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Electrospun coaxial titanium dioxide/carbon nanofibers for use in anodes of dye-sensitized solar cells

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Title
Electrospun coaxial titanium dioxide/carbon nanofibers for use in anodes of dye-sensitized solar cells
Author
Hieu, Nguyen TrungBaik, , Seung JaeJun, YongseokLee, MinohChung, Ok HeePark, Jun Seo
Keywords
Carbonization; Coaxial nanofiber; Dye-sensitized solar cell; Electrospinning; Titanium dioxide
Issue Date
201410
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.142, no., pp.144 - 151
Abstract
TiO2/carbon coaxial-structured nanofibers (TCNFs), applied as photoanodes in dye-sensitized solar cells (DSSCs), were fabricated by coaxial electrospinning. The precursor of the TCNFs was electrospun using polyacrylonitrile in the core and a blend of titanium isopropoxide and polyvinylpyrrolidone in the shell. After calcination at 500 °C for 2 h in air and subsequent carbonization at 1000 °C for 2 h in nitrogen, the TCNFs were formed with nanocrystalline TiO2 in the shell layer and carbon in the core. The structure and morphology of the TCNFs were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The photovoltaic properties of the TCNF photoelectrode-based DSSCs were investigated by determining current density-voltage (J-V) curves, incident photon-to-current conversion efficiency (IPCE), and electrochemical impedance spectroscopy (EIS). The power conversion efficiency (PCE) of the TCNF photoelectrode-based DSSC was 7.5%, higher than those of DSSCs with TiO 2 nanofiber (TNF)- and TiO2 nanoparticle (TNP)-based photoelectrodes. An increase in the electron transport and suppression of charge recombination were found with the carbon core and nanocrystalline TiO 2 shell configuration of the TCNFs.
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DOI
http://dx.doi.org/10.1016/j.electacta.2014.07.032
ISSN
0013-4686
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