Electrospun Nanofibers Modified Electrode And Its Electrocatalytic Applications

In this paper, ITO electrode modified with nanofibers was fabricated by an electrospinning technique, and the electrochemical and electrocatalytic activities were investigated. The achievements were showed as follows:1. Cellulose acetate (CA) nanofibers modified indium tin oxide (ITO) electrode was prepared by electrospinning method. Poly(diallylmethylammonium chloride) (PDDA) was firstly deposited on ITO/CA electrode to obtain a positively charged surface. Thenα-[P₂W₁₈O₆₂]^6-(P₂W₁₈) was assembled on ITO/CA/PDDA electrode. The P₂W₁₈/PDDA/CA nanofibers modified ITO electrode exhibited excellent electrocatalytic activity for the reduction of NO₂^- and BrO₃^-. For comparison, we also studied the electrochemical behavior of the P₂W₁₈/PDDA modified ITO electrode without CA nanofibers. The results indicated that the ITO/CA/PDDA/P₂W₁₈ electrode had larger electrocatalytic activity than the ITO/PDDA/P₂W₁₈ electrode for the reduction of NO₂^- and BrO₃^-.2. Cellulose acetate (CA) nanofibers with Ag nanoparticles (AgNPs) were successfully used to modify indium tin oxide (ITO) electrode by direct electrospinning of a CA solution with AgNO3 followed by photoreduction, polyaniline (PANI) was then electrodeposited on the CA-AgNPs nanofibers modified ITO electrode by a potentiostatic technique. The CA-AgNPs/PANI nanofibers modified ITO electrode had the remarkable electrocatalytic activity toward the oxidation of dopamine (DA). At the same time, we also made comparative studies about the electrocatalytic activity toward the oxidation of DA of the ITO/CA/PANI electrode and the ITO/CA-AgNPs/PANI electrode. The results confirmed that the incorporating AgNPs into the composite nanofibers played an important role in improving the electrocatalytic activity of the ITO/CA-AgNPs/PANI electrode.3. Cellulose acetate (CA) nanofibers containing polyaniline (PANI) nanoparticles were successfully electrospun on indium tin oxide (ITO) electrode by one-step method. The cyclic voltammograms (CVs) of ITO/CA/PANI electrode showed the characteristic well-defined redox peaks of PANI, confirming that the polymer presented electroactivity, which also attested to the existence of PANI in CA nanofibers. The electrocatalytic response toward the oxidation of dopamine (DA) of the ITO/CA/PANI electrode was investigated also. The results showed that the composite nanofibers modified electrode had remarkable electrocatalytic activity and excellent stability.