Rational construction of self-template catalysts for efficient electrolytic water splitting reactions is being a challenging prospect in sustainable energy production. For the first time, owing to these aims, we report a self-template representation of self-assembled iron-modulated cobalt-nickel phosphide (Fe-CoNiP) grown on 3Dnickel foam (NF) using a facile amine hydrolysis-approached synergetic phosphorylation strategy. Due to its unique vertically standing self-template hierarchical nanoarrays and atomic modulated multicomponent system, these Fe-CoNiP nanoarchitectures exhibit excellent electrocatalytic hydrogen and oxygen evolution reactions with very low applied overpotentials of 110 and 280 mV to obtain 10 mA cm −2 , respectively, and an overpotential value of 390 mV (J 10 ) obtained for overall water splitting overtakes most precious-metal/phosphide-based electrocatalysts in an alkaline medium. Moreover, the rationally cocrystallized Fe-CoNiP binder-free electrocatalyst as a multifunctional electrode has robust physicochemical stability above 2 days with very little degradation during alkaline electrolysis. These demonstrated results may lead to new insights into constructing an alternative electrocatalyst with hierarchical nanoarchitecture to boost the overall water splitting.
The focus of the
work is the synthesis of SnS2 nanomaterials
with (peg-SnS2NF) and without (sf-SnS2NR) the involvement of the organic template and the
comparative study of their catalytic activities. The synthesis of
these materials was achieved in a single-step procedure aided by hexamethyldisilazane
(HMDS). These nanoparticles were subjected to X-ray diffraction, transmission
electron microscopy, scanning electron microscopy, Raman spectroscopy,
and UV–vis spectroscopy analyses to investigate their structural,
topographical, surface, and optical properties. The present work suggests
that the surfactant-free SnS2 nanoring (sf-SnS2NR) catalyst has lower surface area compared to the
poly(ethylene glycol)-stabilized SnS2 nanoflower (peg-SnS2NF) catalyst but shows high activity under
visible light for the photoreduction of Cr(VI) and the photocatalytic
degradation of organic dyes. The work exposed the importance of the
clean surfaces on the catalyst and is expected to have a high impact
on the photocatalytic activity of the SnS2 nanomaterial.
The study also endorses the utility of the HMDS-assisted synthetic
method for the production of multifunctional semiconductor tin disulfide
nanomaterials with multiple potential applications.
The progress for
the development of active, stable, and economic
catalysts for the chemical transformation of noxious chemicals to
benign is of primary importance. The synthesis of surfactant-free
chalcopyrite, sf-CuFeS2
, by a wet-chemical
one-pot hexamethyldisilazane-assisted synthetic method was accomplished.
Various analytical and spectroscopic techniques were used for the
physical characterization of the material produced. From the observation
of magnetic properties, the material chalcopyrite was found to be
paramagnetic. The dielectric constant and dielectric loss were also
determined and were found to be decreasing with an increase in frequency.
The dielectric behavior of the material was explained by the Maxwell–Wagner
theory of polarization, and the dielectric constant of the as-synthesized
sample was found to be 3.176 at 100 °C and 500 kHz. The potential
catalytic activity was confirmed by performing the reduction of 4-nitrophenol
(4-NP) to 4-amino phenol (4-AP) in the presence
of sodium borohydride (NaBH4) in aqueous medium at room
temperature. The catalyst showed about 90% yield in the reduction
reactions, which can be attributed to easy access to active sites
invigorated by the absence of surfactant molecules. The reusability
of the catalyst was checked to find out the stability, and excellent
retention of activity up to five cycles was observed.
The ease of production of materials and showing multiple applications are appealing in this modern era of advanced technology. Cobalt–iron chalcogenides showing multiple application is reported.
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