物理化学学报 >> 1992, Vol. 8 >> Issue (01): 4-7.doi: 10.3866/PKU.WHXB19920102

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电化学调制时间分辨紫外可见光谱技术及其在电显色研究中的应用

傅志东; 林仲华; 罗瑾; 林祖赓; 田昭武   

  1. 厦门大学固体表面物理化学国家重点实验室，化学系，厦门 361005
  • 收稿日期:1991-08-02 修回日期:1991-09-28 发布日期:1992-02-15
  • 通讯作者: 傅志东

A New Electrochemically Modulated Time Resolved UV/VIS Spectroscopic(EMTRUV/VS) Technique and its Application in the Electrochromism of Popd Film

Fu Zhi-Dong; Lin Zhong-Hua; Luo Jin; Lin Zu-Geng; Tian Zhao-Wu   

  1. State Key Laboratory for Physical Chemistry of the Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:1991-08-02 Revised:1991-09-28 Published:1992-02-15
  • Contact: Fu Zhi-Dong

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关键词: 光谱电化学, 时间分辨紫外可见光谱法, 聚邻苯二胶

Abstract: A new electrochemically modulated time resolved uv/vis spectroscopic(EMTRUV/VS) technique based on optical multienannel analyzer (OMA) has been presented. EM-TRUV/VS measurement apparatus consists of five units: an optical signal detection unit which includes a detector, a polychromator, a detector module; an optics unit; a spe-ctroelectrochemical cell unit, which includes optical transparent electrode (OTE); an electrochemical control unit. The limit of time resolution can reach the order of ms by continuously scanning mode and the order of μs by gate mode which is suitable to reversible system with respect to a potential change, respectively. A high S/N ratio can be obtained by subtractive spectrum method. The electrochromism of a poly-o-phenylenediamine (POPD)-coated Au OTE in aqueous 1 mol·L~(-1) H_2SO_4 solution was studied by EMTRUV/VS technique. The optical absorption (λ_(max)=550 nm) of oxidized POPE is ascribed to n→π* transition. The time resolved spectra acquired suggest that the oxidation reaction of PDPD occurs during the first 500 μs and that the electrochromism is controled by H~+ transport.

Key words: Spectroeletrochemistry, Time resolved uv/vis spectroscopy, Poly-ophe-nylenediamine