Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (03): 578-584.doi: 10.3866/PKU.WHXB201201032

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation of Single-Crystalline TiO2 Nanowires and Their Application in Flexible Dye-Sensitized Solar Cells

XIAO Yao-Ming, WU Ji-Huai, YUE Gen-Tian, LIN Jian-Ming, HUANG Miao-Liang, FAN Le-Qing, LAN Zhang   

  1. Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou 362021, Fujian Province, P. R. China
  • Received:2011-10-18 Revised:2011-12-20 Published:2012-02-23
  • Contact: WU Ji-Huai
  • Supported by:

    The project was supported by the National High-Tech Research and Development Program of China (863) (2009AA03Z217) and National Natural Science Foundation of China (90922028, 51002053).

Abstract: Single-crystalline TiO2 nanowires (SCTNWs) were prepared using a hydrothermal growth method. The (010) crystal face of the titania particles was eroded by NaOH solution to produce Na2Ti4O9 at high temperature and pressure. H2Ti4O9·H2O was generated after washing with distilled water and HCl, which was then linked to a wire by hydrogen bonding. Finally, sintering gave SCTNWs. The SCTNWs were characterized by transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The influence of hydrothermal growth time was investigated. A flexible photoanode was fabricated on Ti foil using a highly stable and uniform titania colloid including the SCTNWs. The photovoltaic performance of dye-sensitized solar cells (DSSCs) containing different contents of SCTNWs was evaluated using scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), ultraviolet-visible (UV-Vis) spectrophotometry, and photovoltaic tests. Under optimized conditions with 7.5% (w) SCTNW, a flexible DSSC with a lightto- electrical energy conversion efficiency of 6.48% was achieved under irradiation with simulated solar light with an intensity of 100 mW·cm-2.

Key words: Flexible dye-sensitized solar cell, Titania, Nanowire, Hydrothermal method, Flexible photoanode