物理化学学报 >> 2013, Vol. 29 >> Issue (11): 2399-2404.doi: 10.3866/PKU.WHXB201309061

电化学和新能源 上一篇    下一篇

ZnO/BiVO4-V2O5异质结构光生电荷性质及可见光下表面光电流行为

张宇, 林申, 张钰, 宋溪明   

  1. 辽宁大学化学院, 绿色合成与先进材料制备化学辽宁省重点实验室, 沈阳 110036
  • 收稿日期:2013-05-27 修回日期:2013-09-05 发布日期:2013-10-30
  • 通讯作者: 宋溪明 E-mail:songlab@lnu.edu.cn
  • 基金资助:

    国家自然科学基金(21203082,51273087,21071070);辽宁省教育厅自然科学基金(LT2011001);辽宁省科技厅自然科学基金(201102084)和辽宁大学青年基金(2011LDQN02)资助项目

Properties of Photogenerated Charge Carriers and Visible-Light Surface Photocurrent of Heterogeneous ZnO/BiVO4-V2O5 Structures

ZHANG Yu, LIN Shen, ZHANG Yu, SONG Xi-Ming   

  1. Liaoning Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, P. R. China
  • Received:2013-05-27 Revised:2013-09-05 Published:2013-10-30
  • Contact: SONG Xi-Ming E-mail:songlab@lnu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21203082, 51273087, 21071070), Natural Science Foundation of Liaoning Province (Educational Department), China (LT2011001), Natural Science Foundation of Liaoning Province (Science and Technology Department), China (201102084), and Foundation for Young Scholars of Liaoning University, China (2011LDQN02).

摘要:

利用水热法合成了花状和球状ZnO微纳材料,并与硝酸铋和偏钒酸铵溶液体系反应构筑了ZnO/BiVO4-V2O5复合体系.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线衍射(XRD)对材料进行了系统的表征.利用表面光伏(SPV)、表面光电流(SPC)和瞬态光伏(TPV)技术研究了ZnO/BiVO4-V2O5表面光生电荷的产生和传输机制.结果显示该复合材料在可见区产生了良好的光电响应,获得了较高的光生载流子的分离效率,光生电荷的寿命也同时增加.在单色弱可见光(波长500nm)照射下,复合材料产生良好重复性的表面光电流响应.

关键词: 异质结构, 表面光电流, 表面光伏, 瞬态光伏, 光生电荷

Abstract:

Spherical and flower-like ZnO micro/nanomaterials are synthesized through a hydrothermal method. ZnO/BiVO4-V2O5 composite structures are then prepared in a solution containing Bi(NO3)3 and NH4VO3.The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopic (TEM), and X-ray diffraction (XRD). Surface photovoltage (SPV), surface photocurrent (SPC), and transient photovoltage (TPV) techniques were used to investigate the generation and transport mechanisms of the photogenerated charge carriers in the heterogeneous ZnO/BiVO4-V2O5 structure. The composite materials show good photoelectric response to visible light. Highly efficient separation of photogenerated charge carriers is observed, and the so-formed charge carriers are long lived. Measurements of surface photocurrent by comb-like electrode were performed on the ZnO/BiVO4-V2O5 system. Under irradiation by weak monochromatic light (wavelength: 500 nm), the ZnO/BiVO4-V2O5composite materials generate surface photocurrent responses with good reproducibility.

Key words: Heterogeneous structure, Surface photocurrent, Surface photovoltage, Transient photovoltage, Photogenerated charge

MSC2000: 

  • O649