高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (8): 863.

• 研究论文 • 上一篇    下一篇

用激光第二谐振光研究阴离子在多晶铜电极表面上的吸附

潘惠芳1, Bradley R. A.2, Rojhantalab H. M.2, Richmond G. L.2   

  1. 1. 石油大学应用化学系;
    2. 美国Oregon大学化学系
  • 收稿日期:1988-11-29 出版日期:1990-08-24 发布日期:1990-08-24
  • 通讯作者: 潘惠芳
  • 基金资助:

    美国国家科学基金(CHE8513008);美国石油研究基金(PRF-ACS16905)

Studies of Anionic Adsorption on the Surface of Polycrystalline Copper by Optical Second Harmonic Generation

Pan Huifang1, Bradley2, R. A.2, Rojhantalab H. M.2   

  1. 1. Department of Chemistry, University of Petroleum, Beijing;
    2. Department of Chemistry, The University of Oregon, USA
  • Received:1988-11-29 Online:1990-08-24 Published:1990-08-24

摘要: 首次用激光产生的第二谐振光(SHG)检测到金属/水溶液界面上阴离子在多晶铜电极表面上的吸附,阴离子吸附特性对SHG强度影响明显,由多晶铜电极在(0.5-x)mol/L NaClO4+xmol/LNaBr溶液中的SHG强度-电位曲线表明铜电极表面对ClO4-的吸附非常弱,对Br-有特定的吸附,SHG强度随Br-浓度增加而增强,结果表明SHG是定量研究电化学界面区吸附特性的灵敏有效的探针,可揭示金属与吸附质间相互作用的本质。

关键词: 晶体, 铜电极, 激光, 第二谐振光, 吸附离子

Abstract: Adsorption of anions on the surface of polycrystallirie copper of metal/aqueous solution interface was monitored with optical second harmonic generation (SHG). The SHGsignal is strongly affected by the anion adsorption on the surface. Excess charge density on the metal surface is concluded to be a major factor in the voltage-dependent production of the harmonic light. In this paper, the SHGintensity-voltage curves for polycfystalline copper in (0. 5 - x) mol/L NaClO4+x mol/L NaBr solutions for x in various values are presented. The results show that the perchlorate anion is quite weakly adsorbed at the surface and the halide ion is. a specific adsorption. The results demonstrate that the dominant feature in the voltage-dependent signal is a rise in harmonic light intensity with increasing halide ion concentration. In this case the metal-adsorbate interaction is a particularly clear manifest inthe SHG signal-voltage curves. The results of these studies show evidently that the SHG method Is aquite sensitive arid effective probe for monitoring adsorption quantitatively on the electrochemical interface.

Key words: Crystal, Copper electrode, Laser, Second harmonic generation, Adsorbed ions

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