Citation: LI Wen-Zhang, LI Jie, WANG Xuan, ZHANG Shu-Juan, CHEN Qi-Yuan. Photoelectrochemical Properties of Cubic Tungsten Trioxide Films Obtained by the Polymeric Precursor Method[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2343-2348. doi: 10.3866/PKU.WHXB20100904 shu

Photoelectrochemical Properties of Cubic Tungsten Trioxide Films Obtained by the Polymeric Precursor Method

1.
1. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China;
2. Shenyang Aluminum and Magnesium Engineering and Research Institute, Shenyang 110001, P. R. China

Received Date: 9 March 2010
Available Online: 8 July 2010
Fund Project: 教育部新世纪优秀人才资助计划(NCET.05.0691) (NCET.05.0691)湖南省重大科技计划项目(2008SK1001)资助 (2008SK1001)

WO₃ films were prepared using ammonium metatungstate as the precursor and polyethylene glycol 1000 as the structure-directing agent by the polymeric precursor method. The obtained materials were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible (UV-Vis) spectrophotometry. The photoelectrochemical properties of the WO3 film electrodes were studied by cyclic voltammetry, Mott-Schottky, transient photocurrent spectra, and photocurrent-potential curve analysis. Results indicate that the films are crystalline with a cubic structure and they have bandgap energy of 2.7 eV. The flat band potential, donor carrier density, and photocurrent density of the sample calcined at 450 ℃ are 0.06 V, 2.44×10²² cm^-3 and 2.70 mA·cm^-2 under a 500W Xe lamp (I₀=100 mW·cm^-2), respectively. The effect of calcination temperature on the photoelectrochemical properties of the WO₃ films was investigated and the mechanismof charge separation for its behavior was also discussed.
- Cubic WO₃,
- Nano-structured film,
- Photoelectrochemistry,
- Polymeric precursor
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