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Download fileNi–Fe Phosphate/Ni Foam Electrode: Facile Hydrothermal Synthesis and Ultralong Oxygen Evolution Reaction Durability
journal contribution
posted on 01.11.2019, 15:45 authored by Xiaolei Li, Qingqing Zha, Yonghong NiNickel–iron
phosphate film with a porous surface formed
by ultrathin nanotubes was successfully grown on Ni foam (NF) through
a simple hydrothermal route at 150 °C for 90 min in the presence
of HCl and urea with proper amounts, employing Fe(NO3)3·9H2O as the iron source, Na2HPO4 as the PO43– source, and NF
as the nickel source and the substrate. The as-obtained product (labeled
as NiFe-Pi/NF) was characterized by field-emission scanning electron
microscopy (FESEM), transmission electron microscopy (TEM), X-ray
powder diffraction (XRD), X-ray energy dispersive spectroscopy (EDS),
EDS mapping, X-ray photoelectron spectroscopy (XPS), electron paramagnetic
resonance (EPR) spectroscopy, and nitrogen adsorption–desorption
isotherms. Experiments showed that the as-obtained NiFe-Pi/NF presented
excellent OER catalytic activity in a 1 M KOH solution. To deliver
a current density of 10 mA cm–2, the present catalyst
only required the overpotential of 206 mV with the Tafel slope of
31 mV dec–1. More importantly, the catalytic activity
of the as-obtained NiFe-Pi/NF catalyst hardly decreased after continuously
catalyzing 300 h at the current density of 20 mA cm–2, displaying excellent long-term stability. Compared with commercial
RuO2, the present NiFe-Pi/NF catalyst possessed better
catalytic activity, indicating that the as-obtained NiFe-Pi/NF catalyst
can be used as a potential OER catalyst in practical application.
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Keywords
NiFe-PiEPRRuO 2densityTafel slopeXPSultrathin nanotubescatalyzing 300 h1 M KOH solutionXRDX-ray photoelectron spectroscopy206 mVcmhydrothermal route90 miniron sourceOER catalystTEMnickel sourceNFNi foamNa 2 HPO 4FESEMEDSfield-emission scanning electron microscopymAFacile Hydrothermal Synthesisas-obtained product