欢迎访问《电化学(中英文)》期刊官方网站,今天是

电化学(中英文) ›› 2010, Vol. 16 ›› Issue (3): 279-284.  doi: 10.61558/2993-074X.3356

• 研究论文 • 上一篇    下一篇

一氧化碳在钯薄膜修饰的金电极上的电氧化-厚度的影响(英文)

Yuqing Yang,Shouzhong Zou*   

  1. 美国迈阿密大学化学与生化系;
  • 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

Electrooxidation of Carbon Monoxide on Pd Thin Film-Coated Au Electrodes:Film Thickness Dependence

Yuqing Yang,Shouzhong Zou*   

  1. ( Department of Chemistry and Biochemistry,Miami University,Oxford,OH 45056,USA
  • Received:2010-08-28 Revised:2010-08-28 Published:2010-08-28 Online:2010-08-28

摘要: 采用扫描循环伏安法及表面增强拉曼散射光谱研究了一氧化碳(CO)在钯修饰金电极上的吸附与氧化.结果表明CO氧化电位随钯膜厚度增加而正移,同时C—O伸缩振动频率红移.本文利用d能带理论解释观察现象.应力效应使CO吸附变强,难以氧化;但配体效应使CO吸附变弱,易于氧化.在薄膜中配体效应强于应力效应.

关键词: CO电氧化, Pd薄膜, d能带理论, 表面增强拉曼散射

Abstract: The adsorption and electrooxidation of CO on Pd-coated Au electrodes were studied by cyclic voltammetry and surface-enhanced Raman spectroscopy (SERS) . It is found that CO oxidation activity is film thickness dependent. Cyclic voltammograms (CVs) showed that CO oxidation peak potential shifted positively with the increase of the Pd thickness. SERS showed a redshift of the C—O stretching frequency with increasing Pd film thickness. These observations were explained by the dband theory. The strain effect strengthens CO adsorption and stabilizes adsorbed CO,while the ligand effect weakens CO adsorption and eases its oxidation. The ligand effect overpowers the strain effect.

Key words: CO oxidation, Pd thin film, d-band theory, SERS

中图分类号: