Fabrication and electrochemical sensing property of a composite film based on a polyoxometalate and palladium nanoparticles

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• 作者：Huiyuan Ma^a ; ^b ; ^{mahy017@163.com} ; Zhijing Zhang^a ; ^b ; Haijun Pang^a ; Shuang Li^a ; Yanyan Chen^a ; Wenjie Zhang^a
• 关键词：Polyoxometalate ; Palladium nanoparticles ; Hydrogen peroxide ; Hydrazine sulfate ; Electrochemical sensor
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 May, 2012
• 卷：69
• 期：Complete
• 页码：379-383
• 文件大小：620 K

摘要

A Dawson type polyoxometalate K₇P₂W₁₇O₆₁(FeOH₂)路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 渭M (S/N = 3), 66.7 渭A mM^鈭?, 1.5 渭M to 3.9 mM for hydrogen peroxide and 1.5 渭M (S/N = 3), 0.24 渭A mM^鈭?, 2 渭M to 3.4 mM for hydrazine sulfate, respectively. The small Michaelis-Menten constant K_M of PdNPs-containing film compared to PdNPs-free film indicated that introduction of PdNPs enhanced effectively the electrocatalytic ability of the composite film.