Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (10): 1957-1962.doi: 10.3866/PKU.WHXB201408041

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Synthesis and Interfacial Electron Transfer of a Composite Film of Graphene and Tungsten Oxide

LI Wen-Zhang2, LIU Yang2, LI Jie2, YANG Ya-Hui1, CHEN Qi-Yuan2   

  1. 1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, P. R. China;
    2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2014-05-15 Revised:2014-07-22 Published:2014-09-30
  • Contact: YANG Ya-Hui E-mail:Yangyahui2002@sina.com
  • Supported by:

    The project was supported by the National High Technology Research and Development Program of China (863) (2011AA050528), National Natural Science Foundation of China (21171175), and Hunan Provincial Natural Science Foundation, China (13JJ6003).

Abstract:

Composite films of graphene and tungsten oxide were fabricated by dip-coating with ammonium metatungstate as the precursor and polyvinylpyrrolidone as the bridging agent. The as-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. Photocurrent test, electrochemical impedance spectroscopy (EIS), transient photocurrent spectroscopy,and intensity-modulated photocurrent spectroscopy were used to study the transfer process and transport behavior of the charge carriers at the interface of the film electrodes. The results showed that the tungsten oxide nanoparticles were sufficiently composited with graphene. The efficiency of photoelectric conversion improved significantly. The transient constant and the electron-hole lifetime increased after the incorporation of graphene. The electron transit time of the composite film was reduced and was found to be only 47.5% of that of the tungsten oxide film.

Key words: Tungsten oxide, Graphene, Composite film, Photoelectrochemistry, Interfacial electron transfer

MSC2000: 

  • O644