nanostructured, metallic properties,
and graphene sheets with nanocrystalline Fe2Ni2N on them are significantly more efficient and active electrocatalysts.
The presented strategy of transition-metal nitride/graphene hybrid
nanostructures provides potential for more efficient and outstanding
OER electrocatalysts.
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