Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (02): 147-151.doi: 10.3866/PKU.WHXB20020211

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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

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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)