Evaluating and empirical modeling of the electrocatalytic activity and morphology of electrospun polyacrylonitrile/polyaniline/tungsten trioxide nanofibers
2020
Eslah, Sanaz | Nouri, Mahdi
Electrically conductive polyacrylonitrile/polyaniline/tungsten oxide (PAN/PANI/WO₃) nanofibers were produced through an electrospinning method. The PAN polymer was used to enhance the spinnability of the polyaniline solution. The surface morphology and electrocatalytic properties of the mats were examined by scanning electron microscopy and electrochemical impedance spectroscopy method. Response surface methodology was applied to predict the relation between both the average diameters of the nanofibers and the charge-transfer resistance (Rcₜ) of nanofibrous mats with the concentration of polyaniline and tungsten oxide. Design-Expert7 software was selected for the response data analysis of the contour plots. Direct relation was observed between the average diameters of the nanofibers with WO₃ concentration in electrospinning solution. However, with increasing polyaniline content, the average diameters of nanofibers decreased. The results showed that both the PANI and WO₃ concentrations (%wt.) had significant effects on the nanofibers diameters. In the case of electrocatalytic activity, the increasing of both composite components in the spinning solutions had positive effect on the lowering of the charge-transfer resistance and the changes were statistically significant.
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