Self-assembly Film Based On The ITO Electrode Modified With Nanofibers And Its Electrocatalysis

Nanofibers modified ITO electrode was fabricated via electrospinning, then the electrode was further modified with different materials by self-assembly technique. The chemical and electrocatalytical behavior of as-prepared electrode was investigated. The achivements was shown as follows:1. Poly (vinyl alcohol) (PVA) nanofiber mats were collected on indium tin oxide (ITO) substrate by electrospinning method. A multilayer film composed ofα-[P2W18O62]6- (abbr. P2W18), a polyoxometallate (POM) anion, and poly (diallymethylammonium chloride) (abbr. PDDA) was fabricated by layer-by-layer (LBL) self-assembly technique on the PVA/ITO electrode. The PDDA/P2W18 multilayer film could be unselectively or selectively deposited on the PVA/ITO electrode via changing amount of PVA nanofibers on the ITO substrate. Electrocatalytic effects of the PDDA/P2W18 multilayer film unselectively and selectively deposited on the PVA/ITO electrode on NO2- were observed.2. Chitosan nanofibers were successfully deposited on indium tin oxide (ITO) substrates by electrospinning chitosan solution. After neutralization with saturated Na2CO3 aqueous solution to maintain its fibrous structure,α-[P2W18O62]6- (abbr. P2W18) was immobilized on the chitosan nanofibers by one step self-assembly technique. The cyclic voltammetric responses showed that the ITO electrode modified with chitosan nanofibers had three well redox couples of P2W18. The eletrochemical behavior of the electrode prepared under the different condition of pH value demonstrated that the ITO electrode was stable between pH=1.8 and pH=3.1. In addition, the modified ITO electrode exhibited high electrocatalytic activity for the reduction of NO2-.3. Chitosan (CS) nanofibers were successfully used to modify indium tin oxide (ITO) electrode by electrospinning technique. Then, Prussian blue (PB) nanoparticles were electrodeposited on the CS nanofibers by potentiostatic technique in an acidic solution containing single ferricyanide. By this method, direct synthesis of PB nanoparticles on the nanofibers that were used for modifying electrode came true. The amount of the PB nanoparticles on the CS nanofibers increased with increasing potential value of the electrodeposition. In addition, the cyclic voltammetric response displayed two characteristic redox couples of PB. The modified electrode exhibited high electrocatalytic activity towards reduction of H2O2.