4 research outputs found
Reduced graphene oxide-supported nickel oxide catalyst with improved CO tolerance for formic acid electrooxidation
The superior catalytic activity along with improved CO tolerance for formic acid electro-oxidation has been demonstrated on a NiO-decorated reduced graphene oxide (rGO) catalyst. The cyclic voltammetry response of rGO-NiO/Pt catalyst elucidates improved CO tolerance and follows direct oxidation pathway. It is probably due to the beneficial effect of residual oxygen groups on rGO support which is supported by FT-IR spectrum. A strong interaction of rGO support with NiO nanoparticles facilitates the removal of CO from the catalyst surface. The chronoamperometric response indicates a higher catalytic activity and stability of rGO-NiO/Pt catalyst than the NiO/Pt and unmodified Pt electrode catalyst for a prolonged time of continuous oxidation of formic acid. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved
Preparation of electro-reduced graphene oxide supported walnut shape nickel nanostructures, and their application to selective detection of dopamine
A selective and sensitive method is reported for the
detection of dopamine (DA) by using electro-reduced
graphene oxide (er-GO) supported walnut shape nickel nanocomposite
(er-GO-Ni) modified glassy carbon electrode. The
surface morphological characterizations reveal that the Ni
nanoparticles were homogeneously distributed on the er-GO
nanosheets. Subsequently the electrochemical study shows an
excellent selectivity, reproducibility, low detection limit (10
± 0.03 nM), high sensitivity (23.3 nA·μM−1
), and reasonably
wide linear range (0.05–50 μM) for the detection of DA at
+0.1 V vs SCE. The selectivity for DA over ascorbic acid and
uric acid is attributed to the charge-based discrimination of the
modified electrode. An excellent correspondence of calculated
and reported rate constant for the DA oxidation is also obtained
by hydrodynamic experiments using a rotating disk
electrode