| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 188770 | Electrochimica Acta | 2012 | 5 Pages |
A Dawson type polyoxometalate K7P2W17O61(FeOH2)·8H2O (P2W17Fe) and palladium nanoparticles (PdNPs) was used to construct a electrochemical sensing film. The composite film was fabricated by alternately depositing PdNPs and P2W17Fe on quartz and ITO substrates using the layer-by-layer method (LBL). The composite film was characterized by UV–visible spectrum, X-ray photoelectron spectrum and atomic force microscope. Cyclic voltammetry and amperometry were employed to explore the composite film's electrochemical properties and performance in sensing and detection. The results indicated that the composite film has good electrocatalytic activity towards the reduction of hydrogen peroxide and oxidation of hydrazine sulfate, and is capable of sensing H2O2 and N2H4SO4 at suitable potential. The detection limit, sensitivity and linear concentration range are 1 μM (S/N = 3), 66.7 μA mM−1, 1.5 μM to 3.9 mM for hydrogen peroxide and 1.5 μM (S/N = 3), 0.24 μA mM−1, 2 μM to 3.4 mM for hydrazine sulfate, respectively. The small Michaelis–Menten constant KM of PdNPs-containing film compared to PdNPs-free film indicated that introduction of PdNPs enhanced effectively the electrocatalytic ability of the composite film.
Graphical abstractThe electrochemical sensing film has been constructed by palladium nanoparticles (PdNPs) and a polyoxometalate K7P2W17O61(FeOH2)·8H2O (P2W17Fe) using the layer-by-layer (LBL) method and characterized by UV–visible spectrum, X-ray photoelectron spectrum and atomic force microscope. The composite film exhibits good electrocatalytic activity towards the reduction of H2O2 and oxidation of N2H4SO4, and is capable of sensing H2O2 and N2H4SO4 at suitable potential with a low detection limit, which was permitted by the contributions of the polyoxometalate and palladium nanoparticles in the film.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A sensitive electrochemical sensing film was fabricated by the layer-by-layer method. ► The incorporation of PdNPs into the film enhanced the electrocatalytic ability. ► The composite film is capable of sensing H2O2 and N2H4SO4 at suitable potential.
