Preparation of platinum nanoparticles on polyaniline-coat multi-walled carbon nanotubes for adsorptive stripping voltammetric determination of formaldehyde in aqueous solution

Abstract

Platinum nanoparticles on polyaniline-coat multi-walled carbon nanotubes were fabricated by electrochemical method at paraffin-impregnated graphite electrode (Pt/PAN/MWCNTs). The material was characterized by various methods including field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical techniques. The electrode has been effectively applied toward formaldehyde (HCHO) sensing. A good linear response curves from 1 9 10 -9 to 1 9 10 -3 M can be obtained with a lower detection limit of 4.6 9 10 -11 M (S/N 3). The successful preparation of nanocomposites opens a new path to fabricate the promising sensor for HCHO.

Synthesis and Characterization of Te Nanotubes Decorated with Pt Nanoparticles for a Fuel Cell Anode/Cathode Working at a Neutral pH

“…On the other hand, massive application of the expensive Pt-based catalyst implies a substantial increase in actual costs in fuel cells or sensor technology development, thereby, reducing their commercial competitiveness. To reduce the effective device cost by improving the electrocatalytic efficiency of electrode materials with the increment of the active surface, the use of platinum nanostructures in different suitable shapes (i.e., nanowires, nanotubes, nanoparticles) has been studied [10][11][12][13][14][15]. Additionally, the presence of a different metal (e.g., Cu, Sn, Co, Ni, Pd, Au, Ag, Fe, Zn, Ru) to form platinum-based hetero-nanostructures or alloy catalysts, can further reduce the Pt amount to be used, since these alloys exhibit better electrocatalytic properties than platinum monometallic counterpart nanomaterials [16].…”

Synthesis and Characterization of Te Nanotubes Decorated with Pt Nanoparticles for Fuel Cell Anode/Cathode Working at Neutral pH

“…nanowires, nanotubes, nanoparticles) has been studied. [10][11][12][13][14][15] Besides, the presence of a different metal (e.g., Cu, Sn, Co, Ni, Pd, Au, Ag, Fe, Zn, Ru) to form platinum based hetero-nanostructures or alloy catalysts, can further reduce the Pt amount to be used, since these alloys exhibit better electrocatalytic properties than platinum monometallic counterpart nanomaterials. [16] This strategy is particularly helpful when Pt is used in combination with other inexpensive metals.…”

The electrochemical determination of formaldehyde in aqueous media using nickel modified electrodes

“…A small body of research exists in the field of electrochemical formaldehyde determination, with approaches typically using platinum [15,16], palladium [17][18][19][20][21] or gold [22] electrocatalysts. Typically these studies are conducted in sulfuric acid or sodium hydroxide solution, and use various nanoarchitectures and complex fabrication methods in their design.…”

“…Typically these studies are conducted in sulfuric acid or sodium hydroxide solution, and use various nanoarchitectures and complex fabrication methods in their design. Detection limits are typically of the order of 10 -5 M, though some palladium electrodes have been reported to determine formaldehyde concentrations as low as 10 -11 M. [16] Nickel modified electrodes in alkaline solution are well-known catalysts towards small organic molecules. The Ni(III) species in the oxidised NiOOH readily reacts with organic compounds, oxidizing the organic analyte and reforming the Ni(OH)2 species [23][24][25][26].…”