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Size-controlled synthesis of Fe2O3 and Fe3O4 nanoparticles onto zeolite by means of a modified activated-coprecipitation method: effect of the HCl concentration during the activation |
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| Authors: | S Mendoza-Bello Raúl A Morales-Luckie L Flores-Santos Juan P Hinestroza Víctor Sanchez-Mendieta |
| Institution: | 1. Faculty of Industrial Sciences and Technology (FIST), Universiti Malaysia Pahang, 26300, Pahang, Malaysia 2. NUS Center for Nanofibers and Nanotechnology, Singapore, Singapore 3. Department of Mechanical Engineering, Engineering Drive, National University of Singapore, Singapore, 117584, Singapore 4. King Saud University, Riyadh, 11451, Saudi Arabia |
| Abstract: | Tubular nanofibers (TNFs) of vanadium pentoxide (V2O5) were synthesized by electrospinning technique using a single spinneret for the first time by controlling the properties of the precursor solution. A partially miscible polymeric solution of vanadium oxytrihydroxide VO(OH)3] was produced by hydrolysis of vanadyl acetylacetonate in Poly(vinylpyrrolidone) (PVP). The phase-separated polymer solution formed the core of the electrospun fibers whereas the VO(OH)3 formed the shell; the core PVP has been removed by controlled heat treatment. The TNFs had an inner diameter ~60?nm and wall thickness ~±100?nm. The capacitive behavior of the V2O5 TNFs was studied using cyclic voltammetry and galvanostatic cycling techniques. The studies showed ideal stable supercapacitive characteristics in the electrospun V2O5 TNFs. |
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