Polyaniline Nanofibers Obtained by Electrospin Process for Hydrogen Storage Applications

A Phani, Robin De, Britto, S Srinivasan, L Stefanakos
Advances in Applied Physical and Chemical Sciences-A Sustainable Approach   unpublished
Conducting polymer nanostructures combine the advantages of organic conductors and low dimensional systems and therefore should yield many interesting physicochemical properties and useful applications. This leads to much faster and more responsive chemical sensors, new organic / polyaniline nanocomposites and ultra-fast non volatile memory devices. In conventional polymerization, nanofibers are subject to secondary growth of irregularly shaped particles, which leads to the final granular
more » ... erates. The key to producing pure nanofibers is to suppress secondary growth. Based on this, two methods-interfacial polymerization and rapidly mixed reactions have been developed that can readily produce pure nanofibers by slightly modifying the conventional chemical synthesis of polyaniline without the need for any template or structural directing material. With this nanofiber morphology, dispersibility and processbility of polyaniline are now much improved. In the present investigation, highly rough and large surface area polyaniline nanofibers have been grown by using a electrospinning process already synthesized polyaniline using polymethylmethacrylate (PMMA) as polymer binder. Several experiments have been carried out under different parameters such as distance between the substrate and syringe, different wt% load of PMMA in PANI, voltage applied between substrate and syringe in order to obtain nanofibers as thin as 60 nm in diameter. Structural, Morphological, Structural, Chemical, optical properties have been investigated. Effect of surfactants and polymer binder on the formation of polyaniline nanofibers morphology, structure has been systematically investigated. We also have carried out the investigation to reversibly store H 2 in these polyaniline nanofibers. The rate of hydrogen sorption during the initial run is found to be very rapid and an extended plateau pressure of about 30 bars is obtained from the pressure-composition isotherm profiles of these polyaniline nanofibers. The reversible cycling capacity of ~10.5 wt.% is demonstrated at an operating temperature of 120C and have been attributed due their unique microstructural and surface properties.