物理化学学报 >> 2002, Vol. 18 >> Issue (02): 147-151.doi: 10.3866/PKU.WHXB20020211

研究论文 上一篇    下一篇

Pt和Sb、S吸附原子修饰的Pt电极上正丙醇氧化的CV和EQCM研究

陈国良;林珩;郑杏红;陈声培;孙世刚   

  1. 漳州师范学院化学系,漳州 363000;厦门大学化学系,固体表面物理化学国家重点实验室,厦门 361005
  • 收稿日期:2001-08-07 修回日期:2001-11-28 发布日期:2002-02-15
  • 通讯作者: 孙世刚 E-mail:sgsun@xmu.edu.cn

Oxidation of n-propyl Alcohol on Pt and Sb,S Modified Pt Electrodes Using CV & EQCM

Chen Guo-Liang;Lin Heng;Zheng Xing-Hong;Chen Sheng-Pei;Sun Shi-Gang   

  1. Department of Chemistry,Zhangzhou Normal College,Zhangzhou 363000;State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,Xiamen University,Xiamen 361005
  • Received:2001-08-07 Revised:2001-11-28 Published:2002-02-15
  • Contact: Sun Shi-Gang E-mail:sgsun@xmu.edu.cn

摘要: 运用电化学循环伏安法和石英晶体微天平研究了正丙醇在Pt电极和以Sb、S吸附原子修饰的Pt(Pt/Sbad和Pt/Sad)电极上的吸附和氧化过程.从电极表面质量变化角度指出正丙醇的氧化与电极表面氧物种有着极其密切的关系.Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高正丙醇电催化氧化活性,与在Pt电极上相比较,正丙醇氧化的峰电位负移了0.29 V,峰电流增加了近2倍.相反,Pt电极表面S吸附原子的氧化会消耗表面氧物种,饱和吸附S原子的Pt电极上正丙醇的电氧化受到抑制.本文从表面质量变化提供了吸附原子电催化作用的新数据.

关键词: 石英晶体微天平(EQCM), Pt电极, 修饰电极, 正丙醇, 循环伏安(CV)

Abstract: The adsorption and oxidation of n-propyl alcohol on Pt and Pt modified with saturated adsorped Sb and S (Pt/Sbad and Pt/Sad ) electrodes were studied using cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM).The results demonstrated that the oxidation of n-propyl alcohol depends strongly on the oxidation states of the electrode surface.Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials,and exhibit catalytic effects for n-propyl alcohol oxidation.In comparison with n-propyl alcohol oxidation at a Pt electrode,the oxidation peak potential of n-propyl alcohol on Pt surface modified with saturated Sbad was negatively shifted about 290 mV and the peak current was doubly increased.In contrary,the oxidation of S adatoms consumes oxygen species of Pt electrode surface.Consequently,the oxidation of n-propyl alcohol was inhibited on Pt surface modified with Sbad in saturation.The EQCM studies provided quantitative results of surface mass changes during n-propyl alcohol oxidation,and have thrown new light in elucidating different effects of adatoms Sbad and Sad on Pt electrode surface towards n-propyl alcohol oxidation.

Key words: Electrochemical quartz crystal microbalance(EQCM), Pt, Sbad, Sad, n-propyl alcohol, yclic voltammetry(CV)