高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 373.

• Chemistry in Surface Science • 上一篇    下一篇

Electrocatalytic Oxidation of HCOOH on Pt(331)/Sb Electrode

YANG Yi-Yun, ZHOU Zhi-You, GU Yan-Juan, CHEN Sheng-Pei, SUN Shi-Gang   

  1. Department of Chemistry, State key lab for physical chemistry of solid surfaces, Xiamen University, Xiamen 361005
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 通讯作者: SUN Shi-Gang E-mail:sgsun@xmu.edu.cn
  • 基金资助:

    Project supported by natural science foundation of China (29973035) and Education Ministry of China (1999038403).

Electrocatalytic Oxidation of HCOOH on Pt(331)/Sb Electrode

YANG Yi-Yun, ZHOU Zhi-You, GU Yan-Juan, CHEN Sheng-Pei, SUN Shi-Gang   

  1. Department of Chemistry, State key lab for physical chemistry of solid surfaces, Xiamen University, Xiamen 361005
  • Online:2000-12-31 Published:2000-12-31
  • Contact: SUN Shi-Gang E-mail:sgsun@xmu.edu.cn
  • Supported by:

    Project supported by natural science foundation of China (29973035) and Education Ministry of China (1999038403).

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摘要：

Single crystal planes provide surface models of well defined atomic arrangement. Using the method of UPD and irreversibly adsorption (IRA) to modify electrode with adatoms can change the composition,the symmetry of atomic arrangement and the electronic structure of electrode surface[1]. We have studied in this paper the electrochemical behavior of irreversibly adsorbed antimony on Pt(331) (Pt(331)/Sb) and HCOOH oxidation on R(331)/Sb. The result demonstrated that the IRD Sb adatoms on Pt (331) was stable at potentials below 0.30 V (SCE). We illustrated that various coverage of Sbad can be easily obtained by controlling the number of potential cycling and the upper limit of potential scan (Eu). The coadsorption of Sb with H on Pt(331) surface was characterized by relation between the coverage of Sb (θSb) and that of Had (θH). Two domains were determined:(1) when θSb is small than 0.10, dramatic decrease of θH with θSb is manifested, meaning that hydrogen adsorption can be inhibited significantly by a small quantity of Sbad; (2) when θSb is large than 0.10, θH maintains almost a constant value near 0.025.

Abstract:

Single crystal planes provide surface models of well defined atomic arrangement. Using the method of UPD and irreversibly adsorption (IRA) to modify electrode with adatoms can change the composition,the symmetry of atomic arrangement and the electronic structure of electrode surface[1]. We have studied in this paper the electrochemical behavior of irreversibly adsorbed antimony on Pt(331) (Pt(331)/Sb) and HCOOH oxidation on R(331)/Sb. The result demonstrated that the IRD Sb adatoms on Pt (331) was stable at potentials below 0.30 V (SCE). We illustrated that various coverage of Sbad can be easily obtained by controlling the number of potential cycling and the upper limit of potential scan (Eu). The coadsorption of Sb with H on Pt(331) surface was characterized by relation between the coverage of Sb (θSb) and that of Had (θH). Two domains were determined:(1) when θSb is small than 0.10, dramatic decrease of θH with θSb is manifested, meaning that hydrogen adsorption can be inhibited significantly by a small quantity of Sbad; (2) when θSb is large than 0.10, θH maintains almost a constant value near 0.025.

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