Ultrafine Ni–Pt Alloy Nanoparticles Grown on
Graphene as Highly Efficient Catalyst for Complete Hydrogen Generation
from Hydrazine Borane
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Abstract
Ultrafine Ni–Pt alloy NPs
grown on graphene (NiPt/graphene)
have been facilely prepared via a simple one-step coreduction synthetic
route and characterized by transmission electron microscopy, energy-dispresive
X-ray spectroscopy, X-ray diffraction, inductively coupled plasma
atomic emission spectroscopy, X-ray photoelectron spectroscopy, Raman
and Fourier transform infrared methods. The characterized results
showed that ultrafine Ni–Pt NPs with a small size of around
2.3 nm were monodispersed on the graphene nanosheet. Compared to the
pure Ni<sub>0.9</sub>Pt<sub>0.1</sub> alloy NPs, graphene supported
Ni<sub>0.9</sub>Pt<sub>0.1</sub> alloy NPs exhibited much higher activity
and hydrogen selectivity (100%) toward conversion of hydrazine borane
(HB) to hydrogen. It is first found that the durability of the catalyst
can be greatly enhanced by the addition of an excess amount of NaOH
in this reaction, because of the neutralization of NaOH by the byproduct
H<sub>3</sub>BO<sub>3</sub> produced from the hydrolysis of HB. After
six cycles of the catalytic reaction, no appreciable decrease in activity
was observed, indicating that the Ni<sub>0.9</sub>Pt<sub>0.1</sub>/graphene catalysts have good durability/stability
