In this work, we report the preparation of high-purity perfluorosulfonated ionomer (Nafion) nanofibers (NFs) via solution blow spinning (SBS). Fiber formation in solution jet spinning is strongly dependent on the structure of the spinning solution. Upon adding a small amount of poly(ethyleneoxide) (PEO) as a spinning aid to Nafion dispersion, most of the highly ordered Nafion aggregate disappeared, allowing the stable production of bead-free and smooth high-purity NFs (Nafion/PEO = 99/1) by SBS. The microstructure of the blowspun Nafion NFs differed from that of electrospun NFs. In the blowspun NFs, incomplete microphase separation between hydrophilic (ionic) and hydrophobic domains was observed, but the crystallization of CF2−CF2 chains was enhanced owing to the high extensional strain rate and rapid solidification during SBS. These findings provide fundamental information for the preparation and characterization of blowspun Nafion NFs.
Recent developments of low-power electronic devices have triggered interests towards small-scale energy storage. One promising approach is to fabricate micro-supercapaciors (MSCs). In this work, we demonstrate a facile fabrication of MSCs by laser reduction and patterning of graphene oxide nanoribbon (GONR) thin films coated on poly(ethylene terephthalate) substrate through LightScribe technique. We fabricated the in-plane geometry electrodes consisting of reduced GONRs (i.e., graphene nanoribbons, GNRs) with the lateral spatial resolution of approximately 20 µm in addition to the stacked geometry electrodes for comparison. The fabricated in-plane-GNR electrode device showed superior electrochemical properties compared with the stacked-GNR electrode ones. Our impedance measurements supported that this is due to high lateral ion diffusivity along the basal plane of GNRs. In addition, GNR-based in-planeelectrode device also showed a higher capacitance than the graphene-based one, which is due to the more efficient edge effects of GNRs.
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