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

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.