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Materials Congress 2018
Page 69
Nano Research & Applications
ISSN: 2471-9838
W o r l d C o n g r e s s o n
Materials Science & Engineering
A u g u s t 2 3 - 2 5 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
P
olyoxometalates (POM) are versatile and attractive compounds due to their molecular and structural diversity which have a
broad range of applications in different fields, such as, electronics, electrocatalysis, sensors and nanotechnology. The aim of
the present research work is the immobilisation of POMs onto the surface of glassy carbon electrode (GCE) to investigate their
potential applications towards the electrocatalysis. A successful immobilisation of the POMs is important for their applications;
two immobilisation methods are employed in this study: the layer-by-layer and incorporation into polymeric matrixes. These
methods were investigated to immobilise Ni
4
(P
8
W
48
O
148
)(WO
2
)]
28-
) POM by using glassy carbon electrode and it’s electrocatalytic
applications towards the chlorate and bromate. For the LBL method to build the cationic layer, a polyethylenimine (PEI) modified
silver nanoparticles (AgNP’s) were selected. It was found that the presence of AgNP’s within the multilayer assemblies enhanced
the electrocatalytic activities of immobilized POM on glassy carbon electrode (GCE) in aqueous solutions. Films were further
characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy
(XPS) and atomic force microscopy (AFM) was employed to determine their elemental composition and surface morphology.
The possibility of the fabrication of polypyrrole films doped with Ni-substituted crown-type POMs Ni
4
(P
8
W
48
O
148
)(WO
2
)]
28-
was
investigated on glassy carbon electrode by chronocoulometry in aqueous buffer. Amperometric sensors for the detection of
bromate based on the Ni-substituted crown type POM Ni
4
(P
8
W
48
O
148
)(WO
2
)]
28-
was investigated with high sensitivity in a linear
range of 0.1-5 mM bromate.
Bushra.ali@dkit.ieImmobilisation of Ni-Crown POM for the
electrocatalysis of bromate and chlorate in water
Bushra Ali and Timothy McCormac
Dundalk Institute of Technology, Ireland
Nano Res Appl 2018, Volume: 4
DOI: 10.21767/2471-9838-C4-018
Figure1
:
(a) CV of a multilayer film comprised of 4-bilayers of AgNP’s/[Ni
4
(P
8
W
48
O
148
)(WO
2
)]
28-
in pH 2.0 buffer at a scan rate of 10mVs
-1
. (b) Typical amperometric response of the bare
glassy carbon electrode (BGCE) (A= 0.0707 cm
2
) with in comparison of a chloride dopped
polypyrrole (PPY-Cl) and a Ni
4
(P
8
W
48
O
148
) (WO
2
)]
28-
POM+ PPY in pH 2.0 buffer up to 2 mM