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Author: search.filters.author.Simpraditpan, AthaponSubject: search.filters.subject.nanocomposite

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    Modification of dye-sensitized solar cell working electrode using TiO 2 nanoparticle/N-doped TiO2 nanofiber composites
    (2014-01-01)
    Mekprasart, Wanichaya
    ;
    Suphankij, Sineenart
    ;
    Tangcharoen, Thanit
    ;
    Simpraditpan, Athapon
    ;
    Pecharapa, Wisanu
    Nanocomposite films of N-doped TiO<inf>2</inf> nanofibers (NFs) and commercial-grade TiO<inf>2</inf> nanoparticles Degussa (P25) were utilized as working electrode of typical dye-sensitized solar cells (DSSCs). N-doped TiO<inf>2</inf> NFs were fabricated via electrospinning method using ammonium acetate (CH<inf>3</inf>COONH<inf>4</inf>) as nitrogen source and titanium (IV) isopropoxide (TiP) in ethanol as starting precursor in combination with calcinations process. The electrospun NFs were characterized by XRD, Raman spectroscopy, XPS, SEM, and TEM. The photoelectric conversion performance of the DSSCs with composite film electrode was compared to the device using pure P25 film. The result shows that as calcination temperature increases, the anatase-to-rutile phase transformation and the fiber size reduction of NFs were observed. The energy conversion efficiency (η) of the device tends to increase with increasing calcined temperature with specific nanofiber loading content, indicating the significant enhancement in the device performance by the incorporation of the NFs. This enhancement of DSSCs may attribute to high surface area, higher light scattering and light harvesting, low charge recombination, and fast electron-transfer rate by loaded NFs. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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    Hydrothermal synthesis of nanofibers from natural ilmenite mineral and their utilization for dye-sensitized solar cell
    (2013-12-01)
    Simpraditpan, Athapon
    ;
    Wirunmongkol, Thanakorn
    ;
    Pavasupree, Sorapong
    ;
    Pecharapa, Wisanu
    Titanate nanofibers were synthesized by a hydrothermal method using a low-cost ilmenite mineral as the starting material. The crystalline structure of the as-synthesized nanofibers demonstrated titanate structure (H <inf>2</inf>Ti<inf>x</inf>O2x+<inf>1</inf>). The bi-crystalline mixture consisting of TiO2 (B) and anatase TiO<inf>2</inf> nanofibers was obtained by heat treatment at 500°C for 2 h. Dye-sensitized solar cells (DSSCs) with photoanode consisting of the nanocomposite of nanoparticles and nanofibers (5%) rendered a light-to-electricity conversion efficiency (η) of 0.28%. In contrast, the cells with photoanodes consisting of only nanoparticles and nanofibers exhibited η of 0.25% and 0.15%, respectively. © 2013 Copyright Taylor and Francis Group, LLC.