高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (6): 841.

• 研究论文 • 上一篇    下一篇

阳极氧化膜WO3(Ⅱ)——电显色的介质效应

林仲华, 罗瑾, 黄福民, 蔡秀娟, 田昭武   

  1. 厦门大学化学系物理化学研究所, 厦门 361005
  • 收稿日期:1992-08-05 修回日期:1993-03-18 出版日期:1993-06-24 发布日期:1993-06-24
  • 通讯作者: 林仲华
  • 基金资助:

    国家自然科学基金

WO3 Anodic Oxide Film (Ⅱ)--Effect of Media on- Electrochromic Process

LiN Zhong-Hua, LUO Jin, HUANG Fu-Min, CAI Xiu-Juan, TIAN Zhao-Wu   

  1. Department of Chemistry, Institute of Physical Chemistry, Xiamen Univ, Xiamen, 361005
  • Received:1992-08-05 Revised:1993-03-18 Online:1993-06-24 Published:1993-06-24

摘要: 用循环计时电量法、循环伏安法、电化学现场(in-situ)紫外可见反射光谱技术和光电流谱技术研究了溶剂和阳离子(H+,Li+)对阳极氧化膜WO3电显色稳定性和过程的影响。从循环计时电量图可以测定表征膜稳定性的氢或锂的累积量和暂态周期数。实验发现W/WO3/LiCLO4乙腈溶液体系具有高的电显色稳定性。引起WO3膜可逆电显色的H+和Li+离子的嵌-脱过程的界面电化学机理不同。着色态WO3膜的色心是自由电子,其密度超过1021/cm3,生色机理是等离子体振荡。

关键词: 电显色, 三氧化钨膜, 电显色寿命, 循环计时电量法, 电反射光谱

Abstract: The effect of solvents and cations of H+ and Li+ on the- electrochromic stability and process at the WO3 anodic, oxide film were investigated by using cyclic chronocoulometry, cyclic voltamme-try, in situ UV/Vis reflectance spectroscopy and photocurrent spectroscopy.The parameters of hydrogen or lithium accumulation amount in the film and the number of the transient perods which can be determined from the Qt transient can be characteristic of the stability of the film, It can be found that the electrochromic system of W/WO3/LiClO4 solution in acetonilrile has a high stability.The in-terfacial electrochemical mechanism of the injection-extraction of Li ions in the electrochromic process is quite different from H+ ions.The color center for the anodic oxide film WO3 is considered to be the free electrons whose density is over 1021/cm3 and the optical transition, i.e, coloring process, arises from the plasma oscillation.

Key words: Electrochromism, Tungsten trioxide film, Electrochromic lifetime, Cyclic chronocoulome-try, Electroreflectance spectrum

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