Preparation of Polyaniline Nanofibers And Experimental Study On Their Electrochemical Properties And Conductivity

Among nano polyaniline materials, polyaniline nanofibers are the most important. The low conductivity and poor processability have become the biggest obstacles to the application of polyaniline as a practical material. The excellent characteristics of new polyaniline nanofiber materials can just overcome the shortcomings of Polyaniline in forming and processing. In this study, a new polyaniline nanofiber was prepared by chemical oxidation, its structure was characterized, the mechanism of improving its conductivity was studied, and its superior electrocatalytic activity was evaluated by Electrochemical performance test. The results show that the diameter of polyaniline nanofibers is 20nm ~ 50nm and the fiber length is 2µm ~ 5µm. The structure is uniform and the conductivity can reach 13.5 S/cm. he electrocatalytic activity of polyaniline nanofibers for oxygen evolution and chlorine evolution was systematically tested. It was found that the electrocatalytic activity of polyaniline nanofibers for oxygen evolution was higher than that of polyaniline nanofibers. The electrocatalytic activity of carbon paper electrode prepared by β-PbO2 nano powder is superior to that of traditional chlorine evolution anode Ti/RuO2.

A new strategy for long-term smart corrosion protection of Q235 carbon steel using polyaniline nanofiber covalently linking with modified GO as reinforcement of epoxy coating

Polyaniline nanofiber (PANI-f) was covalently linked with cetyltrimethyl ammonium bromide (CTAB) modified graphene oxide nanosheets (CTGO) to fabricate a smart composite coating for corrosion protection of carbon steel. In the copolymerization process, CTAB served both as a modifier for the modification of GO and a dispersant for the preparation of polyaniline nanofibers. The prepared PANI-f can avoid the accelerated corrosion of steel by conventional synthesis method using hydrochloric acid as medium. The covalent binding between PANI-f and CTGO improved the compatibility of PANI-f-GO with the waterborne epoxy emulsion, which significantly enhance the hydrophobicity and anti-permeability of the coating. The PANI-f-GO waterborne epoxy coating exhibited excellent smart corrosion protection efficiency by catalyzing the formation of passivation film on steel surface. Molecular adsorption energy on Fe(110) and radial distribution function confirmed the chemical adsorption of the PANI-f-GO composite on the steel surface. The superior smart protective performance can be ascribed to the synergistic effects of PANI-f and CTGO.

Phenol Removal using Corona Discharge Plasma Combined with Porous Polyaniline Nanofiber

A contemporary design for a recirculated flow dual remediation system was successfully developed for phenol remediation. The system involved Corona Discharge Plasma (CDP), accompanied by Polyaniline Nanofiber (PANNFs) as a solid adsorbent. PANNFs was obtained using simple chemical oxidation polymerization at room temperature. Different chemo-physical characterization techniques were employed to examine the produced polyaniline such as Fourier Transform Infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Brunauer, Emmett, and Teller (BET) surface area analysis. The primary purpose of the used PANNF powder is to facilitate the phenol degradation using plasma by collecting the phenol molecules on the surface of PANNFs. The phenol removal percentage of 99% was attained at a treatment time of 60 min using the developed dual system. Finally, a slight synergetic effect between the used two remediation processes, PANI as adsorbent and CDP treatment, was approved. PANNFs existence in the remediation system also helps to save the consumed power in degradation using CDP.

Electrodeposition polyaniline nanofiber on the PEDOT:PSS-coated SiNWs for high performance supercapacitors

In this article, a novel silicon-based electrode was designed with the facile solution methods. With the modification of highly conductive PEDOT:PSS layer on the SiNWs by the spin-coated method (SiNWs-PSS), three-dimensional (3D) porous network polyaniline nanofibers (PANI) film was uniformly electrodeposited on the silicon surface (SiNWs-PSS@PANI). The sheet resistances of the PEDOT:PSS layer with different surfactants as well as the deposition time of the PANI were investigated. After optimization, the fabricated SiNWs-PSS@PANI electrode displayed high capacitance about 301.71 mF cm-2 at the current density of 1mA cm-2, which enhanced ~29 fold comparing to 10.18 mF cm-2 of electrode without the PEDOT:PSS layer between the SiNWs and PANI (SiNWs@PANI), outperforming most values of the reported silicon-based electrodes. The electrode designed in this paper provides a new idea to fabricate high-performance of silicon-based micro-supercapacitors with the simple and low-temperature method.

Bio-inspired vertically aligned polyaniline nanofiber layers enabling extremely high-efficiency solar membrane distillation for water purification

A bio-inspired PANI nanofiber layer was fabricated on the surface of a hydrophobic PVDF microfiltration membrane for solar-driven distillation. This membrane possesses high solar energy-to-collected water efficiency for freshwater production under one sun irradiation.