吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和in situ FTIRS 研究

doi:10.61558/2993-074X.3357

电化学（中英文） ›› 2010, Vol. 16 ›› Issue (3): 285-289. doi: 10.61558/2993-074X.3357

吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和in situ FTIRS 研究

田莉;李君涛;叶进裕;甄春花;孙世刚;

厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,能源研究院;

收稿日期:2010-08-28 修回日期:2010-08-28 出版日期:2010-08-28 发布日期:2010-08-28

Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS

TIAN Li,LI Jun-tao,YE Jin-yu,ZHEN Chun-hua,SUN Shi-gang*

( State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry, College of Chemistry and Chemical Engineering,School of Energy Research,Xiamen University, Xiamen 361005,Fujian,China

Received:2010-08-28 Revised:2010-08-28 Published:2010-08-28 Online:2010-08-28

摘要/Abstract

摘要： 应用电化学原位傅里叶变换红外反射光谱(in situ FTIRS)研究了酸性介质中Pt(110)单晶电极上吸附态CO(COad)和溶液相CO(COsol)的氧化过程.循环伏安测试表明,COsol氧化的峰电位比COad氧化的正移了168mV,其峰电流密度为后者的6.7倍.电化学原位红外光谱检测到CO主要生成线型的吸附态物种(COL),均匀分布在Pt(110)表面上.当溶液中不存在CO时,COL仅在电位高于0.15V才发生氧化.而且,该谱峰在其稳定吸附的电位区间内随电位增加蓝移,Stark系数为30cm-1·V-1;在COL发生氧化的电位区间,其谱峰强度随电位增加减小、峰位红移,线性变化率为-56cm-1·V-1.溶液中饱和CO时,原位红外光谱在-0.05V即可检测到CO2的存在,显示COL起始氧化的电位提前了200mV;电位高于-0.05V,该谱峰即发生红移,对应的线性变化率为-26.5cm-1·V-1.

关键词: Pt(110)单晶电极, CO, 原位FTIR反射光谱

Abstract: The oxidation processes of adsorbed CO (COad) and solution phase CO (COsol) on Pt(110) electrode were investigated by cyclic voltammetry and in-situ FTIR spectroscopy. It has revealed that in comparison with COad on Pt(110) in a CO-free solution,the oxidation current peak of COsol in a CO-saturated solution is positively shifted ca. 168 mV,and the peak current density has been increased by 6. 70 times. Linear adsorbed CO (COL) is determined by in-situ FTIR spectroscopy as the main species,which is uniformly distributed on Pt (110) surface. In a CO-free solution,the onset potential of COL is measured by in-situ FTIRS ca. 0. 15 V; the COL band is blue-shifted with the increase of electrode potential in the potential range where COL is stable,yielding a Stark tuning rate 30 cm -1·V -1; when the COL is oxidized at E > 0. 15 V,the COL band is red-shifted at a rate of - 56 cm -1·V -1. In the case of CO-saturated solution,the CO2 band could be appeared in the in-situ FTIR spectrum recorded at - 0. 05 V,demonstrating that the onset potential of COL oxidation is negatively shifted ca. 200 mV in comparison with Pt( 110) in a CO-free solution; the COL band is immediately red-shifted with a rate of - 26. 5 cm -1·V -1 when the potential is above - 0. 05 V.

Key words: Pt(110) , CO, in situ FTIR spectroscopy

中图分类号:

O647.31

田莉, 李君涛, 叶进裕, 甄春花, 孙世刚, . 吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和in situ FTIRS 研究[J]. 电化学（中英文）, 2010, 16(3): 285-289.

TIAN Li, LI Jun-tao, YE Jin-yu, ZHEN Chun-hua, SUN Shi-gang . Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS[J]. Journal of Electrochemistry, 2010, 16(3): 285-289.

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https://electrochem.xmu.edu.cn/CN/Y2010/V16/I3/285

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吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和in situ FTIRS 研究

Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS

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