表面增强拉曼光谱研究吸附电位对CO在Pt电极上氧化行为的影响

doi:10.13208/j.electrochem.150309

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (4): 305-311. doi: 10.13208/j.electrochem.150309

• 研究论文 • 下一篇

表面增强拉曼光谱研究吸附电位对CO在Pt电极上氧化行为的影响

张普¹，卫怡¹，郑勇力¹，陈艳霞^1*，田中群²

1. 中国科技大学化学物理系合肥微尺度物质科学国家实验室（筹），安徽合肥 230026；2. 厦门大学化学化工学院固体表面物理国家重点实验室，福建厦门 361005

收稿日期:2015-03-09 修回日期:2015-05-05 出版日期:2015-08-28 发布日期:2015-08-28
通讯作者: 陈艳霞 E-mail:yachen@ustc.edu.cn
基金资助:
国家重大科学仪器设备开发专项（No. 2011YQ03012416）资助

Effect of Adsorption Potential on CO Oxidation at Au@Pt Nanoparticles Electrodes, A Surface Enhanced Raman Spectroscopic Study

ZHANG Pu¹, WEI Yi¹, ZHENG Yong-li¹, CHEN Yan-xia^1*, TIAN Zhong-qun²

1. Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China; 2. State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received:2015-03-09 Revised:2015-05-05 Published:2015-08-28 Online:2015-08-28
Contact: CHEN Yan-xia E-mail:yachen@ustc.edu.cn

摘要/Abstract

摘要： 预吸附电势对CO在Pt上的氧化行为有重要影响. 在电势低于0.3 V（vs. RHE）下，预吸附的CO单层在Pt电极上0.4 V就开始氧化，并会在0.6 V左右出现1个较小的氧化峰，即所谓的“氧化前峰”，而在双电层电位区间饱和吸附的CO只有当电势正于0.6 V才氧化

关键词: CO氧化, 氧化前峰, 表面增强拉曼

Abstract: The adsorption/oxidation of CO on the 55 nm Au@0.7 nm Pt nanoparticles electrode in both potentiodynamic and potentiostatic modes were investigated by surface enhanced Raman spectroscopy in a thin layer electrochemical flow cell under controlled mass transport, with the aim of clarifying the origin CO oxidation at lower electrode potentials (in current pre-wave region of corresponding cyclic voltammograms). Our results demonstrated that the CO oxidation kinetics differed significantly from the three kinds of different CO adsorption history, with almost no CO oxidation current in the pre-peak potential region after 0.35 V_RHE CO adsorption with or without subsequent holding the potential at 0.06 V_RHE for 30 min, compared to the significant CO oxidation current at lower potentials in both cyclic voltammograms and potentiostatic current transients after CO adsorption at 0.06 V_RHE. In contrast, at the same reaction potential in the pre-wave region both during linear potential sweep and potential step experiments, differences in Raman spectra of saturated CO adlayer with CO adsorption potential of 0.06 V_RHE and 0.35 V_RHE were negligible. Possible origins for the effect of pre-adsorption potential on CO oxidation kinetics are discussed.

Key words: CO oxidation, pre-peak, surface enhanced Raman spectroscopy

中图分类号:

O646

张普, 卫怡, 郑勇力, 陈艳霞, 田中群. 表面增强拉曼光谱研究吸附电位对CO在Pt电极上氧化行为的影响[J]. 电化学（中英文）, 2015, 21(4): 305-311.

ZHANG Pu, WEI Yi, ZHENG Yong-li, CHEN Yan-xia, TIAN Zhong-qun. Effect of Adsorption Potential on CO Oxidation at Au@Pt Nanoparticles Electrodes, A Surface Enhanced Raman Spectroscopic Study[J]. Journal of Electrochemistry, 2015, 21(4): 305-311.

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表面增强拉曼光谱研究吸附电位对CO在Pt电极上氧化行为的影响

Effect of Adsorption Potential on CO Oxidation at Au@Pt Nanoparticles Electrodes, A Surface Enhanced Raman Spectroscopic Study

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