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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insituFTIRS研究; Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS
田莉 ; 李君涛 ; 叶进裕 ; 甄春花 ; 孙世刚
2010
关键词Pt(110)单晶电极 CO 原位FTIR反射光谱 Pt(110) CO in situ FTIR spectroscopy
英文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.; 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.; 国家自然科学基金项目(20833005;20828005;20921120405)资助
语种zh_CN
内容类型期刊论文
源URL[http://dspace.xmu.edu.cn/handle/2288/106413]  
专题化学化工-已发表论文
推荐引用方式
GB/T 7714
田莉,李君涛,叶进裕,等. 吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和insituFTIRS研究, Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS[J],2010.
APA 田莉,李君涛,叶进裕,甄春花,&孙世刚.(2010).吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和insituFTIRS研究..
MLA 田莉,et al."吸附态和溶液相CO在Pt(110)电极上氧化过程的CV和insituFTIRS研究".(2010).
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