四铁取代的夹心型钨砷酸盐的合成及玻碳电极表面多层膜组装与电催化性质研究

碳电极表面的修饰在电化学和材料科学中很重要 .最近 ,通过层与层电子间的相互作用来自组装修饰玻碳电极已引起人们的关注 [1] .运用这种方法可将一些功能团修饰到电极表面 ,赋予电极一些新的功能 [2 ] .过渡金属取代的多金属氧酸盐不仅在配位环境 ,而且在催化活性方面都类似于金属卟啉和其它大环配体金属配合物 [3] .将其修饰到玻碳电极表面已有文献报道 [4 ] .由于修饰电极的厚度可控、成分可调及具有良好的电催化活性 ,在生物传感器和电子器件等方面具有潜在的应用前景 .取代型夹心型多金属氧酸盐具有大摩尔质量和高电荷密度 ,表现出优秀…

Synthesis of Tetra-iron Substituted Sandwich-type Pentadecatungstodiarsenate and Its Multilayers on Glassy Carbon Electrode by Self-assembly with Electrocatalytic Properties

A novel sandwich|type compound, Na-{12}[Fe-4(H-2O)-2(As-2W-{15}O-{56})-2]538H-2O(denoted as Fe-4As-4W-{30}) was synthesized. The compound was well characterized by means of IR, UV|Vis, {{}+{183}W NMR} and elemental analyses. Redox electrochemistry of the compound has been studied in acid buffer solutions using cyclic voltammetry(CV). The compound containing multilayer films has been fabricated on the 4|aminobenzoic acid(4|ABA) modified glassy carbon electrode(GCE) surface by alternate deposition with a quaternized poly(4|vinylpyridine) partially completed with [Os(bpy)-2Cl]+{2+/-}(denoted as QPVP|Os). CV, X|ray photoelectron spectroscopy(XPS) and UV|Vis spectroscopy were used to characterize the as|prepared multilayer films. It is proved that the multilayer films are uniform and stable. The electrocatalytic activities of the multilayer films were investigated on the reduction of two substrates of important analytical interest, NO+--2 and H-2O-2.