物理化学学报 >> 2010, Vol. 26 >> Issue (09): 2343-2348.doi: 10.3866/PKU.WHXB20100904

电化学 上一篇    下一篇

聚合物前驱体法制备立方相WO3薄膜的光电化学性质

李文章1, 李洁1, 王旋1,2, 张姝娟1, 陈启元1   

  1. 1. 中南大学化学化工学院, 有色金属资源化学教育部重点实验室,长沙410083;
    2. 沈阳铝镁设计研究院,沈阳110001
  • 收稿日期:2010-03-09 修回日期:2010-04-28 发布日期:2010-09-02
  • 通讯作者: 李洁 E-mail:lijieliu@mail.csu.edu.cn
  • 基金资助:

    教育部新世纪优秀人才资助计划(NCET.05.0691)和湖南省重大科技计划项目(2008SK1001)资助

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

LI Wen-Zhang1, LI Jie1, WANG Xuan1,2, ZHANG Shu-Juan1, CHEN Qi-Yuan1   

  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:2010-03-09 Revised:2010-04-28 Published:2010-09-02
  • Contact: LI Jie E-mail:lijieliu@mail.csu.edu.cn
  • Supported by:

    The project was supported by the NewCentury Excellent Talents in University, China (NCET.05.0691) and Key Research Project in Science and Technology Programof Hunan Province, China (2008SK1001).

摘要:

以(NH4)6W7O24·6H2O 为钨源, 聚乙二醇1000 (PEG 1000)为配位聚合物, 采用聚合物前驱体法制备了WO3薄膜, 利用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外-可见(UV-Vis)吸收光谱等手段对其结构进行表征. 采用循环伏安法、Mott-Schottky 测试、瞬态光和稳态光电流谱等方法研究了WO3薄膜电极的光电化学性能.结果表明, 制备的WO3薄膜为立方晶系, 禁带宽度约为2.7 eV. 当热处理温度为450 ℃时, 载流子浓度达到最大2.44×1022 cm-3, 平带电位为0.06 V, 在500 W 氙灯光源照射和1.2 V偏压下, 光电流密度为2.70 mA·cm-2. 进一步探讨了热处理温度对其光电性质的影响及其机理.

关键词: 立方相WO3, 纳米薄膜, 光电化学, 聚合物前驱体

Abstract:

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.

Key words: Cubic WO3, Nano-structured film, Photoelectrochemistry, Polymeric precursor

MSC2000: 

  • O646