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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (20): 2302-2304. 上一篇    下一篇

研究简报

Ru膜上Pt层的自发沉积及其在电化学表面增强红外光谱中的应用

李巧霞a， 王金意a ，徐群杰b， 蔡文斌*,a

  

  1. (a复旦大学化学系 ，上海 ，200433;)
    (b上海电力学院环境工程系 ，上海 ，200090)

  • 投稿日期:2008-05-05 修回日期:2008-05-30 发布日期:2008-10-28
  • 通讯作者: 蔡文斌

Spontaneous Deposition of Pt Overlayer on Ru Film and iIts Application in Electrochemical Surface-enhanced IR Absorption Spectroscopy

LiI, Qiao-Xia a , WangANG, Jin-Yi a , XuU, Qun-Jie b, Cai, Wen-Bin *,a   

  1. (a Department of Chemistry, Fudan University, Shanghai 200433;)
    (b Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai, 200090)
  • Received:2008-05-05 Revised:2008-05-30 Published:2008-10-28
  • Contact: Cai, Wen-Bin

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被引次数

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采用自发沉积法在Ru膜上生成超薄Pt层(简称Ru/Pt膜), 即在开路状态下将电化学还原后的Ru膜浸于除去氧的H2PtCl6溶液中进行自发沉积. 电化学伏安法测量表明, 随着电还原-自发沉积循环次数的增加, 该Ru/Pt膜电极所含Pt组分增加, 且CO吸附层的电氧化峰电位较Pt膜电极上的明显负移. 应用现场衰减全反射表面增强红外光谱法(ATR-SEIRAS)可轻易检测到在该膜电极Pt和Ru位上吸附CO的振动谱峰. 所制Ru/Pt膜电极不仅对CO的电催化氧化具有协同效应, 还可应用于现场ATR-SEIRAS的研究中.

关键词: Ru基Pt层电极, 自发沉积法, 电催化, CO, 衰减全反射表面增强红外光谱

A spontaneous deposition approach was developed to form a Pt ultrathin overlayer onto a Ru nanoparticle film (simplified hereafter as Ru/Pt film) in which the freshly electroreduced Ru film wereas subsequently immersed in a deaerated H2PtCl6 solution without potential control. Voltammetric measurements indicated that Pt content increased with the number of the reduction-immersion cycles, and CO adlayer could be electro-oxidized at a much lower potential on the Ru/Pt film electrode than on a Pt film electrode. With in situ attenuated-total-reflection surface-enhanced IR absorption spectroscopy (ATR-SEIRAS), CO molecules adsorbed on both Pt and Ru sites of the Ru/Pt film electrode could be easily identified. In addition to a synergetic effect towards the electrocatalytic oxidation of CO, this as-deposited Ru/Pt film can be applicable to in situ ATR-SEIRAS measurements.

Key words: Pt-on-Ru electrode, spontaneous deposition, electrocatalysis, CO, ATR-SEIRAS