Direct determination of oxalic acid by a bare platinum electrode contrasting a platinum nanoparticles-modified glassy carbon electrode
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Abstract:
A bare platinum disk electrode without further decoration was directly used to determine oxalic acid (OA), showing good linear ranges of 0.57–104.01 μM and 104.01–228.75 μM with a low detection limit of 0.38 μM (S/N = 3). In contrast, platinum nanoparticles (PtNPs) dispersed on a glassy carbon electrode were successfully achieved by an one-step electrochemical deposition method, possessing relatively wider linear detection ranges of 1.14–342.80 μM and 342.80–548.92 μM for OA with a lower detection limit of 0.28 μM (S/N = 3). Both the proposed electrochemical sensors exhibit great reproducibility, stability and selectivity. In particular, they have been applied to the determination of OA in real spinach samples, showing excellent analytical performance.Keywords:
Oxalic Acid
Platinum nanoparticles
Glassy carbon
Carbon fibers
Platinum nanoparticles
Glassy carbon
Carbon fibers
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Glassy carbon
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Glassy carbon
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For the first time,the electrooxidation of methanol was investigated on the platinum nanoparticles-modified platinum electrode using cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) techniques.The results demonstrated that the oxidation current of methanol was greatly enhanced due to the immobilization of platinum nanoparticles,and also indicated that the increased oxidation current was not only originated from the enhancement of electrode surface and nanoparticles of platinum had an peculiar catalysis for the methanol oxidation.
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Colloidal silica modified with a hydridosilsesquioxane (HSiO3/2) layer reacted with Karstedt's catalyst, bis(1,3-divinyl,1,1,3,3-tetramethyldisiloxane) platinum(0), to give catalytically active surface-bound platinum nanoparticles with an average diameter of 2 nm. The supported platinum nanoparticles could be recycled through at least three consecutive hydrosilation reactions while maintaining their catalytic activity. It is postulated that the mesh microstructure of the grafted hydridosilsesquioxane layer supports and protects the supported platinum nanoparticles from aggregating into larger inactive platinum species.
Platinum nanoparticles
Hydrosilylation
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Oxalic Acid
Glassy carbon
Carbon fibers
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Platinum nanoparticles
Thermogravimetric analysis
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