Preparation And Application Research Of Conductive EVOH Nanofibers

Polypyrrole(PPy) nanofiber is one of the excellent nanomaterials with high conductivity, good biocompatibility and fast reversible oxidation-reduction reaction. However, the low solubility and infusibility of PPy nanofibers lead to its follow-up processing before using as raw materials. In present research, a three-dimensional and hierarchically porous conductive nanofiber-composite was prepared efficiently via in suit method with PPy nanofibers and EVOH nanofibers, then applied it to microbial fuel cell and pressure sensor fields.PPy nanofibers were synthesized with a soft-template of AQS during chemical oxidation of pyrrole. Meanwhile, the effect of reaction time, stirring rate, substrate and surfactant to microcosmic morphology and conductivity of PPy nanofibers were investigated. It turned out that the optimum PPy nanofibers composite could be obtained under the condition of reaction time of 4 h, stirring rate of 200 r/min, and the substrate of PET nonwovens with AQS.EVOH nanofibers-based anode of microbial fuel cell was fabricated by polymerization of pyrrole. The difference of spatial structure, electrochemical impedance spectroscopy and cyclic voltammetry performance were studied simultaneously. The results showed that porous structure of composite anode could promote exoelectrogens cloning and mass transfer to inner, and after three-period acclimation of microorganism, the limited-anode microbial fuel cell delivers an ultra-high power density of 2420 mW/m2.To make EVOH nanofibers aerogel through physical crosslinking of PVA. Moreover, the microcosmic morphology and mechanical strength were characterized in detail. Then taking a suitable content of PVA to crosslink EVOH nanofibers, and regarding PPy nanofibers as the conducting materials to prepare the conductive aerogel. Meanwhile, an aerogel-based pressure sensor was also set up to study its sensitivity of 0.5 N. It reflected that an EVOH nanofiber aerogel with lowest elasticity modulus was fabricated at the content of PVA was 0.6%, and the response time of pressure sensor was about 0.5~1.0 s.